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EDITORIALS AND ANNOUNCEMENTS

Editorial: Introducing the Collection on Photovoltaic Energy Conversion

Shanhui Fan and Zetian Mi

Phys. Rev. Applied 16, 040001 (2021) - Published 15 October, 2021

Guest Editors Shanhui Fan and Zetian Mi introduce a collection of papers in Physical Review Applied on photovoltaic energy conversion, a subject of ever-increasing importance.

HIGHLIGHTED ARTICLES

Quantum Communication over Atmospheric Channels: A Framework for Optimizing Wavelength and Filtering

R. Nicholas Lanning, Mark A. Harris, Denis W. Oesch, Michael D. Oliker, and Mark T. Gruneisen

Phys. Rev. Applied 16, 044027 (2021) - Published 18 October, 2021

The wavelength dependence of the daytime performance of free-space quantum channels is crucial to global-scale quantum networking, but has been relatively unexplored, due to a lack of expertise in atmospheric physics among quantum optics researchers. This study makes progress by simulating quantum key distribution at different wavelengths, under daytime spectral radiance and atmospheric turbulence. Even in the face of multiple unfavorable factors, it is found that shorter wavelengths can nonetheless outperform longer ones. The framework and insights of this study are expected to have strong impact, and to serve as stepping stones for analyzing more complex quantum networking protocols.

Superradiant Many-Qubit Absorption Refrigerator

Michal Kloc, Kurt Meier, Kimon Hadjikyriakos, and Gernot Schaller

Phys. Rev. Applied 16, 044061 (2021) - Published 29 October, 2021

Cooling fragile quantum systems requires quantum cooling technology. The smallest possible fridge employs a three-level system to autonomously cool the coldest of the three reservoirs. The authors suggest a setup with a quantum working fluid composed of N collectively coupled qubits to effectively implement such a refrigerator. The collective couplings lead to a quadratic boost of the cooling current, IN2.

Going Beyond the Causal Limit in Acoustic Absorption

Ho Yiu Mak, Xiaonan Zhang, Zhen Dong, Susumu Miura, Takuro Iwata, and Ping Sheng

Phys. Rev. Applied 16, 044062 (2021) - Published 29 October, 2021

Does Nature take something away with one hand and give it back with the other? Yes, in the case of acoustic absorption. The causality principle has been regarded as the reason one needs thick, bulky absorbers for low-frequency noise remediation. By judicious manipulation of the boundary condition on the backside of the absorber, the authors obtain broadband near-total absorption below 100 Hz with a 2-cm-thick sample, when the causal minimum is 15 cm. This complements metamaterial absorbers that are within the causal limit and effective at higher frequencies, yielding a holistic picture of the acoustic absorber design landscape, over the entire frequency range.

Optical Brewster Metasurfaces Exhibiting Ultrabroadband Reflectionless Absorption and Extreme Angular Asymmetry

Huiying Fan, Jensen Li, Yun Lai, and Jie Luo

Phys. Rev. Applied 16, 044064 (2021) - Published 29 October, 2021

Ultrabroadband reflectionless absorption of light is in great demand for many applications. This study proposes a type of nonresonant, impedance-matched optical metasurface that exhibits ultrabroadband reflectionless absorption, based on the anomalous Brewster effect. Extremely asymmetric behavior—a transition from perfect transparency to perfect absorption—appears when the sign of the angle of incidence changes, due to the coexistence of the traditional and anomalous Brewster effects. Such high-efficiency metasurfaces may find application in optoelectronic and thermal devices such as photovoltaics, photodetectors, and thermal emitters.

LETTERS

Spin-Injection Enhancements in van der Waals Magnetic Tunnel Junctions through Barrier Engineering

Jonathan J. Heath and Marcelo A. Kuroda

Phys. Rev. Applied 16, L041001 (2021) - Published 15 October, 2021

Magnetic tunnel junctions (MTJs) composed of different two-dimensional (2D) materials are promising for spin-valve applications. However, as the number of material combinations grows, guiding principles for heterostructure composition-property relationships become very desirable. The authors use first-principles calculations to provide design guidelines for spin-dependent transport in MTJs, based on the bulk properties of the constituent 2D materials, and find that low-work-function electrodes enable greater performance with CrI3 channels. This data-driven scheme offers a fast, systematic method to accelerate the design of spintronic devices based on 2D materials.

Thermal-Wave Diode

Jose Ordonez-Miranda, Yangyu Guo, Juan J. Alvarado-Gil, Sebastian Volz, and Masahiro Nomura

Phys. Rev. Applied 16, L041002 (2021) - Published 28 October, 2021

The operation of thermal diodes is typically limited to narrow temperature ranges and low rectification of steady-state heat currents. Despite their key application in thermal computing, and the analogy to their electronic counterparts, the development of thermal diodes operating with modulated heat currents has not received much attention. Based on the spatiotemporal modulation of a material’s thermal conductivity and volumetric heat capacity, the authors give proof of principle of a thermal diode that can rectify the modulated heat current of thermal waves. Rectification factors higher than 86% are obtained as the modulation frequencies driving the propagation of thermal waves decrease.

Estimating the Spatial Orientation of Immobilized Magnetic Nanoparticles with Parallel-Aligned Easy Axes

Martin Möddel, Florian Griese, Tobias Kluth, and Tobias Knopp

Phys. Rev. Applied 16, L041003 (2021) - Published 28 October, 2021

Magnetic nanoparticles are of great interest for a variety of applications, ranging from medical diagnosis and treatment to information storage and genetic engineering. Their key property is that their magnetization can be manipulated with external magnetic fields. Here researchers study the influence of the spatial orientation of an ensemble of immobilized nanoparticles, with magnetic easy axes aligned parallel with respect to a dynamic external magnetic excitation field, on the magnetization response of the nanoparticles. The authors present a method and experimental proof of concept for estimating the spatial orientation of the easy axis from the magnetization response.

ARTICLES

Terahertz Sources Based on Emission from a GaAs/(Al,Ga)As Heterostructure at Cryogenic Temperatures

D. Yavorskiy, M. Szoła, T. Tarkowski, J. Wróbel, P. Nowicki, V. Umansky, W. Knap, and J. Łusakowski

Phys. Rev. Applied 16, 044001 (2021) - Published 1 October, 2021

Seismic Metashielding by a Line of Resonators Over a Granular Layer

Pierric Mora, Mathieu Chekroun, and Vincent Tournat

Phys. Rev. Applied 16, 044002 (2021) - Published 4 October, 2021

Tuning the Band Alignment and Electronic Properties of GaSe/SnX2 (X = S, Se) Two-Dimensional van der Waals Heterojunctions via an Electric Field

Bo Sun, Yu-Feng Ding, Peng-Bin He, Yu-Qing Zhao, and Meng-Qiu Cai

Phys. Rev. Applied 16, 044003 (2021) - Published 4 October, 2021

Ultrafast Holonomic Quantum Gates

Pu Shen, Tao Chen, and Zheng-Yuan Xue

Phys. Rev. Applied 16, 044004 (2021) - Published 5 October, 2021

Dynamically Corrected Nonadiabatic Holonomic Quantum Gates

Sai Li and Zheng-Yuan Xue

Phys. Rev. Applied 16, 044005 (2021) - Published 5 October, 2021

Wave Steering by Relaying Interface States in a Valley-Hall-Derived Photonic Superlattice

Hongchen Chu, Ze-Guo Chen, Yun Lai, and Guancong Ma

Phys. Rev. Applied 16, 044006 (2021) - Published 6 October, 2021

Phonon-Laser Ultrasensitive Force Sensor

Zhichao Liu, Yaqi Wei, Liang Chen, Ji Li, Shuangqing Dai, Fei Zhou, and Mang Feng

Phys. Rev. Applied 16, 044007 (2021) - Published 7 October, 2021

Topological Surface Acoustic Waves

Zi-Dong Zhang, Si-Yuan Yu, Hao Ge, Ji-Qian Wang, Hong-Fei Wang, Kang-Fu Liu, Tao Wu, Cheng He, Ming-Hui Lu, and Yan-Feng Chen

Phys. Rev. Applied 16, 044008 (2021) - Published 7 October, 2021

Origin of Enhanced Electromechanical Coupling in (Yb,Al)N Nitride Alloys

Junjun Jia and Takahiko Yanagitani

Phys. Rev. Applied 16, 044009 (2021) - Published 8 October, 2021

Subwavelength Metawaveguide Filters and Metaports

Maliheh Khatibi Moghaddam and Romain Fleury

Phys. Rev. Applied 16, 044010 (2021) - Published 8 October, 2021

Chiral Topological Surface States on a Finite Square Photonic Crystal Bounded by Air

Anna C. Tasolamprou, Maria Kafesaki, Costas M. Soukoulis, Eleftherios N. Economou, and Thomas Koschny

Phys. Rev. Applied 16, 044011 (2021) - Published 11 October, 2021

Ultracompact Binary Permanent Rare-Earth Magnet with 1.25-T Center Field and Fast-Decaying Stray Field

Jean-Marie Poumirol, Adrien Bercher, Tetiana Slipchenko, Ivan Maggio-Aprile, Christoph Renner, and Alexey B. Kuzmenko

Phys. Rev. Applied 16, 044012 (2021) - Published 11 October, 2021

Positive-Negative Ghost Imaging with Statistics of Realizations

Ling-Yu Dou, Li-Qing Ren, De-Zhong Cao, and Xin-Bing Song

Phys. Rev. Applied 16, 044013 (2021) - Published 11 October, 2021

Skyrmion States in Disk Geometry

Thomas Brian Winkler, Kai Litzius, Andrea de Lucia, Markus Weißenhofer, Hans Fangohr, and Mathias Kläui

Phys. Rev. Applied 16, 044014 (2021) - Published 11 October, 2021

Electrical Properties of Selective-Area-Grown Superconductor-Semiconductor Hybrid Structures on Silicon

A. Hertel, L.O. Andersen, D.M.T. van Zanten, M. Eichinger, P. Scarlino, S. Yadav, J. Karthik, S. Gronin, G.C. Gardner, M.J. Manfra, C.M. Marcus, and K.D. Petersson

Phys. Rev. Applied 16, 044015 (2021) - Published 12 October, 2021

Microcavity Sensor Enhanced by Spontaneous Chiral Symmetry Breaking

Yi-Yi Li, Qi-Tao Cao, Jin-hui Chen, Xiao-Chong Yu, and Yun-Feng Xiao

Phys. Rev. Applied 16, 044016 (2021) - Published 12 October, 2021

Linear and Nonlinear Properties of a Compact High-Kinetic-Inductance WSi Multimode Resonator

Naftali Kirsh, Elisha Svetitsky, Samuel Goldstein, Guy Pardo, Ori Hachmo, and Nadav Katz

Phys. Rev. Applied 16, 044017 (2021) - Published 12 October, 2021

Carrier-Suppressed Multiple-Single-Sideband Laser Source for Atom Cooling and Interferometry

S. Templier, J. Hauden, P. Cheiney, F. Napolitano, H. Porte, P. Bouyer, B. Barrett, and B. Battelier

Phys. Rev. Applied 16, 044018 (2021) - Published 12 October, 2021

Beyond Conservation of Orbital Angular Momentum in Stimulated Parametric Down-Conversion

A.G. de Oliveira, G. Santos, N. Rubiano da Silva, L.J. Pereira, G.B. Alves, A.Z. Khoury, and P.H. Souto Ribeiro

Phys. Rev. Applied 16, 044019 (2021) - Published 13 October, 2021

Machine-Learning-Assisted Acoustic Consecutive Fano Resonances: Application to a Tunable Broadband Low-Frequency Metasilencer

Zi-xiang Xu, Bin Zheng, Jing Yang, Bin Liang, and Jian-chun Cheng

Phys. Rev. Applied 16, 044020 (2021) - Published 13 October, 2021

Escalated Deep-Subwavelength Acoustic Imaging with Field Enhancement Inside a Metalens

Jian Chen, Zeqing Sun, Jing Rao, Danylo Lisevych, and Zheng Fan

Phys. Rev. Applied 16, 044021 (2021) - Published 13 October, 2021

Promising Properties of a Sub-5-nm Monolayer MoSi2N4 Transistor

Junsheng Huang, Ping Li, Xiaoxiong Ren, and Zhi-Xin Guo

Phys. Rev. Applied 16, 044022 (2021) - Published 13 October, 2021

Nonequilibrium Green’s Function Modeling of Trap-Assisted Tunneling in InxGa1xN/GaN Light-Emitting Diodes

Jesus Alberto Gonzalez Montoya, Alberto Tibaldi, Carlo De Santi, Matteo Meneghini, Michele Goano, and Francesco Bertazzi

Phys. Rev. Applied 16, 044023 (2021) - Published 14 October, 2021

Modeling Infrared Superlattice Photodetectors: From Nonequilibrium Green’s Functions to Quantum-Corrected Drift Diffusion

Alberto Tibaldi, Jesus Alberto Gonzalez Montoya, Marco Vallone, Michele Goano, Enrico Bellotti, and Francesco Bertazzi

Phys. Rev. Applied 16, 044024 (2021) - Published 14 October, 2021

Control Design for Inhomogeneous-Broadening Compensation in Single-Photon Transducers

Sattwik Deb Mishra, Rahul Trivedi, Amir H. Safavi-Naeini, and Jelena Vučković

Phys. Rev. Applied 16, 044025 (2021) - Published 14 October, 2021

Influence of Disorder and State Filling on Charge-Transfer-State Absorption and Emission Spectra

Saeed-Uz-Zaman Khan and Barry P. Rand

Phys. Rev. Applied 16, 044026 (2021) - Published 15 October, 2021

Characterizing the energetic disorder of the charge-transfer (CT) state is crucial to understanding organic photovoltaic devices, but is complicated by the discrepancy between temperature-dependent absorption and emission spectra. The authors show that, unlike absorption measurements, electroluminescence measurements do not reveal the full extent of the CT-state distribution at low temperatures. In a highly disordered blend, CT-state filling is incomplete, and injected carriers do not reach equilibrium sites before recombining. CT disorder can be reliably found from temperature-dependent measurements of external quantum efficiency, which can distinguish dynamic from static disorder.

Quantum Communication over Atmospheric Channels: A Framework for Optimizing Wavelength and Filtering

R. Nicholas Lanning, Mark A. Harris, Denis W. Oesch, Michael D. Oliker, and Mark T. Gruneisen

Phys. Rev. Applied 16, 044027 (2021) - Published 18 October, 2021

The wavelength dependence of the daytime performance of free-space quantum channels is crucial to global-scale quantum networking, but has been relatively unexplored, due to a lack of expertise in atmospheric physics among quantum optics researchers. This study makes progress by simulating quantum key distribution at different wavelengths, under daytime spectral radiance and atmospheric turbulence. Even in the face of multiple unfavorable factors, it is found that shorter wavelengths can nonetheless outperform longer ones. The framework and insights of this study are expected to have strong impact, and to serve as stepping stones for analyzing more complex quantum networking protocols.

Shortcuts to Adiabaticity for Open Quantum Systems and a Mixed-State Inverse Engineering Scheme

S.L. Wu, W. Ma, X.L. Huang, and Xuexi Yi

Phys. Rev. Applied 16, 044028 (2021) - Published 18 October, 2021

Multifunctional Waterborne Acoustic Metagratings: From Extraordinary Transmission to Total and Abnormal Reflection

Lijuan Fan and Jun Mei

Phys. Rev. Applied 16, 044029 (2021) - Published 18 October, 2021

Mapping Charge Recombination and the Effect of Point-Defect Insertion in GaAs Nanowire Heterojunctions

Brian T. Zutter, Hyunseok Kim, William A. Hubbard, Dingkun Ren, Matthew Mecklenburg, Diana Huffaker, and B.C. Regan

Phys. Rev. Applied 16, 044030 (2021) - Published 18 October, 2021

Quantum Enhanced Precision Estimation of Transmission with Bright Squeezed Light

G.S. Atkinson, E.J. Allen, G. Ferranti, A.R. McMillan, and J.C.F. Matthews

Phys. Rev. Applied 16, 044031 (2021) - Published 19 October, 2021

Revealing the Boundary Weyl Physics of the Four-Dimensional Hall Effect via Phason Engineering in Metamaterials

Wenting Cheng, Emil Prodan, and Camelia Prodan

Phys. Rev. Applied 16, 044032 (2021) - Published 19 October, 2021

Acousto-Optical Volumetric Sensing of Acoustic Fields

Samuel A. Verburg and Efren Fernandez-Grande

Phys. Rev. Applied 16, 044033 (2021) - Published 19 October, 2021

Optically Induced Sieve Effect for Nanoparticles near a Nanofiber Taper

Mark Sadgrove, Takaaki Yoshino, Masakazu Sugawara, Yasuyoshi Mitsumori, and Keiichi Edamatsu

Phys. Rev. Applied 16, 044034 (2021) - Published 20 October, 2021

Electric Field Control of the Skyrmion Hall Effect in Piezoelectric-Magnetic Devices

Mouad Fattouhi, Felipe García-Sánchez, Rocío Yanes, Víctor Raposo, Eduardo Martínez, and Luis Lopez-Diaz

Phys. Rev. Applied 16, 044035 (2021) - Published 20 October, 2021

Stabilization of Qubit Relaxation Rates by Frequency Modulation

Shlomi Matityahu, Alexander Shnirman, and Moshe Schechter

Phys. Rev. Applied 16, 044036 (2021) - Published 20 October, 2021

Enhanced Magnetoresistance under Bias Voltage in Fe/MgO/MgAl2O4/MgO/Fe Trilayer Tunneling Barrier Junction

Kenji Nawa, Keisuke Masuda, and Yoshio Miura

Phys. Rev. Applied 16, 044037 (2021) - Published 20 October, 2021

Near-Infrared Quantum Cascade Lasers Designed with van der Waals Materials

Hai-Yao Deng

Phys. Rev. Applied 16, 044038 (2021) - Published 21 October, 2021

Markovian Quantum Neuroevolution for Machine Learning

Zhide Lu, Pei-Xin Shen, and Dong-Ling Deng

Phys. Rev. Applied 16, 044039 (2021) - Published 21 October, 2021

Variational Self-Consistent Theory for Beam-Loaded Cavities

Adham Naji and Sami Tantawi

Phys. Rev. Applied 16, 044040 (2021) - Published 21 October, 2021

Environmental Sensitivity of Fabry-Perot Microcavities Induced by Layered Graphene-Dielectric Hybrid Coatings

Rui Peixoto, J.P. Santos Pires, Catarina S. Monteiro, Maria Raposo, Paulo A. Ribeiro, Susana O. Silva, Orlando Frazão, and J.M. Viana Parente Lopes

Phys. Rev. Applied 16, 044041 (2021) - Published 22 October, 2021

Quantum Computer-Aided Design: Digital Quantum Simulation of Quantum Processors

Thi Ha Kyaw, Tim Menke, Sukin Sim, Abhinav Anand, Nicolas P.D. Sawaya, William D. Oliver, Gian Giacomo Guerreschi, and Alán Aspuru-Guzik

Phys. Rev. Applied 16, 044042 (2021) - Published 22 October, 2021

Giant Enhancement of Excitonic Electro-optic Response in Trap-Reduced Organic Transistors

Satoshi Matsuoka, Jun'ya Tsutsumi, and Tatsuo Hasegawa

Phys. Rev. Applied 16, 044043 (2021) - Published 22 October, 2021

Acoustically Driven Sorption Heat Pump

Ariel Vardi-Chouchana and Guy Z. Ramon

Phys. Rev. Applied 16, 044044 (2021) - Published 25 October, 2021

Robust Strong-Coupling Architecture in Circuit Quantum Electrodynamics

Rishabh Upadhyay, George Thomas, Yu-Cheng Chang, Dmitry S. Golubev, Andrew Guthrie, Azat Gubaydullin, Joonas T. Peltonen, and Jukka P. Pekola

Phys. Rev. Applied 16, 044045 (2021) - Published 25 October, 2021

Carrier Localization by a Quantum Dot in a Quantum Well

A.N. Kosarev and V.V. Chaldyshev

Phys. Rev. Applied 16, 044046 (2021) - Published 25 October, 2021

Origin of the Repulsive Casimir Force in Giant Polarization-Interconversion Materials

Zhou Li and Chinmay Khandekar

Phys. Rev. Applied 16, 044047 (2021) - Published 25 October, 2021

Interface Effects Induced by a ZrO2 Seed Layer on the Phase Stability and Orientation of HfO2 Ferroelectric Thin Films: A First-Principles Study

Can Huang, Yuke Zhang, Shuaizhi Zheng, Qiong Yang, and Min Liao

Phys. Rev. Applied 16, 044048 (2021) - Published 26 October, 2021

High Conductance Margin for Efficient Neuromorphic Computing Enabled by Stacking Nonvolatile van der Waals Transistors

Liping Xu (徐丽萍), Hao Xiong (熊浩), Zhichao Fu (付志超), Menghan Deng (邓梦晗), Shuiyuan Wang (王水源), Jinzhong Zhang (张金中), Liyan Shang (商丽燕), Kai Jiang (姜凯), Yawei Li (李亚巍), Liangqing Zhu (朱亮清), Liang He, Zhigao Hu (胡志高), and Junhao Chu (褚君浩)

Phys. Rev. Applied 16, 044049 (2021) - Published 26 October, 2021

Compliance-Current Manipulation of Dual-Filament Switching in a Ta/Ta2O5/InSnO Structure with an Ultralow Power Consumption

Binbin Liu, Ke Chang, Xinna Yu, Yiru Niu, Xinyuan Dong, and Hui Wang

Phys. Rev. Applied 16, 044050 (2021) - Published 26 October, 2021

Fast Coherent Control of a Nitrogen-Vacancy-Center Spin Ensemble Using a KTaO3 Dielectric Resonator at Cryogenic Temperatures

Hyma H. Vallabhapurapu, James P. Slack-Smith, Vikas K. Sewani, Chris Adambukulam, Andrea Morello, Jarryd J. Pla, and Arne Laucht

Phys. Rev. Applied 16, 044051 (2021) - Published 26 October, 2021

Meniscus Oscillations Driven by Flow Focusing Lead to Bubble Pinch-Off and Entrainment in a Piezoacoustic Inkjet Nozzle

Arjan Fraters, Maaike Rump, Roger Jeurissen, Marc van den Berg, Youri de Loore, Hans Reinten, Herman Wijshoff, Devaraj van der Meer, Detlef Lohse, Michel Versluis, and Tim Segers

Phys. Rev. Applied 16, 044052 (2021) - Published 27 October, 2021

Effect of Surface Ionic Screening on Polarization Reversal and Phase Diagrams in Thin Antiferroelectric Films for Information and Energy Storage

Anna N. Morozovska, Eugene A. Eliseev, Arpan Biswas, Nicholas V. Morozovsky, and Sergei V. Kalinin

Phys. Rev. Applied 16, 044053 (2021) - Published 27 October, 2021

Sub-Diffraction-Limit Imaging System with two Interfacing Hyperbolic Metamaterials

Kirill Bronnikov, Jesús Arriaga, Arkadii Krokhin, and Vladimir P. Drachev

Phys. Rev. Applied 16, 044054 (2021) - Published 27 October, 2021

Detection of Ultralow Light Power Back-Reflected or Back-Scattered by Optical Components Using Balanced Low-Coherence Interferometry

Imran Khan, Michel Lequime, Myriam Zerrad, and Claude Amra

Phys. Rev. Applied 16, 044055 (2021) - Published 28 October, 2021

Fully Compensated Synthetic Antiferromagnets with Pronounced Anomalous Hall and Magneto-Optical Responses

Teng Xu, Heng-An Zhou, Yiqing Dong, Qihan Zhang, Mengqian Che, Liangyang Liu, Zhijie Wu, Ziqiang Guan, Luyi Yang, and Wanjun Jiang

Phys. Rev. Applied 16, 044056 (2021) - Published 28 October, 2021

Variational Inference with a Quantum Computer

Marcello Benedetti, Brian Coyle, Mattia Fiorentini, Michael Lubasch, and Matthias Rosenkranz

Phys. Rev. Applied 16, 044057 (2021) - Published 28 October, 2021

Mapping Transport Properties of Halide Perovskites via Short-Time-Dynamics Scaling Laws and Subnanosecond-Time-Resolution Imaging

Guillaume Vidon, Stefania Cacovich, Marie Legrand, Armelle Yaiche, Daniel Ory, Daniel Suchet, Jean-Baptiste Puel, and Jean-François Guillemoles

Phys. Rev. Applied 16, 044058 (2021) - Published 29 October, 2021

Impact of the Absorber-Coupling Design for Transition-Edge-Sensor X-Ray Calorimeters

M. de Wit, L. Gottardi, E. Taralli, K. Nagayoshi, M.L. Ridder, H. Akamatsu, M.P. Bruijn, R.W.M. Hoogeveen, J. van der Kuur, K. Ravensberg, D. Vaccaro, J.-R. Gao, and J.-W.A. den Herder

Phys. Rev. Applied 16, 044059 (2021) - Published 29 October, 2021

Miniaturization of Josephson Junctions for Digital Superconducting Circuits

I.I. Soloviev, S.V. Bakurskiy, V.I. Ruzhickiy, N.V. Klenov, M.Yu. Kupriyanov, A.A. Golubov, O.V. Skryabina, and V.S. Stolyarov

Phys. Rev. Applied 16, 044060 (2021) - Published 29 October, 2021

Superradiant Many-Qubit Absorption Refrigerator

Michal Kloc, Kurt Meier, Kimon Hadjikyriakos, and Gernot Schaller

Phys. Rev. Applied 16, 044061 (2021) - Published 29 October, 2021

Cooling fragile quantum systems requires quantum cooling technology. The smallest possible fridge employs a three-level system to autonomously cool the coldest of the three reservoirs. The authors suggest a setup with a quantum working fluid composed of N collectively coupled qubits to effectively implement such a refrigerator. The collective couplings lead to a quadratic boost of the cooling current, IN2.

Going Beyond the Causal Limit in Acoustic Absorption

Ho Yiu Mak, Xiaonan Zhang, Zhen Dong, Susumu Miura, Takuro Iwata, and Ping Sheng

Phys. Rev. Applied 16, 044062 (2021) - Published 29 October, 2021

Does Nature take something away with one hand and give it back with the other? Yes, in the case of acoustic absorption. The causality principle has been regarded as the reason one needs thick, bulky absorbers for low-frequency noise remediation. By judicious manipulation of the boundary condition on the backside of the absorber, the authors obtain broadband near-total absorption below 100 Hz with a 2-cm-thick sample, when the causal minimum is 15 cm. This complements metamaterial absorbers that are within the causal limit and effective at higher frequencies, yielding a holistic picture of the acoustic absorber design landscape, over the entire frequency range.

Generation of Multiple High-Order Bessel Beams Carrying Different Orbital-Angular-Momentum Modes through an Anisotropic Holographic Impedance Metasurface

Xiangshuai Meng, Xiaoming Chen, Ruihai Chen, Haiying Li, Tan Qu, and Anxue Zhang

Phys. Rev. Applied 16, 044063 (2021) - Published 29 October, 2021

Optical Brewster Metasurfaces Exhibiting Ultrabroadband Reflectionless Absorption and Extreme Angular Asymmetry

Huiying Fan, Jensen Li, Yun Lai, and Jie Luo

Phys. Rev. Applied 16, 044064 (2021) - Published 29 October, 2021

Ultrabroadband reflectionless absorption of light is in great demand for many applications. This study proposes a type of nonresonant, impedance-matched optical metasurface that exhibits ultrabroadband reflectionless absorption, based on the anomalous Brewster effect. Extremely asymmetric behavior—a transition from perfect transparency to perfect absorption—appears when the sign of the angle of incidence changes, due to the coexistence of the traditional and anomalous Brewster effects. Such high-efficiency metasurfaces may find application in optoelectronic and thermal devices such as photovoltaics, photodetectors, and thermal emitters.

Photonic Gap Antennas Based on High-Index-Contrast Slot Waveguides

Ashutosh Patri, Kévin G. Cognée, Louis Haeberlé, Vinod Menon, Christophe Caloz, and Stéphane Kéna-Cohen

Phys. Rev. Applied 16, 044065 (2021) - Published 29 October, 2021

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