Origin of charge density wave in the kagome metal as revealed by optical spectroscopy
Xiaoxiang Zhou, Yongkai Li, Xinwei Fan, Jiahao Hao, Yaomin Dai, Zhiwei Wang, Yugui Yao, and Hai-Hu Wen
Phys. Rev. B 104, L041101 (2021) - Published 2 July, 2021
The recently discovered kagome metals VSb (=K, Rb or Cs) have generated great interest as they exhibit an unconventional charge density wave (CDW), superconductivity, and nontrivial band topology. Here, the authors combine infrared spectroscopy and first-principles calculations to shed light on the origin of the CDW. They find that below the CDW transition the optical conductivity component associated with the saddle points is significantly suppressed, while that arising from the light-electron and Dirac bands is not affected. These observations attest to the importance of saddle point nesting in driving the CDW instability in CsVSb.
Origins of electronic bands in the antiferromagnetic topological insulator
Chenhui Yan, Sebastian Fernandez-Mulligan, Ruobing Mei, Seng Huat Lee, Nikola Protic, Rikuto Fukumori, Binghai Yan, Chaoxing Liu, Zhiqiang Mao, and Shuolong Yang
Phys. Rev. B 104, L041102 (2021) - Published 6 July, 2021
Concurrence of anomalous Hall effect and charge density wave in a superconducting topological kagome metal
F. H. Yu, T. Wu, Z. Y. Wang, B. Lei, W. Z. Zhuo, J. J. Ying, and X. H. Chen
Phys. Rev. B 104, L041103 (2021) - Published 8 July, 2021
As one of the most fundamental physical phenomena, the anomalous Hall effect (AHE) typically occurs in ferromagnetic materials but is not expected in conventional superconductors. Here, the authors find a giant AHE in the kagome superconductor CsVSb. Strikingly, the AHE develops spontaneously with the occurrence of a charge density wave (CDW), indicating a strong correlation between the CDW state and AHE. These discoveries make CsVSb an ideal platform to study the interplay among nontrivial band topology, CDW, and unconventional superconductivity
Symmetry-enforced ideal lanternlike phonons in the ternary nitride
Xiaotian Wang, Feng Zhou, Tie Yang, Minquan Kuang, Zhi-Ming Yu, and Gang Zhang
Phys. Rev. B 104, L041104 (2021) - Published 9 July, 2021
NMR determination of Van Hove singularity and Lifshitz transitions in the nodal-line semimetal ZrSiTe
Yefan Tian, Yanglin Zhu, Rui Li, Zhiqiang Mao, and Joseph H. Ross, Jr.
Phys. Rev. B 104, L041105 (2021) - Published 13 July, 2021
ZrSiTe is of great interest due to its nonsymmorphic symmetry-protected Dirac nodal line close to the Fermi energy. Here, the authors show that the nodal line behaves energetically as a quasi-two-dimensional feature using nuclear magnetic resonance spectroscopy. They furthermore identify a 2D Van Hove singularity, an unusual occurrence in a bulk material akin to the analogous feature in twisted bilayer graphene. These results drive a temperature-dependent Lifshitz transition, opening the prospect for engineering new electronic transformations with Fermi level tuning.
Flat topological bands and eigenstate criticality in a quasiperiodic insulator
Yixing Fu, Justin H. Wilson, and J. H. Pixley
Phys. Rev. B 104, L041106 (2021) - Published 15 July, 2021
Coexistence of zero-, one-, and two-dimensional degeneracy in tetragonal phonons
Jianhua Wang, Hongkuan Yuan, Minquan Kuang, Tie Yang, Zhi-Ming Yu, Zeying Zhang, and Xiaotian Wang
Phys. Rev. B 104, L041107 (2021) - Published 15 July, 2021
Ground state in proximity to a possible Kitaev spin liquid: The undistorted honeycomb iridate
Hengdi Zhao, Bing Hu, Feng Ye, Minhyea Lee, Pedro Schlottmann, and Gang Cao
Phys. Rev. B 104, L041108 (2021) - Published 20 July, 2021
The Kitaev quantum spin liquid has been among the most intensively studied states of matter but there has been no clear-cut materials realization of it. This absence is largely because all existing honeycomb lattices are inherently distorted and disordered, which inevitably amplifies the competing Heisenberg interaction in the Kitaev-Heisenberg model, leading to an unwanted antiferromagnetic state. This work reports a new, undistorted honeycomb iridate NaxIrO, where all evidence indicates that the elusive Kitaev spin liquid may finally be within reach.
Electronic and dynamical properties of : Role of layers and expected orbital order
Andrzej Ptok, Konrad J. Kapcia, Paweł T. Jochym, Jan Łażewski, Andrzej M. Oleś, and Przemysław Piekarz
Phys. Rev. B 104, L041109 (2021) - Published 21 July, 2021
Quantum oscillation of thermally activated conductivity in a monolayer -like excitonic insulator
Wen-Yu He and Patrick A. Lee
Phys. Rev. B 104, L041110 (2021) - Published 23 July, 2021
Heavy carrier doping by hydrogen in the spin-orbit coupled Mott insulator
Y. Yamashita, G. Lim, T. Maruyama, A. Chikamatsu, T. Hasegawa, H. Ogino, T. Ozawa, M. Wilde, K. Fukutani, T. Terashima, M. Ochi, K. Kuroki, H. Kitagawa, and M. Maesato
Phys. Rev. B 104, L041111 (2021) - Published 27 July, 2021
Pitfalls and solutions for perovskite transparent conductors
Liang Si, Josef Kaufmann, Zhicheng Zhong, Jan M. Tomczak, and Karsten Held
Phys. Rev. B 104, L041112 (2021) - Published 28 July, 2021








