Volume 80, Issue 21

N. Stolterfoht, J.-Y. Chesnel, M. Grether, B. Skogvall, F. Frémont, D. Lecler, D. Hennecart, X. Husson, J. P. Grandin, B. Sulik, L. Gulyás, and J. A. Tanis

Phys. Rev. Lett. 80, 4649 (1998) - Published 25 May, 1998

Nonlinear Dynamics, Fluid Dynamics, Classical Optics, Etc.

Localization in Discontinuous Quantum Systems

Fausto Borgonovi

Phys. Rev. Lett. 80, 4653 (1998) - Published 25 May, 1998

Observation of Multihump Multimode Solitons

Matthew Mitchell, Mordechai Segev, and Demetrios N. Christodoulides

Phys. Rev. Lett. 80, 4657 (1998) - Published 25 May, 1998

Supercritical Eckhaus Instability for Surface-Tension-Driven Hydrothermal Waves

Nathalie Mukolobwiez, Arnaud Chiffaudel, and François Daviaud

Phys. Rev. Lett. 80, 4661 (1998) - Published 25 May, 1998

Short Wave Instability on Vortex Filaments

Hongyun Wang

Phys. Rev. Lett. 80, 4665 (1998) - Published 25 May, 1998

Stabilization, Selection, and Tracking of Unstable Patterns by Weak Spatial Perturbations

Peng-Ye Wang, Ping Xie, Jian-Hua Dai, and Hong-Jun Zhang

Phys. Rev. Lett. 80, 4669 (1998) - Published 25 May, 1998

Plasma and Beam Physics

Overcoming Intrinsic Spin Resonances with an rf Dipole

M. Bai et al.

Phys. Rev. Lett. 80, 4673 (1998) - Published 25 May, 1998

Multiple Electron Beams Generated by a Helicon Plasma Discharge

Robert Tseng Shiung Chen and Noah Hershkowitz

Phys. Rev. Lett. 80, 4677 (1998) - Published 25 May, 1998

D-T Fusion with Ion Cyclotron Resonance Heating in the JET Tokamak

D. F. H. Start et al.

Phys. Rev. Lett. 80, 4681 (1998) - Published 25 May, 1998

Condensed Matter: Structure, Etc.

Adhesion Interaction between Atomically Defined Tip and Sample

G. Cross, A. Schirmeisen, A. Stalder, P. Grütter, M. Tschudy, and U. Dürig

Phys. Rev. Lett. 80, 4685 (1998) - Published 25 May, 1998

Evidence for Growth of Collective Excitations in Glasses at Low Temperatures

Douglas Natelson, Danna Rosenberg, and D. D. Osheroff

Phys. Rev. Lett. 80, 4689 (1998) - Published 25 May, 1998

Breakdown of Scale Invariance in the Phase Ordering of Fractal Clusters

Massimo Conti, Baruch Meerson, and Pavel V. Sasorov

Phys. Rev. Lett. 80, 4693 (1998) - Published 25 May, 1998

High-Temperature Series Analysis of 2D Random-Bond Ising Ferromagnets

Alexandra Roder, Joan Adler, and Wolfhard Janke

Phys. Rev. Lett. 80, 4697 (1998) - Published 25 May, 1998

Rigorous Proof of a Liquid-Vapor Phase Transition in a Continuum Particle System

J. L. Lebowitz, A. E. Mazel, and E. Presutti

Phys. Rev. Lett. 80, 4701 (1998) - Published 25 May, 1998

Giant Mass and Anomalous Mobility of Particles in a Fermionic System

Achim Rosch and Thilo Kopp

Phys. Rev. Lett. 80, 4705 (1998) - Published 25 May, 1998

Concentration Dependence of the Effective Mass of $^{3} He$ Atoms in $^{3} He -^{4} He$ Mixtures

E. Krotscheck, M. Saarela, K. Schörkhuber, and R. Zillich

Phys. Rev. Lett. 80, 4709 (1998) - Published 25 May, 1998

X-Ray Scattering Study of the Surface Morphology of Au(111) during ${Ar}^{+}$ Ion Irradiation

M. V. Ramana Murty, T. Curcic, A. Judy, B. H. Cooper, A. R. Woll, J. D. Brock, S. Kycia, and R. L. Headrick

Phys. Rev. Lett. 80, 4713 (1998) - Published 25 May, 1998

SiGe Island Shape Transitions Induced by Elastic Repulsion

J. A. Floro, G. A. Lucadamo, E. Chason, L. B. Freund, M. Sinclair, R. D. Twesten, and R. Q. Hwang

Phys. Rev. Lett. 80, 4717 (1998) - Published 25 May, 1998

Temperature Dependence of SiGe Coherent Island Formation on Si(100): Anomalous Reentrant Behavior

X. Deng, J. D. Weil, and M. Krishnamurthy

Phys. Rev. Lett. 80, 4721 (1998) - Published 25 May, 1998

Condensed Matter: Electronic Properties, Etc.

“Majority Representation” of Alloy Electronic States

L.-W. Wang, L. Bellaiche, S.-H. Wei, and A. Zunger

Phys. Rev. Lett. 80, 4725 (1998) - Published 25 May, 1998

Localized and Delocalized Electronic States in Single-Wall Carbon Nanotubes

T. Pichler, M. Knupfer, M. S. Golden, J. Fink, A. Rinzler, and R. E. Smalley

Phys. Rev. Lett. 80, 4729 (1998) - Published 25 May, 1998

Strongly Driven Semiconductor Microcavities: From the Polariton Doublet to an ac Stark Triplet

F. Quochi, G. Bongiovanni, A. Mura, J. L. Staehli, B. Deveaud, R. P. Stanley, U. Oesterle, and R. Houdré

Phys. Rev. Lett. 80, 4733 (1998) - Published 25 May, 1998

Wigner Crystal Type of Charge Ordering in an Organic Conductor with a Quarter-Filled Band: $(DI - DCNQI)_{2} Ag$

K. Hiraki and K. Kanoda

Phys. Rev. Lett. 80, 4737 (1998) - Published 25 May, 1998

Atomic Scale Observations of Metal-Induced Gap States at ${222}$ MgO/Cu Interfaces

D. A. Muller, D. A. Shashkov, R. Benedek, L. H. Yang, J. Silcox, and D. N. Seidman

Phys. Rev. Lett. 80, 4741 (1998) - Published 25 May, 1998

Neutral Fermions at Filling Factor $ν = 1 / 2$

Dung-Hai Lee

Phys. Rev. Lett. 80, 4745 (1998) - Published 25 May, 1998

Cyclotron Resonance in a Two-Dimensional Electron Gas with Long-Range Randomness

M. M. Fogler and B. I. Shklovskii

Phys. Rev. Lett. 80, 4749 (1998) - Published 25 May, 1998

$c$ -Axis Optical Reflectivity of Layered Cuprate Superconductors

S. Das Sarma and E. H. Hwang

Phys. Rev. Lett. 80, 4753 (1998) - Published 25 May, 1998

Shape Distortion by Irreversible Flux-Pinning-Induced Magnetostriction

T. H. Johansen, J. Lothe, and H. Bratsberg

Phys. Rev. Lett. 80, 4757 (1998) - Published 25 May, 1998

$T$ Dependence of the Magnetic Penetration Depth in Unconventional Superconductors at Low Temperatures: Can It Be Linear?

N. Schopohl and O. V. Dolgov

Phys. Rev. Lett. 80, 4761 (1998) - Published 25 May, 1998

Self-Consistent Electronic Structure of a $d_{x^{2} - y^{2}}$ and a $d_{x^{2} - y^{2}} + {id}_{xy}$ Vortex

M. Franz and Z. Tešanović

Phys. Rev. Lett. 80, 4763 (1998) - Published 25 May, 1998

Magnetic Gaps Related to Spin Glass Order in Fermionic Systems

R. Oppermann and B. Rosenow

Phys. Rev. Lett. 80, 4767 (1998) - Published 25 May, 1998

Multioverlap Simulations of the 3D Edwards-Anderson Ising Spin Glass

Bernd A. Berg and Wolfhard Janke

Phys. Rev. Lett. 80, 4771 (1998) - Published 25 May, 1998

Thermoelectric Response Near the Density Driven Mott Transition

Gunnar Pálsson and Gabriel Kotliar

Phys. Rev. Lett. 80, 4775 (1998) - Published 25 May, 1998

Neutron-Diffraction Study of Quadrupolar Order in TmTe: First Evidence for a Field-Induced Magnetic Superstructure

P. Link, A. Gukasov, J.-M. Mignot, T. Matsumura, and T. Suzuki

Phys. Rev. Lett. 80, 4779 (1998) - Published 25 May, 1998

Finite-Size Scaling in Thin Fe/Ir(100) Layers

Malte Henkel, Stéphane Andrieu, Philippe Bauer, and Michel Piecuch

Phys. Rev. Lett. 80, 4783 (1998) - Published 25 May, 1998

Magnetization of Ag Sinters Made of Compressed Particles of Submicron Grain Size and Their Coupling to Liquid $^{3} He$

R. König, Th. Herrmannsdörfer, and I. Batko

Phys. Rev. Lett. 80, 4787 (1998) - Published 25 May, 1998

What Determines Inhomogeneous Linewidths in Semiconductor Microcavities?

D. M. Whittaker

Phys. Rev. Lett. 80, 4791 (1998) - Published 25 May, 1998

Influence of Structural Disorder and Light Coupling on the Excitonic Response of Semiconductor Microcavities

C. Ell, J. Prineas, T. R. Nelson, Jr., S. Park, H. M. Gibbs, G. Khitrova, S. W. Koch, and R. Houdré

Phys. Rev. Lett. 80, 4795 (1998) - Published 25 May, 1998

X-Ray Natural Circular Dichroism

Lucilla Alagna, Tommaso Prosperi, Stefano Turchini, José Goulon, Andrei Rogalev, Chantal Goulon-Ginet, Calogero R. Natoli, Robert D. Peacock, and Brian Stewart

Phys. Rev. Lett. 80, 4799 (1998) - Published 25 May, 1998

Femtosecond Four-Wave Mixing Experiments on GaAs Quantum Wells Using Two Independently Tunable Lasers

D. S. Kim, J. Y. Sohn, J. S. Yahng, Y. H. Ahn, K. J. Yee, D. S. Yee, Y. D. Jho, S. C. Hohng, D. H. Kim, W. S. Kim, J. C. Woo, T. Meier, S. W. Koch, D. H. Woo, E. K. Kim, S. H. Kim, and C. S. Kim

Phys. Rev. Lett. 80, 4803 (1998) - Published 25 May, 1998

Picosecond Raman Studies of the Electron-Phonon Interactions in ${Al}_{x} {Ga}_{1 - x} As$ : Nonmonotonic Dependence upon the Alloy Composition

K. T. Tsen, D. K. Ferry, A. Salvador, and H. Morkoc

Phys. Rev. Lett. 80, 4807 (1998) - Published 25 May, 1998

COMMENTS

Comment on “Role of Intermittency in Urban Development: A Model of Large-Scale City Formation”

Matteo Marsili, Sergei Maslov, and Yi-Cheng Zhang

Phys. Rev. Lett. 80, 4830 (1998) - Published 25 May, 1998

Zanette and Manrubia Reply:

Damián H. Zanette and Susanna C. Manrubia

Phys. Rev. Lett. 80, 4831 (1998) - Published 25 May, 1998

ERRATA

Erratum: Virial Approach to Hard-Sphere Demixing [Phys. Rev. Lett. 79, 1881 (1997)]

Tamara Coussaert and Marc Baus

Phys. Rev. Lett. 80, 4832 (1998) - Published 25 May, 1998

Volume 80, Issue 21

LETTERS

General Physics

Gravitation and Astrophysics

Elementary Particles and Fields