Volume 73, Issue 8

22 August 1994

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LETTERS

General Physics

Stability of Discrete Solitons and Quasicollapse to Intrinsically Localized Modes

E. W. Laedke, K. H. Spatschek, and S. K. Turitsyn

Phys. Rev. Lett. 73, 1055 (1994) - Published 22 August, 1994

Reduced Dynamics Need Not Be Completely Positive

Philip Pechukas

Phys. Rev. Lett. 73, 1060 (1994) - Published 22 August, 1994

Exponential Behavior of a Quantum System in a Macroscopic Medium

Hiromichi Nakazato, Mikio Namiki, and Saverio Pascazio

Phys. Rev. Lett. 73, 1063 (1994) - Published 22 August, 1994

Gravitation and Astrophysics

Low pressure gaseous detector for particle dark matter

K. N. Buckland, M. J. Lehner, G. E. Masek, and M. Mojaver

Phys. Rev. Lett. 73, 1067 (1994) - Published 22 August, 1994

Elementary Particles and Fields

$N = 1$ Superstring as a Topological Field Theory

Neil Marcus

Phys. Rev. Lett. 73, 1071 (1994) - Published 22 August, 1994

Another Source of Baryons in $B$ Meson Decays

Isard Dunietz, Peter S. Cooper, Adam F. Falk, and Mark B. Wise

Phys. Rev. Lett. 73, 1075 (1994) - Published 22 August, 1994

Measurement of Cabibbo-Suppressed Decays of the $τ$ Lepton

M. Battle et al.

Phys. Rev. Lett. 73, 1079 (1994) - Published 22 August, 1994

Atomic, Molecular, and Optical Physics

cw laser ionization of $C_{60}$ and $C_{70}$

D. Ding, J. Huang, R. N. Compton, C. E. Klots, and R. E. Haufler

Phys. Rev. Lett. 73, 1084 (1994) - Published 22 August, 1994

Calculation of Electron Impact Total, Ionization, and Nonbreakup Cross Sections from the $3 S$ and $3 P$ States of Sodium

Igor Bray

Phys. Rev. Lett. 73, 1088 (1994) - Published 22 August, 1994

Nonlinear Dynamics, Fluid Dynamics, Classical Optics, Etc.

Smoothness Implies Determinism: A Method to Detect It in Time Series

Liming W. Salvino and Robert Cawley

Phys. Rev. Lett. 73, 1091 (1994) - Published 22 August, 1994

Experimental Observation of On-Off Intermittency

Philip W. Hammer, Nathan Platt, Stephen M. Hammel, James F. Heagy, and Bryan D. Lee

Phys. Rev. Lett. 73, 1095 (1994) - Published 22 August, 1994

Defects and Spacelike Properties of Delayed Dynamical Systems

G. Giacomelli, R. Meucci, A. Politi, and F. T. Arecchi

Phys. Rev. Lett. 73, 1099 (1994) - Published 22 August, 1994

Cooperative Bistability in Dense, Excited Atomic Systems

M. P. Hehlen, H. U. Güdel, Q. Shu, J. Rai, S. Rai, and S. C. Rand

Phys. Rev. Lett. 73, 1103 (1994) - Published 22 August, 1994

2:1 Resonance for Modulated Boundary-Layer Instability Waves: New Experimental Results Showing Quadratic Breakdown

J. J. Healey

Phys. Rev. Lett. 73, 1107 (1994) - Published 22 August, 1994

Plasma and Beam Physics

Large Amplitude Localized Structures in a Relativistic Electron-Positron Ion Plasma

V. I. Berezhiani and S. M. Mahajan

Phys. Rev. Lett. 73, 1110 (1994) - Published 22 August, 1994

Nonlinear Dynamics, Fluid Dynamics, Classical Optics, Etc.

Dynamic Structure Factor of Microemulsions

G. Gompper and M. Hennes

Phys. Rev. Lett. 73, 1114 (1994) - Published 22 August, 1994

Condensed Matter: Structure, Etc.

Anisotropic Phase Separation through the Metal-Insulator Transition in Amorphous Alloys

Michael J. Regan, Marybeth Rice, Marcela B. Fernandez van Raap, and Arthur Bienenstock

Phys. Rev. Lett. 73, 1118 (1994) - Published 22 August, 1994

Reversal of Ferroelectric Domains by Ultrashort Optical Pulses

S. Fahy and R. Merlin

Phys. Rev. Lett. 73, 1122 (1994) - Published 22 August, 1994

Anomalous Attenuation of Spin-Entropy Waves in Superfluid ${}^{3}{H e -} A_{1}$

M. Bastea, Y. Okuda, V. LaBella, and H. Kojima

Phys. Rev. Lett. 73, 1126 (1994) - Published 22 August, 1994

Condensed Matter: Electronic Properties, Etc.

Model of Fermions with Correlated Hopping (Integrable Cases)

Igor N. Karnaukhov

Phys. Rev. Lett. 73, 1130 (1994) - Published 22 August, 1994

Explicit Solutions of the Bethe Ansatz Equations for Bloch Electrons in a Magnetic Field

Yasuhiro Hatsugai, Mahito Kohmoto, and Yong-Shi Wu

Phys. Rev. Lett. 73, 1134 (1994) - Published 22 August, 1994

Sharp-Line Photoluminescence and Two-Photon Absorption of Zero-Dimensional Biexcitons in a GaAs/AlGaAs Structure

K. Brunner, G. Abstreiter, G. Böhm, G. Tränkle, and G. Weimann

Phys. Rev. Lett. 73, 1138 (1994) - Published 22 August, 1994

Direct Observation of Many-Electron Magnetoconductivity in a Nondegenerate 2D Electron Liquid

M. J. Lea, P. Fozooni, P. J. Richardson, and A. Blackburn

Phys. Rev. Lett. 73, 1142 (1994) - Published 22 August, 1994

Resonant Magnetotunneling via One-Dimensional Quantum Confined States

J. Wang, P. H. Beton, N. Mori, L. Eaves, H. Buhmann, L. Mansouri, P. C. Main, T. J. Foster, and M. Henini

Phys. Rev. Lett. 73, 1146 (1994) - Published 22 August, 1994

Activated Conductivity in the Quantum Hall Effect

D. G. Polyakov and B. I. Shklovskii

Phys. Rev. Lett. 73, 1150 (1994) - Published 22 August, 1994

Modulations in the CuO Chain Layer of $Y {Ba}_{2} {Cu}_{3} O_{7 - δ}$ : Charge Density Waves?

H. L. Edwards, A. L. Barr, J. T. Markert, and A. L. de Lozanne

Phys. Rev. Lett. 73, 1154 (1994) - Published 22 August, 1994

Stability of Ferromagnetism in the Hubbard Model

Hal Tasaki

Phys. Rev. Lett. 73, 1158 (1994) - Published 22 August, 1994

Competing Anisotropies in Holmium-Erbium Superlattices

J. A. Simpson, D. F. McMorrow, R. A. Cowley, D. A. Jehan, R. C. C. Ward, M. R. Wells, and K. N. Clausen

Phys. Rev. Lett. 73, 1162 (1994) - Published 22 August, 1994

UHV Cantilever Beam Technique for Quantitative Measurements of Magnetization, Magnetostriction, and Intrinsic Stress of Ultrathin Magnetic Films

M. Weber, R. Koch, and K. H. Rieder

Phys. Rev. Lett. 73, 1166 (1994) - Published 22 August, 1994

Voltage Generation on Cleavage of Silicon

D. G. Li, D. Haneman, N. S. McAlpine, and B. Chen

Phys. Rev. Lett. 73, 1170 (1994) - Published 22 August, 1994

Ferroelectric Domain Gratings in Strontium Barium Niobate Induced by Photorefractive Space Charge Fields

Anthony S. Kewitsch, Mordechai Segev, Amnon Yariv, Gregory J. Salamo, Terrence W. Towe, Edward J. Sharp, and Ratnakar R. Neurgaonkar

Phys. Rev. Lett. 73, 1174 (1994) - Published 22 August, 1994

Rabi Flopping in Semiconductors

S. T. Cundiff, A. Knorr, J. Feldmann, S. W. Koch, E. O. Göbel, and H. Nickel

Phys. Rev. Lett. 73, 1178 (1994) - Published 22 August, 1994

Cross-Disciplinary Physics

Scaling Properties of a Spin Model of Microemulsions

Muhammad Sahimi and Parisa Nowroozi

Phys. Rev. Lett. 73, 1182 (1994) - Published 22 August, 1994

Covariant Hydrodynamics of Fluid Membranes

Weicheng Cai and T. C. Lubensky

Phys. Rev. Lett. 73, 1186 (1994) - Published 22 August, 1994

ERRATA

Simultaneous Measurement of the $\frac{(γ, p)}{(γ, n)}$ Cross-Section Ratio in ${}^{4}{He}$ as a test of Charge Symmetry

R. E. J. Florizone, J. Asai, G. Feldman, E. L. Hallin, D. M. Skopik, J. M. Vogt, R. C. Haight, and S. M. Sterbenz

Phys. Rev. Lett. 73, 1190 (1994) - Published 22 August, 1994

Oscillations of Interlayer Exchange Coupling and Giant Magnetoresistance in (111) Oriented Permalloy/Au Multilayers

S. S. P. Parkin, R. F. C. Farrow, R. F. Marks, A. Cebollada, G. R. Harp, and R. J. Savoy

Phys. Rev. Lett. 73, 1190 (1994) - Published 22 August, 1994

Particle Velocity Distributions and Ionization Processes in a Gas-Puff $Z$ Pinch

M. E. Foord, Y. Maron, G. Davara, L. Gregorian, and A. Fisher

Phys. Rev. Lett. 73, 1190 (1994) - Published 22 August, 1994