Volume 79, Issue 24

15 December 1997

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LETTERS

General Physics

Reconstruction of the Joint State of a Two-Mode Bose-Einstein Condensate

Eric L. Bolda, Sze M. Tan, and Dan F. Walls

Phys. Rev. Lett. 79, 4719 (1997) - Published 15 December, 1997

Measuring the State of a Bosonic Two-Mode Quantum Field

R. Walser

Phys. Rev. Lett. 79, 4724 (1997) - Published 15 December, 1997

Vortex Coupler for Atomic Bose-Einstein Condensates

Karl-Peter Marzlin, Weiping Zhang, and Ewan M. Wright

Phys. Rev. Lett. 79, 4728 (1997) - Published 15 December, 1997

Gravitation and Astrophysics

Einstein's Equation in Ashtekar's Variables Constitutes a Symmetric Hyperbolic System

Mirta S. Iriondo, Enzo O. Leguizamón, and Oscar A. Reula

Phys. Rev. Lett. 79, 4732 (1997) - Published 15 December, 1997

The Case against Scaling Defect Models of Cosmic Structure Formation

Andreas Albrecht, Richard A. Battye, and James Robinson

Phys. Rev. Lett. 79, 4736 (1997) - Published 15 December, 1997

Structure Formation with a Self-Tuning Scalar Field

Pedro G. Ferreira and Michael Joyce

Phys. Rev. Lett. 79, 4740 (1997) - Published 15 December, 1997

Elementary Particles and Fields

$C$ , $P$ , and Strong $CP$ in Left-Right Supersymmetric Models

Rabindra N. Mohapatra, Andrija Rašin, and Goran Senjanović

Phys. Rev. Lett. 79, 4744 (1997) - Published 15 December, 1997

Minimal SO(10) Unification

S. M. Barr and Stuart Raby

Phys. Rev. Lett. 79, 4748 (1997) - Published 15 December, 1997

Low-Energy Signals for a Minimal Gauge-Mediated Model

Emidio Gabrielli and Uri Sarid

Phys. Rev. Lett. 79, 4752 (1997) - Published 15 December, 1997

Observation of the Decay $K^{+} \to π^{+} μ^{+} μ^{-}$

S. Adler et al.

Phys. Rev. Lett. 79, 4756 (1997) - Published 15 December, 1997

Properties of Jets in $W$ Boson Events from 1.8 TeV $\bar{p} p$ Collisions

F. Abe et al. (CDF Collaboration)

Phys. Rev. Lett. 79, 4760 (1997) - Published 15 December, 1997

Nuclear Physics

Relative Space-Time Asymmetries in Pion and Nucleon Production in Noncentral Nucleus-Nucleus Collisions at High Energies

S. Voloshin, R. Lednicky, S. Panitkin, and Nu Xu

Phys. Rev. Lett. 79, 4766 (1997) - Published 15 December, 1997

Atomic, Molecular, and Optical Physics

Positions and Isotope Shifts of the $H^{-} (^{1} P^{0})$ Dipole Resonances below the $H (n = 2)$ Threshold

H. H. Andersen, P. Balling, P. Kristensen, U. V. Pedersen, S. A. Aseyev, V. V. Petrunin, and T. Andersen

Phys. Rev. Lett. 79, 4770 (1997) - Published 15 December, 1997

Coherent Pulse Propagation and the Dynamics of Rydberg Wave Packets

J. Arlt, C. Weiss, G. Torosyan, and R. Beigang

Phys. Rev. Lett. 79, 4774 (1997) - Published 15 December, 1997

Giant Intermolecular Decay and Fragmentation of Clusters

L. S. Cederbaum, J. Zobeley, and F. Tarantelli

Phys. Rev. Lett. 79, 4778 (1997) - Published 15 December, 1997

Spin Squeezing in an Ensemble of Atoms Illuminated with Squeezed Light

A. Kuzmich, Klaus Mølmer, and E. S. Polzik

Phys. Rev. Lett. 79, 4782 (1997) - Published 15 December, 1997

Nonlinear Dynamics, Fluid Dynamics, Classical Optics, Etc.

Viscosity Oscillations and Hysteresis in Dilute Emulsions

Yiftah Navot and Moshe Schwartz

Phys. Rev. Lett. 79, 4786 (1997) - Published 15 December, 1997

Quantum Chaos in an Ion Trap: The Delta-Kicked Harmonic Oscillator

S. A. Gardiner, J. I. Cirac, and P. Zoller

Phys. Rev. Lett. 79, 4790 (1997) - Published 15 December, 1997

Quantum Chaos on Graphs

Tsampikos Kottos and Uzy Smilansky

Phys. Rev. Lett. 79, 4794 (1997) - Published 15 December, 1997

Dominance of Phonon Friction for a Xenon Film on a Silver (111) Surface

M. S. Tomassone, J. B. Sokoloff, A. Widom, and J. Krim

Phys. Rev. Lett. 79, 4798 (1997) - Published 15 December, 1997

Liquid Surface Wave Band Structure Instabilities

Tom Chou

Phys. Rev. Lett. 79, 4802 (1997) - Published 15 December, 1997

Point Contact Conductance of an Open Resonator

J. A. Katine, M. A. Eriksson, A. S. Adourian, R. M. Westervelt, J. D. Edwards, A. Lupu-Sax, E. J. Heller, K. L. Campman, and A. C. Gossard

Phys. Rev. Lett. 79, 4806 (1997) - Published 15 December, 1997

Plasma and Beam Physics

Enhanced Wakefields for the 1D Laser Wakefield Accelerator

R. J. Kingham and A. R. Bell

Phys. Rev. Lett. 79, 4810 (1997) - Published 15 December, 1997

Plasma Potential Well and Velocity Shear Layer at the Edge of Reversed Field Pinch Plasmas

V. Antoni, D. Desideri, E. Martines, G. Serianni, and L. Tramontin

Phys. Rev. Lett. 79, 4814 (1997) - Published 15 December, 1997

Condensed Matter: Structure, Etc.

Holographic Image Reconstruction from Electron Diffraction Intensities of Ordered Superstructures

K. Reuter, J. Bernhardt, H. Wedler, J. Schardt, U. Starke, and K. Heinz

Phys. Rev. Lett. 79, 4818 (1997) - Published 15 December, 1997

Determination of 2D Pair Correlations and Pair Interaction Energies of In Atoms in Molecular Beam Epitaxially Grown InGaAs Alloys

Kuo-Jen Chao, Chih-Kang Shih, D. W. Gotthold, and B. G. Streetman

Phys. Rev. Lett. 79, 4822 (1997) - Published 15 December, 1997

Optical Rotatory Power of a Chiral Liquid Crystal in a Confined Geometry

Daeseung Kang, Charles Rosenblatt, and Fouad M. Aliev

Phys. Rev. Lett. 79, 4826 (1997) - Published 15 December, 1997

Pressure-Induced Structural Relaxation in Amorphous ${Pd}_{40} {Ni}_{40} P_{20}$ : The Formation Volume for Diffusion Defects

G. Ruitenberg, Paul De Hey, F. Sommer, and Jilt Sietsma

Phys. Rev. Lett. 79, 4830 (1997) - Published 15 December, 1997

Fermi-Level-Pinning Defects in Highly n-Doped Silicon

D. J. Chadi, P. H. Citrin, C. H. Park, D. L. Adler, M. A. Marcus, and H.-J. Gossmann

Phys. Rev. Lett. 79, 4834 (1997) - Published 15 December, 1997

Acoustic Breathers in Two-Dimensional Lattices

S. Flach, K. Kladko, and S. Takeno

Phys. Rev. Lett. 79, 4838 (1997) - Published 15 December, 1997

Persistence, Poisoning, and Autocorrelations in Dilute Coarsening

Benjamin P. Lee and Andrew D. Rutenberg

Phys. Rev. Lett. 79, 4842 (1997) - Published 15 December, 1997

Phonon Softening and Lattice Melting at the Ferroelastic Phase Transition in ${Na}_{2} {CO}_{3}$

M. J. Harris, D. F. McMorrow, and K. W. Godfrey

Phys. Rev. Lett. 79, 4846 (1997) - Published 15 December, 1997

Bursting Dynamics of Thin Free Liquid Films from Newtonian and Viscoelastic Solutions

L. J. Evers, S. Yu. Shulepov, and G. Frens

Phys. Rev. Lett. 79, 4850 (1997) - Published 15 December, 1997

Growth of Patterned Surfaces

Harald Kallabis and Dietrich E. Wolf

Phys. Rev. Lett. 79, 4854 (1997) - Published 15 December, 1997

Equilibrium Shapes and Properties of Epitaxially Strained Islands

B. J. Spencer and J. Tersoff

Phys. Rev. Lett. 79, 4858 (1997) - Published 15 December, 1997

Direct Measurement of Colloidal Forces in an Anisotropic Solvent

P. Poulin, V. Cabuil, and D. A. Weitz

Phys. Rev. Lett. 79, 4862 (1997) - Published 15 December, 1997

Condensed Matter: Electronic Properties, Etc.

Structure and Thermal Expansion of ${LiV}_{2} O_{4}$ : Correlation between Structure and Heavy Fermion Behavior

O. Chmaissem, J. D. Jorgensen, S. Kondo, and D. C. Johnston

Phys. Rev. Lett. 79, 4866 (1997) - Published 15 December, 1997

Nonlinear Optical Response of the GaAs Exciton Polariton

Anne C. Schaefer and Duncan G. Steel

Phys. Rev. Lett. 79, 4870 (1997) - Published 15 December, 1997

Inelastic Quantum Transport

Janez Bonča and S. A. Trugman

Phys. Rev. Lett. 79, 4874 (1997) - Published 15 December, 1997

Time-Dependent Density Functional Theory Beyond the Adiabatic Local Density Approximation

G. Vignale, C. A. Ullrich, and S. Conti

Phys. Rev. Lett. 79, 4878 (1997) - Published 15 December, 1997

Imaging of Longitudinal Electron Focusing by Light-Induced Carrier Excitation

M. Primke, J. Heil, A. Böhm, A. Gröger, and P. Wyder

Phys. Rev. Lett. 79, 4882 (1997) - Published 15 December, 1997

Enhanced Carrier Lifetimes and Suppression of Midgap States in GaAs at a Magnetic Metal Interface

B. T. Jonker, O. J. Glembocki, R. T. Holm, and R. J. Wagner

Phys. Rev. Lett. 79, 4886 (1997) - Published 15 December, 1997

Nonequilibrium Superconductivity and Quasiparticle Dynamics Studied by Photoinduced Activation of mm-Wave Absorption

B. J. Feenstra, J. Schützmann, D. van der Marel, R. Pérez Pinaya, and M. Decroux

Phys. Rev. Lett. 79, 4890 (1997) - Published 15 December, 1997

A Displacive Structural Transformation in the ${CuO}_{2}$ Planes of ${{YBa}_{2} {Cu}_{3} O}_{x}$ at the Underdoped-Overdoped Phase Separation Line

E. Kaldis, J. Röhler, E. Liarokapis, N. Poulakis, K. Conder, and P. W. Loeffen

Phys. Rev. Lett. 79, 4894 (1997) - Published 15 December, 1997

Is the $π$ Particle Responsible for the 41 meV Peak in ${YBa}_{2} {Cu}_{3} O_{7}$ ?

Martin Greiter

Phys. Rev. Lett. 79, 4898 (1997) - Published 15 December, 1997

Finite-Size Studies on the SO(5) Symmetry of the Hubbard Model

Stefan Meixner, Werner Hanke, Eugene Demler, and Shou-Cheng Zhang

Phys. Rev. Lett. 79, 4902 (1997) - Published 15 December, 1997

Superexchange Coupling and Spin Susceptibility Spectral Weight in Undoped Monolayer Cuprates

P. Bourges, H. Casalta, A. S. Ivanov, and D. Petitgrand

Phys. Rev. Lett. 79, 4906 (1997) - Published 15 December, 1997

Dynamics of Magnetic Nanoparticles Studied by Neutron Scattering

Mikkel F. Hansen, Franz Bødker, Steen Mørup, Kim Lefmann, Kurt N. Clausen, and Per-Anker Lindgård

Phys. Rev. Lett. 79, 4910 (1997) - Published 15 December, 1997

Magnetic Structure of Cr in Exchange Coupled Fe/Cr(001) Superlattices

A. Schreyer, C. F. Majkrzak, Th. Zeidler, T. Schmitte, P. Bödeker, K. Theis-Bröhl, A. Abromeit, J. A. Dura, and T. Watanabe

Phys. Rev. Lett. 79, 4914 (1997) - Published 15 December, 1997

Thermal Vacancy Formation and Self-Diffusion in Intermetallic ${Fe}_{3} Si$ Nanocrystallites of Nanocomposite Alloys

R. Würschum, P. Farber, R. Dittmar, P. Scharwaechter, W. Frank, and H.-E. Schaefer

Phys. Rev. Lett. 79, 4918 (1997) - Published 15 December, 1997

Cross-Disciplinary Physics

Experiments on Tracer Diffusion in Thin Free-Standing Liquid-Crystal Films

J. Bechhoefer, J.-C. Géminard, L. Bocquet, and P. Oswald

Phys. Rev. Lett. 79, 4922 (1997) - Published 15 December, 1997

Active Transport in Biological Membranes and Stochastic Resonances

A. Fuliński

Phys. Rev. Lett. 79, 4926 (1997) - Published 15 December, 1997

COMMENTS

Polymer Adsorption on Disordered Substrates

Terence Hwa and Dinko Cule

Phys. Rev. Lett. 79, 4930 (1997) - Published 15 December, 1997

Chakraborty and Shakhnovich Reply:

Arup K. Chakraborty and E. I. Shakhnovich

Phys. Rev. Lett. 79, 4931 (1997) - Published 15 December, 1997

Comment on “Observation of a Distributed Epitaxial Oxide in Thermally Grown ${SiO}_{2}$ on Si(001)”

Takayoshi Shimura, Masataka Umeno, Isao Takahashi, and Jimpei Harada

Phys. Rev. Lett. 79, 4932 (1997) - Published 15 December, 1997

Munkholm et al. Reply:

A. Munkholm, S. Brennan, F. Comin, and L. Ortega

Phys. Rev. Lett. 79, 4933 (1997) - Published 15 December, 1997

Continuum Theory for Strained Epitaxial Islands

J. Tersoff

Phys. Rev. Lett. 79, 4934 (1997) - Published 15 December, 1997

Comment on ``Optical Conductivity of High $T_{c}$ Superconductors: From Underdoped to Overdoped''

C. Kendziora, Michael C. Martin, L. Forro, D. Mandrus, and L. Mihaly

Phys. Rev. Lett. 79, 4935 (1997) - Published 15 December, 1997

Puchkov and Timusk Reply:

A. V. Puchkov and T. Timusk

Phys. Rev. Lett. 79, 4936 (1997) - Published 15 December, 1997

Comment on ``Is the $π$ Particle Responsible for the 41 meV Peak in ${YBa}_{2} {Cu}_{3} O_{7}$ ?''

Eugene Demler, Shou-Cheng Zhang, Stefan Meixner, and Werner Hanke

Phys. Rev. Lett. 79, 4937 (1997) - Published 15 December, 1997

Comment on ``Dynamic Control of Cardiac Alternans''

Daniel J. Gauthier and Joshua E. S. Socolar

Phys. Rev. Lett. 79, 4938 (1997) - Published 15 December, 1997

ERRATA

Molecular Dynamics Study of Coherent Island Energetics, Stresses, and Strains in Highly Strained Epitaxy [Phys. Rev. Lett. 79, 905 (1997)]

Wenbin Yu and Anupam Madhukar

Phys. Rev. Lett. 79, 4939 (1997) - Published 15 December, 1997