NEWSPAPER 78

PHYSICAL REVIEW LETTERS Contents

VOLUME 78, NUMBER 7 17 February 1997

General Physics Nonlinear Response for Time-dependent External Fields ...... 1199 Janka Petravic and Denis J. Evans Planar Curve Representation of Many-Body Systems and Dynamics ...... 1203 Raphael Blumenfeld Energy Tresholds for Discrete Breathers in One-, Two-, and Three-Dimensional Lattices ...... 1207 S. Flach, K. Kladko, and R. S. MacKay Dressed Coherent States of the Anharmonic Oscillator ...... 1211 D. Enzer and G. Gabrielse Coalescence and Droplets in the Subcritical Nonlinear Schrödinger Equation ...... 1215 Christophe Josserand and Sergio Rica

Elementary Particles and Fields Pointlike D-brane Dynamics and Space-Time Uncertainty Relation ...... 1219

Miao Li and Tamiaki Yoneya CODEN: PRLTAO 78 (7), 1199–1397 (17 February 1997) Family Replication in the Dual Standard Model ...... 1223 Hong Liu, Glenn D. Starkman, and Tanmay Vachaspati Quarkonia in Hamiltonian Light-Front QCD ...... 1227 Martina M. Brisudová, Robert J. Perry, and Kenneth G. Wilson

Nuclear Physics Exact Dirac Equation Calculation of Ionization and Pair Production Induced by Ultrarelativistic Heavy Ions ...... 1231 A. J. Baltz Evidence for Nuclear Tensor Polarization of Deuterium Molecules in Storage Cells ...... 1235 J. F. J. van den Brand, H. J. Bulten, M. Ferro-Luzzi, Z.-L. Zhou, R. Alarcon, T. Botto, M. Bouwhuis, S. Dolfini, R. Ent, P. Heimberg, D. Higinbotham, C. W. de Jager, J. Lang, D. J. de Lange, G. J. Nooren, N. Papadakis, I. Passchier, H. R. Poolman, J. J. M. Steijger, O. Unal, N. Vodinas, and H. de Vries

Atomic, Molecular, and Optical Physics Spectroscopic Evidence for Excitonic Localization in Fractal Antenna Supermolecules ...... 1239 Raoul Kopelman, Michael Shortreed, Zhong-You Shi, Weihong Tan, Zhifu Xu, Jeffrey S. Moore, Arie Bar-Haim, and Joseph Klafter Quantum Nondemolition Measurements Improved by a Squeezed Meter Input ...... 1243 Robert Bruckmeier, Klaus Schneider, Stephan Schiller, and Jürgen Mlynek

Nonlinear Dynamics, Fluid Dynamics, Classical Optics, Etc. Noise Filtering in Communication with Chaos ...... 1247 Epaminondas Rosa, Jr., Scott Hayes, and Celso Grebogi High-Harmonic Generation of Attosecond Pulses in the “Single-Cycle” Regime ...... 1251 Ivan P. Christov, Margaret M. Murnane, and Henry C. Kapteyn Rise-Time Regimes of a Large Sphere in Vibrated Bulk Solids ...... 1255 7 Loic Vanel, Anthony D. Rosato, and Rajesh N. Dave

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Cell Formation in Cylinder Wakes at Low Reynolds Numbers ...... 1259 T. Leweke, M. Provansal, G. D. Miller, and C. H. K. Williamson

Plasma and Beam Physics Nonlinear Landau Damping ...... 1263 G. Brodin Isolation of the Improved Core Confinement from High Recycling and Radiative Boundary in Reversed Magnetic Shear Plasmas of JT-60U ...... 1267 K. Itami, R. Yoshino, N. Asakura, T. Fujita, N. Hosogane, O. Naito, S. Higashijima, S. Konoshima, A. Sakasai, H. Takenaga, and M. Shimada

Condensed Matter: Structure, Etc. Al Nucleation on Monohydride and Bare Si(001) Surfaces: Atomic Scale Patterning ...... 1271 T.-C. Shen, C. Wang, and J. R. Tucker Dynamics of Block Copolymer Micelles Revealed by X-Ray Intensity Fluctuation Spectroscopy ...... 1275 S. G. J. Mochrie, A. M. Mayes, A. R. Sandy, M. Sutton, S. Brauer, G. B. Stephenson, D. L. Abernathy, and G. Grübel Observation of Magnetism of Fe at an Interstitial Site in a Metal Host ...... 1279 J. Kapoor, D. Riegel, Yi Li, C. Polaczyk, J. Andres, F. Mezei, R. Sielemann, Y. Yoshida, W. D. Brewer, L. A. de Mello, and S. Frota-Pessôa Lifetime of Phonons in Semiconductors under Pressure ...... 1283 C. Ulrich, E. Anastassakis, K. Syassen, A. Debernardi, and M. Cardona Creation of Intrinsic Localized Modes via Optical Control of Anharmonic Lattices ...... 1287 T. Rössler and J. B. Page Simulation of Structure and Dynamics near the Isotropic-Nematic Transition ...... 1291 Michael P. Allen and Mark A. Warren Dynamical Transitions in Correlated Driven Diffusion in a Periodic Potential ...... 1295 Oleg M. Braun, Thierry Dauxois, Maxim V. Paliy, and Michel Peyrard Surface Relaxation and Ferromagnetism of Rh(001) ...... 1299 Jun-Hyung Cho and Matthias Scheffler Stress Condensation in Crushed Elastic Manifolds ...... 1303 Eric M. Kramer and Thomas A. Witten

Condensed Matter: Electronic Properties, Etc. Characteristic Crossing Points in Specific Heat Curves of Correlated Systems ...... 1307 D. Vollhardt Electronic Structure of Lanthanum Hydrides with Switchable Optical Properties ...... 1311 K. K. Ng, F. C. Zhang, V. I. Anisimov, and T. M. Rice Theoretical Prediction of the Structure of Insulating YH3 ...... 1315 P. J. Kelly, J. P. Dekker, and R. Stumpf Magnetically Enhanced Exciton-Exciton Correlations in Semiconductors ...... 1319 P. Kner, S. Bar-Ad, M. V. Marquezini, D. S. Chemla, and W. Schäfer Orbital Ordering in a Two-Dimensional Triangular Lattice ...... 1323 H. F. Pen, J. van den Brink, D. I. Khomskii, and G. A. Sawatzky Depopulation of the Ag(111) Surface State Assigned to Strain in Epitaxial Films ...... 1327 Georg Neuhold and Karsten Horn Mott Insulating Ground State on a Triangular Surface Lattice ...... 1331 H. H. Weitering, X. Shi, P. D. Johnson, J. Chen, N. J. DiNardo, and K. Kempa Gate Control of Spin-Orbit Interaction in an Inverted In 0.53Ga 0.47As͞In 0.52Al 0.48As Heterostructure ...... 1335 Junsaku Nitta, Tatsushi Akazaki, Hideaki Takayanagi, and Takatomo Enoki Optical Dephasing in Cu(111) Measured by Interferometric Two-Photon Time-Resolved Photoemission ...... 1339 S. Ogawa, H. Nagano, H. Petek, and A. P. Heberle

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Ferromagnetism in the Two Dimensional t-t0 Hubbard Model at the Van Hove Density ...... 1343 R. Hlubina, S. Sorella, and F. Guinea Unusual Ordering Behavior in Single-Crystal U2Rh3Si5 ...... 1347 B. Becker, S. Ramakrishnan, A. A. Menovsky, G. J. Nieuwenhuys, and J. A. Mydosh Interplay between Spin-Density Wave and Proximity Magnetic Layers ...... 1351 Zhu-Pei Shi and R. S. Fishman Spin Quantum Beats of 2D Excitons ...... 1355 T. Amand, X. Marie, P. Le Jeune, M. Brousseau, D. Robart, J. Barrau, and R. Planel Sonoluminescing Air Bubbles Rectify Argon ...... 1359 Detlef Lohse, Michael P. Brenner, Todd F. Dupont, Sascha Hilgenfeldt, and Blaine Johnston Quantum Confined Fano Interference ...... 1363 S. Bar-Ad, P. Kner, M. V. Marquezini, S. Mukamel, and D. S. Chemla X-Ray Scattering Study of Porous Silicon Growth during Anodic Dissolution ...... 1367 H. You, Z. Nagy, and K. Huang

Cross-Disciplinary Physics Stability of a Flame in a Closed Chamber ...... 1371 V. V. Bychkov and M. A. Liberman State-to-state Scattering of Metastable CO Molecules from a LiF(100) Surface ...... 1375 Rienk T. Jongma, Giel Berden, Dorien van der Zande, Theo Rasing, Helmut Zacharias, and Gerard Meijer Phase Behavior of Colloids in Binary Liquid Mixtures ...... 1379 Yalia Jayalakshmi and Eric W. Kaler Cluster Formation due to Collisions in Granular Material ...... 1383 A. Kudrolli, M. Wolpert, and J. P. Gollub Spatiotemporal Chaos in a Simulated Ring of Cardiac Cells ...... 1387 Zhilin Qu, James N. Weiss, and Alan Garfinkel

Comments Comment on “Universal Scaling Law for the Largest Lyapunov Exponent in Coupled Map Lattices” ...... 1391 A. Torcini, R. Livi, A. Politi, and S. Ruffo Renormalization Group Approach to the Critical Behavior of the Forest-Fire Model ...... 1392 Barbara Drossel Loreto et al Reply ...... 1393 V. Loreto, L. Pietronero, A. Vespignani, and S. Zapperi Comment on “Biological Effects of Stellar Collapse Neutrinos” ...... 1394 J. D. Cossairt and E. T. Marshall Collar Replies ...... 1395 J. I. Collar

Errata Generalized Gradient Approximation Made Simple [Phys. Rev. Lett. 77, 3865 (1996)] ...... 1396 John P. Perdew, Kieron Burke, and Matthias Ernzerhof K1 Emission in Symmetric Heavy Ion Reactions at Subthreshold Energies [Phys. Rev. Lett. 77, 4884 (1996)] ...... 1396 R. Elmér, M. Berg, L. Carlén, B. Jakobsson, B. Norén, A. Oskarsson, G. Ericsson, J. Julien, T.-F. Thorsteinsen, M. Guttormsen, G. Løvhøiden, V. Bellini, E. Grosse, C. Müntz, P. Senger, and L. Westerberg Integrable Impurity in the Supersymmetric t-J Model [Phys. Rev. Lett. 77, 5098 (1996)] ...... 1397 Gerald Bedürftig, Fabian H. L. Essler, and Holger Frahm