NEWSPAPER 80 PHYSICAL REVIEW LETTERS Contents VOLUME 80, NUMBER 5 2 February 1998 General Physics Chaos and Interacting Electrons in Ballistic Quantum Dots . ............................................................ 895 Denis Ullmo, Harold U. Baranger, Klaus Richter, Felix von Oppen, and Rodolfo A. Jalabert Gravitation and Astrophysics Neutrino-Photon Reactions in Astrophysics and Cosmology . ............................................................ 900 D. Seckel Quantum Geometry and Black Hole Entropy ............................................................................. 904 A. Ashtekar, J. Baez, A. Corichi, and K. Krasnov Elementary Particles and Fields Thermodynamics of Cosmic String Densities in U(1) Scalar Field Theory ................................................ 908 Nuno D. Antunes, Luı´s M. A. Bettencourt, and Mark Hindmarsh SUsNd Supersymmetric Grand Unified Theories: Natural Projection to Low Energies ................................... 912 J. L. Chkareuli, I. G. Gogoladze, and A. B. Kobakhidze Nuclear Physics CODEN: PRLTAO 80 (5), 895–1119 (2 February 1998) Analytic Solution of the Pion-Laser Model . ............................................................................. 916 T. Csörg˝o and J. Zimányi Isotope Shift Measurements for Superdeformed Fission Isomeric States . ................................................ 920 H. Backe, M. Hies, H. Kunz, W. Lauth, O. Curtze, P. Schwamb, M. Sewtz, W. Theobald, R. Zahn, K. Eberhardt, N. Trautmann, D. Habs, R. Repnow, and B. Fricke Measurements of the Electric Quadrupole Moment of Nb and Zr Isotopes with Modulated Adiabatic Fast Passage after Recoil Implantation into hcp Co ....................................................................................... 924 G. Seewald, E. Hagn, E. Zech, I. P. Johnstone, I. S. Towner, D. Forkel-Wirth, and ISOLDE Collaboration New Measurement and Analysis of the 7Besp, gd8B Cross Section . ...................................................... 928 F. Hammache, G. Bogaert, P. Aguer, C. Angulo, S. Barhoumi, L. Brillard, J. F. Chemin, G. Claverie, A. Coc, M. Hussonnois, M. Jacotin, J. Kiener, A. Lefebvre, J. N. Scheurer, J. P. Thibaud, and E. Virassamynaı¨ken Atomic, Molecular, and Optical Physics Adiabatic Passage by Light-Induced Potentials in Molecules . ............................................................ 932 B. M. Garraway and K.-A. Suominen Ultracold Collisions Observed in Real Time . ............................................................................. 936 S. D. Gensemer and P. L. Gould Multilevel Dark States: Coherent Population Trapping with Elliptically Polarized Incoherent Light . ................... 940 Valery Milner and Yehiam Prior Nonlinear Dynamics, Fluid Dynamics, Classical Optics, Etc. Scar Formation at the Edge of the Chaotic Region ....................................................................... 944 F. J. Arranz, F. Borondo, and R. M. Benito 5 (Continued on Third Cover) Contents (Continued) Coexistence of Ballistic Transport, Diffusion, and Localization in Surface Disordered Waveguides ....................... 948 J. A. Sánchez-Gil, V. Freilikher, I. Yurkevich, and A. A. Maradudin Nonvanishing Field between a Dipole Oscillator and a Reflecting Boundary during Suppression of Dipole Radiation . 952 Martti Kauranen, Yves Van Rompaey, Jeffery J. Maki, and André Persoons Photonic Band Gaps in Two Dimensional Photonic Quasicrystals . ...................................................... 956 Y. S. Chan, C. T. Chan, and Z. Y. Liu Channel Drop Tunneling through Localized States . ....................................................................... 960 Shanhui Fan, Pierre R. Villeneuve, J. D. Joannopoulos, and H. A. Haus Annular Electroconvection with Shear . ................................................................................... 964 Zahir A. Daya, V. B. Deyirmenjian, Stephen W. Morris, and John R. de Bruyn Shape Complexity in Turbulence . ......................................................................................... 968 Haris J. Catrakis and Paul E. Dimotakis Nonlinear Hydrodynamic Stability ......................................................................................... 972 M. B. Isichenko Plasma and Beam Physics Laser-Electron Storage Ring ............................................................................................... 976 Zhirong Huang and Ronald D. Ruth Condensed Matter: Structure, Etc. Manifestation of Quantum Chaos in Scattering Techniques: Application to Low-Energy and Photoelectron Diffraction Intensities .............................................................................................................. 980 P. L. de Andres and J. A. Vergés Coarsening of Self-Assembled Ge Quantum Dots on Si(001) . ............................................................ 984 F. M. Ross, J. Tersoff, and R. M. Tromp Nanoscale Templating of One-Dimensional Surface Molecular Structures . ................................................ 988 P. W. Murray, I. M. Brookes, S. A. Haycock, and G. Thornton Molecular Dynamics Simulation of Structural Formation of Short Polymer Chains . .................................... 991 Susumu Fujiwara and Tetsuya Sato Enhancement of Surface Hardness: Boron on Diamond (111) ............................................................ 995 Seungwu Han, Jisoon Ihm, Steven G. Louie, and Marvin L. Cohen Logarithmic Kinetics of the Amorphous-Amorphous Transformations in SiO2 and GeO2 Glasses under High Pressure . 999 O. B. Tsiok, V. V. Brazhkin, A. G. Lyapin, and L. G. Khvostantsev Critical Behavior in Disordered Quantum Systems Modified by Broken Time-Reversal Symmetry ...................... 1003 M. S. Hussein and M. P. Pato Universal Dynamics of Independent Critical Relaxation Modes .......................................................... 1007 M. P. Nightingale and H. W. J. Blöte Noncoarsening Origin of Logarithmic-Normal Size Distributions during Crystallization of Amorphous Thin Films ...... 1011 Ralf B. Bergmann, Frank G. Shi, and Jörg Krinke First Low-Temperature Radiotracer Studies of Diffusion in Icosahedral Quasicrystals ................................... 1014 Renate Blüher, Peter Scharwaechter, Werner Frank, and Helmut Kronmüller Correlation between the Activation Energies for Ionic Conductivity for Short and Long Time Scales and the Kohlrausch Stretching Parameter b for Ionically Conducting Solids and Melts . ................................... 1018 K. L. Ngai, G. N. Greaves, and C. T. Moynihan Formation of Self-Assembled Quantum Wires during Epitaxial Growth of Strained GeSn Alloys on Ge(100): Trench Excavation by Migrating Sn Islands .................................................................................. 1022 X. Deng, B.-K. Yang, S. A. Hackney, M. Krishnamurthy, and D. R. M. Williams Quantum-Size Effects on the Pattern Formation of Monatomic-Layer-High Metal Islands on Surfaces .................. 1026 Kui-juan Jin, Gerald D. Mahan, Horia Metiu, and Zhenyu Zhang (Continued on Preceding Page) Contents (Continued) Condensed Matter: Electronic Properties, Etc. Scarred and Chaotic Field Distributions in a Three-Dimensional Sinai-Microwave Resonator ............................ 1030 U. Dörr, H.-J. Stöckmann, M. Barth, and U. Kuhl The Hubbard Quantum Wire ............................................................................................. 1034 You-Quan Li and Christian Gruber Scaling and Universality in the Anisotropic Kondo Model and the Dissipative Two-State System ....................... 1038 T. A. Costi Thermoelectric Power of Single-Walled Carbon Nanotubes . ........................................................... 1042 J. Hone, I. Ellwood, M. Muno, Ari Mizel, Marvin L. Cohen, A. Zettl, Andrew G. Rinzler, and R. E. Smalley Electron-Hole Coherence and Charging Effects in Ultrasmall Metallic Grains . ......................................... 1046 S. Drewes, S. R. Renn, and F. Guinea Ensemble-Average Spectrum of Aharonov-Bohm Conductance Oscillations: Evidence for Spin-Orbit-Induced Berry’s Phase ......................................................................................................... 1050 A. F. Morpurgo, J. P. Heida, T. M. Klapwijk, B. J. van Wees, and G. Borghs Enhanced Shot Noise in Resonant Tunneling: Theory and Experiment . ............................................... 1054 G. Iannaccone, G. Lombardi, M. Macucci, and B. Pellegrini Magnetoresistance Oscillations due to Charging Effects in Double Ferromagnetic Tunnel Junctions . .................. 1058 J. Barnas´ and A. Fert Continuum of Chiral Luttinger Liquids at the Fractional Quantum Hall Edge . ......................................... 1062 M. Grayson, D. C. Tsui, L. N. Pfeiffer, K. W. West, and A. M. Chang Microscopic Origin of Conducting Channels in Metallic Atomic-Size Contacts . ......................................... 1066 J. C. Cuevas, A. Levy Yeyati, and A. Martı´n-Rodero Pinned Vortex Liquid above the Critical Point of the First-Order Melting Transition: A Consequence of Pointlike Disorder .............................................................................................................. 1070 D. López, L. Krusin-Elbaum, H. Safar, E. Righi, F. de la Cruz, S. Grigera, C. Feild, W. K. Kwok, L. Paulius, and G. W. Crabtree Superconducting PrBa2Cu3Ox ............................................................................................ 1074 Zhigang Zou, Jinhua Ye, Kunihiko Oka, and Yoshikazu Nishihara Vortex Pinning and Stability in the Low Field, Superconducting Phases of UPt3