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NEWSPAPER

Two thin filaments undulate in a downward flowing soap film. Center panels display the filament amplitudes and separation, outer panels show their instantaneous wake. Unlike rigid objects, the leading filament experiences less drag than its follower. See article 194502. PHYSICAL REVIEW LETTERS Contents Articles published 1 November–7 November 2008

VOLUME 101, NUMBER 19 7 November 2008

General Physics: Statistical and Quantum Mechanics, Quantum Information, etc. States of the Dirac Equation in Confining Potentials ...... 190401 Riccardo Giachetti and Emanuele Sorace Efficient Hidden-Variable of Measurements in Quantum Experiments ...... 190402 Borivoje Dakic´, Milovan Sˇuvakov, Tomasz Paterek, and Cˇ aslav Brukner Foundation of Statistical Mechanics under Experimentally Realistic Conditions ...... 190403 Peter Reimann Stable Suspension and Dispersion-Induced Transitions from Repulsive Casimir Forces Between Fluid-Separated Eccentric Cylinders ...... 190404 Alejandro W. Rodriguez, J. N. Munday, J. D. Joannopoulos, Federico Capasso, Diego A. Dalvit, and Steven G. Johnson Magnetic Dipolar Interaction in a Bose-Einstein Condensate Atomic Interferometer ...... 190405 M. Fattori, G. Roati, B. Deissler, C. D’Errico, M. Zaccanti, M. Jona-Lasinio, L. Santos, M. Inguscio, and G. Modugno Long-Range Correlations of Density in a Bose-Einstein Condensate Expanding in a Random Potential ...... 190406 N. Cherroret and S. E. Skipetrov Generation of Narrow-Band Polarization-Entangled Photon Pairs for Atomic Quantum Memories ...... 190501 Xiao-Hui Bao, Yong Qian, Jian Yang, Han Zhang, Zeng-Bing Chen, Tao Yang, and Jian-Wei Pan Quantum Tomography of a Strongly Driven Qubit ...... 190502 M. S. Rudner, A. V. Shytov, L. S. Levitov, D. M. Berns, W. D. Oliver, S. O. Valenzuela, and T. P. Orlando Novel Schemes for Directly Measuring Entanglement of General States ...... 190503 Jianming Cai and Wei Song Single-Photon Excitation of Surface ...... 190504 M. S. Tame, C. Lee, J. Lee, D. Ballester, M. Paternostro, A. V. Zayats, and M. S. Kim Tracking Heterogeneous Dynamics During the Relaxation of a Simple Former ...... 190601 Pinaki Chaudhuri, Srikanth Sastry, and Walter Kob Interplay between Anderson and Stark Localization in 2D Lattices ...... 190602 A. R. Kolovsky Critical Asymmetry for Giant Diffusion of Active Brownian Particles ...... 190603 Benjamin Lindner and Ernesto M. Nicola

Gravitation and Astrophysics Coulomb Suppression of the Stellar Enhancement Factor ...... 191101 G. G. Kiss, T. Rauscher, Gy. Gyu¨rky, A. Simon, Zs. Fu¨lo¨p, and E. Somorjai

Elementary Particles and Fields Colorful Horizons with Charge in Anti–de Sitter Space ...... 191601 Steven S. Gubser

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Copyright 2008 by The American Physical Society

0031-9007(20081107)101:19;1-D Contents (Continued)

2 eff  Measurement of the Forward-Backwardp Charge Asymmetry and Extraction of sin W in pp ! Z= ‡ X ! e‡eÿ ‡ X Events Produced at s 1:96 TeV ...... 191801 V.M. Abazov et al. (The D0 Collaboration) New Measurement of the K‡ ! ‡ Branching Ratio ...... 191802 A. V. Artamonov et al. (E949 Collaboration) Observation of 2S!1S and Search for Related Transitions ...... 192001 Q. He et al. (CLEO Collaboration) p Search for the Flavor-Changing Neutral-Current Decay t ! Zq in pp Collisions at s 1:96 TeV ...... 192002 T. Aaltonen et al. (CDF Collaboration)

Atomic, Molecular, and Optical Physics Locating Multiple Self-Consistent Field Solutions: An Approach Inspired by Metadynamics ...... 193001 Alex J. Thom and Martin Head-Gordon Polarization Control in Two-Color Above-Threshold Ionization of Atomic Helium ...... 193002 M. Meyer, D. Cubaynes, D. Glijer, J. Dardis, P. Hayden, P. Hough, V. Richardson, E. T. Kennedy, J. T. Costello, P. Radcliffe, S. Du¨sterer, A. Azima, W. B. Li, H. Redlin, J. Feldhaus, R. Taı¨eb, A. Maquet, A. N. Grum-Grzhimailo, E. V. Gryzlova, and S. I. Strakhova Strong Field Ionization Rate for Arbitrary Laser Frequencies ...... 193003 S. V. Popruzhenko, V.D. Mur, V.S. Popov, and D. Bauer Orthopositronium Lifetime: Analytic Results in O and O3 ln ...... 193401 Bernd A. Kniehl, Anatoly V. Kotikov, and Oleg L. Veretin Frequency Shifts in an Optical Lattice Clock Due to Magnetic-Dipole and Electric-Quadrupole Transitions ...... 193601 A. V. Taichenachev, V.I. Yudin, V.D. Ovsiannikov, V.G. Pal’chikov, and C. W. Oates

Nonlinear Dynamics, Fluid Dynamics, Classical Optics, etc. Effect of Nonlinearity on Adiabatic Evolution of Light ...... 193901 Y. Lahini, F. Pozzi, M. Sorel, R. Morandotti, D. N. Christodoulides, and Y. Silberberg Optical Bloch Oscillations and Zener Tunneling with Nonclassical Light ...... 193902 Stefano Longhi Antisymmetric Polar Modes of Thermal Convection in Rotating Spherical Fluid Shells at High Taylor Numbers . . . . 194501 Ferran Garcia, Juan Sa´nchez, and Marta Net Anomalous Hydrodynamic Drafting of Interacting Flapping Flags ...... 194502 Leif Ristroph and Jun Zhang Electrorheological Fluid Dynamics ...... 194503 Jianwei Zhang, Xiuqing Gong, Chun Liu, Weijia Wen, and Ping Sheng Turbulence-Condensate Interaction in Two Dimensions ...... 194504 H. Xia, H. Punzmann, G. Falkovich, and M. G. Shats Is the Scaling of Supersonic Turbulence Universal? ...... 194505 Wolfram Schmidt, Christoph Federrath, and Ralf Klessen

Plasma and Beam Physics Probing the Hydrogen Melting Line at High Pressures by Dynamic Compression ...... 194801 A. Grinenko, D. O. Gericke, S. H. Glenzer, and J. Vorberger Evidence from Numerical of Transport-Barrier Relaxations in Tokamak Edge Plasmas in the Presence of Electromagnetic Fluctuations ...... 195001 G. Fuhr, P. Beyer, S. Benkadda, and X. Garbet Observation of an Ultracold Instability ...... 195002 X. L. Zhang, R. S. Fletcher, and S. L. Rolston Dusty-Plasma in the Statistical Theory of the Liquid State ...... 195003 V.E. Fortov, O. F. Petrov, and O. S. Vaulina Resonance Cone Interaction With a Self-Consistent Radio-Frequency Sheath ...... 195004 J. R. Myra and D. A. D’Ippolito

(Continued on Preceding Page) By suggesting a few manuscripts each week, we hope to promote reading across fields. Please see our Announcement Phys. Rev. Lett. 98, 010001 (2007). Contents (Continued)

Observation of Plasma Rotation Driven by Static Nonaxisymmetric Magnetic Fields in a Tokamak ...... 195005 A. M. Garofalo, K. H. Burrell, J. C. DeBoo, J. S. deGrassie, G. L. Jackson, M. Lanctot, H. Reimerdes, M. J. Schaffer, W. M. Solomon, and E. J. Strait

Condensed Matter: Structure, etc. Torsional Stick-Slip Behavior in WS2 Nanotubes ...... 195501 K. S. Nagapriya, Ohad Goldbart, Ifat Kaplan-Ashiri, Gotthard Seifert, Reshef Tenne, and Ernesto Joselevich Spectroscopic Signatures of Novel Oxygen-Defect Complexes in Stoichiometrically Controlled CdSe ...... 195502 G. Chen, J. S. Bhosale, I. Miotkowski, and A. K. Ramdas Mixed Mobile Ion Effect and Cooperative Motions in Silver-Sodium Phosphate ...... 195901 Andreas Hall, Jan Swenson, Stefan Adams, and Carlo Meneghini Electron Damage to Supported Ice Investigated by Scanning Tunneling Microscopy and Spectroscopy ...... 196101 Michael Mehlhorn, Heiko Gawronski, and Karina Morgenstern Geometric Principles of Surface Growth ...... 196102 Carlos Escudero Dual-Surfactant Effect to Enhance p-Type Doping in III-V Thin Films ...... 196103 J. Y. Zhu, Feng Liu, and G. B. Stringfellow

Condensed Matter: Electronic Properties, etc. Steady-State Nonequilibrium of Driven Strongly Correlated Lattice Models in Infinite Dimensions . 196401 A. V. Joura, J. K. Freericks, and Th. Pruschke Field-Induced -Ice-Like Orders in Spin Liquid Tb2Ti2O7 ...... 196402 H. Cao, A. Gukasov, I. Mirebeau, P. Bonville, and G. Dhalenne. Coulomb Barrier for Charge Separation at an Organic Semiconductor Interface ...... 196403 Matthias Muntwiler, Qingxin Yang, William A. Tisdale, and X.-Y. Zhu Coherent Particle Transfer in an On-Demand Single-Electron Source ...... 196404 J. Keeling, A. V. Shytov, and L. S. Levitov Measurement of the Optical Conductivity of Graphene ...... 196405 Kin Fai Mak, Matthew Y. Sfeir, Yang Wu, Chun Hung Lui, James A. Misewich, and Tony F. Heinz STM Images of Subsurface Mn Atoms in GaAs: Evidence of Hybridization of Surface and Impurity States ...... 196801 J.-M. Jancu, J.-Ch. Girard, M. O. Nestoklon, A. Lemaıˆtre, F. Glas, Z. Z. Wang, and P. Voisin Pfaffian Statistics through Adiabatic Transport in the 1D Coherent State Representation ...... 196802 Alexander Seidel Adsorbate-Limited Conductivity of Graphene ...... 196803 John P. Robinson, Henning Schomerus, La´szlo´ Oroszla´ny, and Vladimir I. Fal’ko Unscreened Coulomb Interactions and the Quantum Spin Hall Phase in Neutral Zigzag Graphene Ribbons ...... 196804 Mahdi Zarea, Carlos Bu¨sser, and Nancy Sandler Tunable Spin Gaps in a Quantum-Confined Geometry ...... 196805 Emmanouil Frantzeskakis, Ste´phane Pons, Hossein Mirhosseini, Ju¨rgen Henk, Christian R. Ast, and Marco Grioni Magnetic Dispersion of the Diagonal Incommensurate Phase in Lightly Doped La2ÿxSrxCuO4 ...... 197001 M. Matsuda, M. Fujita, S. Wakimoto, J. A. Fernandez-Baca, J. M. Tranquada, and K. Yamada Current Induced Decomposition of Abrikosov Vortices in p-n Layered Superconductors and Heterostructures ...... 197002 A. L. Rakhmanov, Sergey Savel’ev, and F. V. Kusmartsev Na4Ir3O8 as a 3D Spin Liquid with Fermionic Spinons ...... 197201 Yi Zhou, Patrick A. Lee, Tai-Kai Ng, and Fu-Chun Zhang Gapless Spin on the Three-Dimensional Hyperkagome Lattice of Na4Ir3O8 ...... 197202 Michael J. Lawler, Arun Paramekanti, Yong Baek Kim, and Leon Balents Dynamical Backaction of Microwave Fields on a Nanomechanical Oscillator ...... 197203 J. D. Teufel, J. W. Harlow, C. A. Regal, and K. W. Lehnert Polarization Selective Magnetic Vortex Dynamics and Core Reversal in Rotating Magnetic Fields ...... 197204 Michael Curcic, Bartel Van Waeyenberge, Arne Vansteenkiste, Markus Weigand, Vitalij Sackmann, Hermann Stoll, Manfred Fa¨hnle, Tolek Tyliszczak, Georg Woltersdorf, Christian H. Back, and Gisela Schu¨tz

(Continued on Preceding Page) By suggesting a few manuscripts each week, we hope to promote reading across fields. Please see our Announcement Phys. Rev. Lett. 98, 010001 (2007). Contents (Continued)

Evidence for Universal Scaling in the Spin-Glass Phase ...... 197205 Thomas Jo¨rg and Helmut G. Katzgraber Magnetic Bistability and Nucleation of Magnetic Bubbles in a Layered 2D Organic-Based FeTCNENCMe2FeCl4 ...... 197206 Jung-Woo Yoo, V.N. Prigodin, W. W. Shum, K. I. Pokhodnya, Joel S. Miller, and A. J. Epstein Rotation of an Electric Polarization Vector by Rotating in Cycloidal Magnet Eu0:55Y0:45MnO3 ...... 197207 H. Murakawa, Y. Onose, F. Kagawa, S. Ishiwata, Y. Kaneko, and Y. Tokura Probing Superexchange Interaction in Molecular by Spin-Flip Spectroscopy and Microscopy ...... 197208 Xi Chen, Ying-Shuang Fu, Shuai-Hua Ji, Tong Zhang, Peng Cheng, Xu-Cun Ma, Xiao-Long Zou, Wen-Hui Duan, Jin-Feng Jia, and Qi-Kun Xue Constructing an Array of Anchored Single-Molecule Rotors on Gold Surfaces ...... 197209 L. Gao, Q. Liu, Y.Y. Zhang, N. Jiang, H. G. Zhang, Z. H. Cheng, W. F. Qiu, S. X. Du, Y.Q. Liu, W. A. Hofer, and H.-J. Gao Fano Profiles Induced by Near-Field Coupling in Heterogeneous Dimers of Gold and Silver Nanoparticles ...... 197401 G. Bachelier, I. Russier-Antoine, E. Benichou, C. Jonin, N. Del Fatti, F. Valle´e, and P.-F. Brevet -Induced Coupling between Light and Terahertz-Frequency Acoustic in BaTiO3=SrTiO3 Superlattices ...... 197402 A. Bruchhausen, A. Fainstein, A. Soukiassian, D. G. Schlom, X. X. Xi, M. Bernhagen, P. Reiche, and R. Uecker Electronic and Mechanical Coupling of Carbon Nanotubes: A Tunable Resonant Raman Study of Systems with Known Structures ...... 197403 A. De´barre, M. Kobylko, A. M. Bonnot, A. Richard, V.N. Popov, L. Henrard, and M. Kociak Ultrafast Electronic in La1=2Sr3=2MnO4 by Coherent Vibrational Excitation: Evidence for Nonthermal Melting of Orbital Order ...... 197404 R. I. Tobey, D. Prabhakaran, A. T. Boothroyd, and A. Cavalleri Cooperative Response of PbZrTiO3 Nanoparticles to Curled Electric Fields ...... 197601 Ivan I. Naumov and Huaxiang Fu Nature of Dynamical Coupling between Polarization and Strain in Nanoscale Ferroelectrics from First Principles . . . 197602 I. Ponomareva and L. Bellaiche

Soft Matter, Biological, and Interdisciplinary Physics Experimental Test of Curvature-Driven Dynamics in the Phase Ordering of a Two Dimensional Liquid . . . . . 197801 Alberto Sicilia, Jeferson J. Arenzon, Ingo Dierking, Alan J. Bray, Leticia F. Cugliandolo, Josu Martı´nez-Perdiguero, Ibon Alonso, and Inmaculada C. Pintre Complex Spontaneous Flows and Concentration Banding in Active Polar Films ...... 198101 Luca Giomi, M. Cristina Marchetti, and Tanniemola B. Liverpool Dynamics of Semiflexible Solutions in the Highly Entangled Regime ...... 198301 Manlio Tassieri, R. M. Evans, Lucian Barbu-Tudoran, G. Nasir Khaname, John Trinick, and Tom A. Waigh

Errata Erratum: Dynamics of the and Liquid Phases in Dilute Sheared Brownian Suspensions: Irreversibility and Particle Migration [Phys. Rev. Lett. 99, 240602 (2007)] ...... 199901 J. R. Brown, J. D. Seymour, S. L. Codd, E. O. Fridjonsson, G. R. Cokelet, and M. Nyden

By suggesting a few manuscripts each week, we hope to promote reading across fields. Please see our Announcement Phys. Rev. Lett. 98, 010001 (2007).

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