Accepted Papers for Phys. Rev. Lett. http://prl.aps.org/ Accepted Papers for Physical Review Letters en-us Copyright (c) 2008 The American Physical Society 2008-07-20T21:00:23-04:00 assocpub@aps.org rss@aps.org hourly 4 2008-07-20T21:00:23-04:00 rss@aps.org Observation of the bottomonium ground state in the decay \Upsilon(3S) \rightarrow \gamma \eta_{b} http://prl.aps.org/accepted/L/63079Y9fHa415b1db1f16dc8e21e7527ab7b6e1a7 We report the results of a search for the bottomonium ground state hb(1S) in the photon energy spectrum with a sample of (109 1) million of U(3S) recorded at the U(3S) energy with the &nbsp;detector at the PEP-II B factory at SLAC. We observe a peak in the photon energy spectrum at Eg = 921.2 +2.1-2... B. Aubert, M. Bona, Y. Karyotakis, J. P. Lees, V. Poireau, E. Prencipe, X. Prudent, V. Tisserand, Garra Tico J., E. Grauges, L. Lopez, A. Palano, M. Pappagallo, G. Eigen, B. Stugu, L. Sun, G. S. Abrams, M. Battaglia, D. N. Brown, R. N. Cahn, R. G. Jacobsen, L. T. Kerth, Yu. G. Kolomensky and G. Lynch 2008-07-18T00:00:00-04:00 Personal use only, all commercial or other reuse prohibited article Physical Review Letters Elementary Particles and Fields Elementary Particles and Fields Spin accumulation and spin relaxation in a large open quantum dot http://prl.aps.org/accepted/L/a107fYc3A901fe14e2d61bb0c9e38e310fac4f5ea We report electronic control and measurement of an imbalance between spin-up and spin-down electrons in micron-scale open quantum dots. Spin injection and detection was achieved with quantum point contacts tuned to have spin-selective transport, with four contacts per dot for realizing a non-local s... E. J. Koop, van Wees B. van Wees B. J., D. Reuter, A. D. Wieck and van der Wal C. van der Wal C. H. 2008-07-18T00:00:00-04:00 Personal use only, all commercial or other reuse prohibited article Physical Review Letters Condensed Matter: Electronic Properties, etc. Condensed Matter: Electronic Properties, etc. Universal long time behavior of nuclear spin decays in a solid http://prl.aps.org/accepted/L/d5074Y42Cee1bb1e84c909c1af501eac66623d2f8 Magnetic resonance studies of nuclear spins in solids are exceptionally well suited to probe the limits of statistical physics. We report experimental results indicating that isolated macroscopic systems of interacting nuclear spins possess the following fundamental property: spin decays that start ... S. W. Morgan, B. V. Fine and B. Saam 2008-07-18T00:00:00-04:00 Personal use only, all commercial or other reuse prohibited article Physical Review Letters Condensed Matter: Electronic Properties, etc. Condensed Matter: Electronic Properties, etc. Origin of the 150-K anomaly in LaFeAsO: Competing antiferromagnetic interactions, frustration, and a structural phase transition http://prl.aps.org/accepted/L/c0070Y58Ea511815b32d8c773d5484567d4d345e6 From first principles calculations we find that the effective nearest and next nearest neighbor magnetic interactions between Fe ions in LaOFeAs are large, antiferromagnetic (AF), and give rise to a frustrated magnetic ground state which consists of two interpenerating AF square sublattices (i.e. st... T. Yildirim 2008-07-18T00:00:00-04:00 Personal use only, all commercial or other reuse prohibited article Physical Review Letters Condensed Matter: Electronic Properties, etc. Condensed Matter: Electronic Properties, etc. Equivalence of glass transition temperatures in polymer nanocomposites and polymer thin films http://prl.aps.org/accepted/L/c707dYe8Fbc1681cd03e913764af574455096dff4 Motivated by recent experiments, we examine within a percolation model whether there is a quantitative equivalence in the glass transition temperatures (Tg) of polymer thin films and polymer nanocomposites (PNCs). Our results indicate that while the qualitative behaviors of these systems are similar... Jamie M. Kropka, Victor Pryamitsyn and Venkat Ganesan 2008-07-18T00:00:00-04:00 Personal use only, all commercial or other reuse prohibited article Physical Review Letters Condensed Matter: Structure, etc. Condensed Matter: Structure, etc. Effective masses in a strongly anisotropic Fermi liquid http://prl.aps.org/accepted/L/2207bYeaEb615e0e399b39451a965734beebe09ad Motivated by the recent experimental observation of quantum oscillations in the underdoped cuprates, we study the cyclotron and infrared Hall effective masses in an anisotropic Fermi liquid characterized by an angle-dependent quasiparticle residue Zq. Our primary motivation is to explain the relativ... Tudor D. Stanescu, Victor Galitski and H. D. Drew 2008-07-18T00:00:00-04:00 Personal use only, all commercial or other reuse prohibited article Physical Review Letters Condensed Matter: Electronic Properties, etc. Condensed Matter: Electronic Properties, etc. Search for decay of a fermiophobic Higgs boson h_{f}\rightarrow\gamma\gamma with the D0 detector at \sqrt{s}=1.96 TeV http://prl.aps.org/accepted/L/af072Y2cDb917c1b63537d083a4a304e1562b16d0 We report the results of a search for a narrow resonance decaying into two photons in 1.1 fb-1 of data collected by the experiment at the Fermilab Tevatron Collider during the period 2002-2006. We find no evidence for such a resonance and set a lower limit on the mass of a fermiophobic Higgs boson o... V. M. Abazov, B. Abbott, M. Abolins, B. S. Acharya, M. Adams, T. Adams, E. Aguilo, S. H. Ahn, M. Ahsan, G. D. Alexeev, G. Alkhazov, A. Alton, G. Alverson, G. A. Alves, M. Anastasoaie, L. S. Ancu, T. Andeen, S. Anderson, B. Andrieu, M. S. Anzelc, M. Aoki, Y. Arnoud, M. Arov and M. Arthaud 2008-07-18T00:00:00-04:00 Personal use only, all commercial or other reuse prohibited article Physical Review Letters Elementary Particles and Fields Elementary Particles and Fields New dynamics in cerebellar Purkinje cells: Torus canards http://prl.aps.org/accepted/L/ea07bYdaD5b1a11ec8b63db46349f2e24f5e6a987 We describe a transition from bursting to rapid spiking in a reduced mathematical model of a cerebellar Purkinje cell. We perform a slow-fast analysis of the system and find that - after a saddle node bifurcation of limit cycles - the full model dynamics follow temporarily a repelling branch of limi... Mark A. Kramer, Roger D. Traub and Nancy J. Kopell 2008-07-18T00:00:00-04:00 Personal use only, all commercial or other reuse prohibited article Physical Review Letters Soft Matter, Biological, and Interdisciplinary Physics Soft Matter, Biological, and Interdisciplinary Physics Dielectric function of the QCD vacuum http://prl.aps.org/accepted/L/1b07cY91D1016a1a517a8bd126c878f9a5f7acb75 It is shown that the inverse of the ghost form factor in the Hamilton approach to Yang-Mills theory in Coulomb gauge can be interpreted as the color dielectric function of the QCD vacuum. Furthermore the horizon condition to the ghost form factor implies that in the infrared the QCD vacuum is a perf... H. Reinhardt 2008-07-18T00:00:00-04:00 Personal use only, all commercial or other reuse prohibited article Physical Review Letters Elementary Particles and Fields Elementary Particles and Fields Deconfined criticality: Generic first order transition in the SU(2) symmetry case http://prl.aps.org/accepted/L/0b075Y2bF311781db84808072caa75cf72bdfe16f Monte Carlo simulations of the SU(2)-symmetric deconfined critical point action reveal strong violations of scale invariance for the deconfinement transition. We find compelling evidence that the generic runaway renormalization flow of the gauge coupling is to a weak first order transition, similar ... A. B. Kuklov, M. Matsumoto, N. V. Prokofev, B. V. Svistunov and M. Troyer 2008-07-18T00:00:00-04:00 Personal use only, all commercial or other reuse prohibited article Physical Review Letters General Physics: Statistical and Quantum Mechanics, Quantum Information, etc. General Physics: Statistical and Quantum Mechanics, Quantum Information, etc. Nonadiabadic charge pumping in a hybrid single electron transistor http://prl.aps.org/accepted/L/89071Y6fC361ae1720014b93283d79b32c4ea0ef3 We study theoretically current quantization in the charge turnstile based on the hybrid (SINIS or NISIN) SET transistor. The quantization accuracy is limited by either Andreev reflection or by Cooper pair - electron cotunneling. The rates of these processes are calculated in the "above-the-threshold... Dmitri V. Averin and Jukka P. Pekola 2008-07-18T00:00:00-04:00 Personal use only, all commercial or other reuse prohibited article Physical Review Letters Condensed Matter: Electronic Properties, etc. Condensed Matter: Electronic Properties, etc. Quantum and classical glass transitions in LiHo_{x}Y_{1-x}F_{4} http://prl.aps.org/accepted/L/fd074Ye9Ade12a1f71001b046511ac98d1457d31e When performed in the proper low field, low frequency limits, measurements of the dynamics and the nonlinear susceptibility in the model Ising magnet in transverse field, \textLiHox\textY1-x\textF4, prove the existence of a spin glass transition for x = 0.167 and 0.198. The classical behavior tracks... C. Ancona Torres, D. M. Silevitch, G. Aeppli and T. F. Rosenbaum 2008-07-18T00:00:00-04:00 Personal use only, all commercial or other reuse prohibited article Physical Review Letters Condensed Matter: Electronic Properties, etc. Condensed Matter: Electronic Properties, etc. Exploring local quantum many body relaxation by atoms in optical superlattices http://prl.aps.org/accepted/L/e507dY48Fd613a1752467b0459bdde8bf70837f34 We establish a setting-atoms in optical superlattices with period 2-in which one can experimentally probe signatures of the process of local relaxation and apparent thermalization in non-equilibrium dynamics without the need of addressing single sites. This opens up a way to explore the convergence ... M. Cramer, A. Flesch, I. P. McCulloch, U. Schollwock and J. Eisert 2008-07-18T00:00:00-04:00 Personal use only, all commercial or other reuse prohibited article Physical Review Letters Atomic, Molecular, and Optical Physics Atomic, Molecular, and Optical Physics Coulomb blockade and superuniversality of the \theta angle http://prl.aps.org/accepted/L/34079Y7dO6d1871e92fe6390a9f00f0dfc3f1c5cf Based on the Ambegaokar-Eckern-Sch&#246;n approach to the Coulomb blockade we develop a complete quantum theory of the single electron transistor. We identify a previously unrecognized physical observable in the problem that, unlike the usual average charge on the island, is robustly quantized for a... I. S. Burmistrov and A. M. M. Pruisken 2008-07-18T00:00:00-04:00 Personal use only, all commercial or other reuse prohibited article Physical Review Letters Condensed Matter: Electronic Properties, etc. Condensed Matter: Electronic Properties, etc. Attosecond photoelectron spectroscopy of electron tunneling in a dissociating hydrogen molecular ion http://prl.aps.org/accepted/L/9d071Y66C411461763a64351112abdab397899d2c We demonstrate the potential of intense-field pump - attosecond probe photo-electron spectroscopy to monitor electron tunneling between the two protons during dissociative ionization of the hydrogen molecule, with attosecond temporal and Angstrom-scale spatial resolution. Stefanie Grafe, Volker Engel and Misha Yu. Ivanov 2008-07-18T00:00:00-04:00 Personal use only, all commercial or other reuse prohibited article Physical Review Letters Atomic, Molecular, and Optical Physics Atomic, Molecular, and Optical Physics Self trapping of bosons and fermions in optical lattices http://prl.aps.org/accepted/L/58074Y90Y7518a1b331c62e9773ca7b3dc6edf00f We theoretically investigate the enhanced localization of bosonic atoms by fermionic atoms in three-dimensional optical lattices and find a self-trapping of the bosons for attractive boson-fermion interaction. Due to this mutual interaction, the fermion orbitals are substantially squeezed, which res... DirkSoren Luhmann, Kai Bongs, Klaus Sengstock and Daniela Pfannkuche 2008-07-18T00:00:00-04:00 Personal use only, all commercial or other reuse prohibited article Physical Review Letters General Physics: Statistical and Quantum Mechanics, Quantum Information, etc. General Physics: Statistical and Quantum Mechanics, Quantum Information, etc. How metallic Fe controls the composition of its native oxide http://prl.aps.org/accepted/L/db076Y3cE6d12110644f5095ba20b38b2f0963bdb We have studied in-situ the oxidation of ultrathin iron layers and monitored the chemical changes induced by subsequent deposition of Fe metal using hard X-ray absorption spectroscopy. The site sensitivity of the technique allows to quantify the composition of the layer throughout the oxidation/depo... Sebastien Couet, Kai Schlage, Karel Saksl and Ralf Rohlsberger 2008-07-18T00:00:00-04:00 Personal use only, all commercial or other reuse prohibited article Physical Review Letters Condensed Matter: Structure, etc. Condensed Matter: Structure, etc. Quantum differences between heavy and light water http://prl.aps.org/accepted/L/78077Ye3Ce710f08397760c92ab5fa367c5469e2f The structures of heavy and light water at ambient conditions are investigated with the combined techniques of x-ray diffraction, neutron diffraction and computer simulation. It is found that heavy water is a more structured liquid than light water. We find the OH bond length in H2O is ~ 3% longer t... A. K. Soper and C. J. Benmore 2008-07-18T00:00:00-04:00 Personal use only, all commercial or other reuse prohibited article Physical Review Letters Condensed Matter: Structure, etc. Condensed Matter: Structure, etc. Controlling the spontaneous emission of a superconducting transmon qubit http://prl.aps.org/accepted/L/58070Y81D1211a13f9162e21bbe5b4b281f830de7 We present a detailed characterization of coherence in seven transmon qubits in a circuit QED architecture. We find that spontaneous emission rates are strongly influenced by far off-resonant modes of the cavity and can be understood within a semiclassical circuit model. A careful analysis of the sp... A. A. Houck, J. A. Schreier, B. R. Johnson, J. M. Chow, Jens Koch, J. M. Gambetta, D. I. Schuster, L. Frunzio, M. H. Devoret, S. M. Girvin and R. J. Schoelkopf 2008-07-18T00:00:00-04:00 Personal use only, all commercial or other reuse prohibited article Physical Review Letters General Physics: Statistical and Quantum Mechanics, Quantum Information, etc. General Physics: Statistical and Quantum Mechanics, Quantum Information, etc. Temperature dependent transport in suspended graphene http://prl.aps.org/accepted/L/4e07cY13E551851a76bb3fd08a6ea1feea2798a36 The resistivity of ultra-clean suspended graphene is strongly temperature (T) dependent for 5&nbsp;K < T < 240&nbsp;K. At T ~ 5&nbsp;K transport is near-ballistic in a device of ~ 2&nbsp;mm dimension and a mobility ~ 170,000&nbsp;cm2/Vs. At large carrier density, n > 0.5&times;1011cm-2, the resistivity increases with increasing T and is linear above 50 K, suggesting carrier scattering from acoustic phonons. At T=240&nbsp;K the mobility is ~ 120,000&nbsp;cm2/Vs, ... K. I. Bolotin, K. J. Sikes, J. Hone, H. L. Stormer and P. Kim 2008-07-17T00:00:00-04:00 Personal use only, all commercial or other reuse prohibited article Physical Review Letters Condensed Matter: Electronic Properties, etc. Condensed Matter: Electronic Properties, etc. Unconventional superconductivity with a sign reversal in the order parameter of LaFeAsO_{1-x}F_{x} http://prl.aps.org/accepted/L/34078Y31Deb1281045ae5272702ebd110bcf6951f We argue that the newly discovered superconductivity in a nearly magnetic, Fe-based layered compound is unconventional and mediated by antiferromagnetic spin fluctuations, though different from the usual superexchange and specific to this compound. This resulting state is an example of extended s-wa... I. I. Mazin, D. J. Singh, M. D. Johannes and Du M. H. 2008-07-17T00:00:00-04:00 Personal use only, all commercial or other reuse prohibited article Physical Review Letters Condensed Matter: Electronic Properties, etc. Condensed Matter: Electronic Properties, etc. Neutral clustering in a simple experimental ecological community http://prl.aps.org/accepted/L/3a075Y04D5510414c87427a816787bf6615b815c1 The spatial distribution of most species in ecosystems is non-uniform. New theories try to explain patterns observed at multiple scales in terms of neutral processes such as birth, death and migration. We have devised an experimental, niche-free ecosystem where the amplitude of neutral patchiness ca... B. Houchmandzadeh 2008-07-17T00:00:00-04:00 Personal use only, all commercial or other reuse prohibited article Physical Review Letters Soft Matter, Biological, and Interdisciplinary Physics Soft Matter, Biological, and Interdisciplinary Physics Universal elastic anisotropy index http://prl.aps.org/accepted/L/62079Y7dFae1601a53fa48a18a813e19c69163b1b Practically all elastic single crystals are anisotropic, which calls for an appropriate universal measure to quantify the extent of anisotropy. A review of the existing anisotropy measures - due to (i) Zener \tthciteob\tthcitecb, (ii) Chung and Buessem \tthciteob\tthcitecb and (iii) Ledbetter and Mi... Shivakumar I. Ranganathan and Martin Ostoja Starzewski 2008-07-17T00:00:00-04:00 Personal use only, all commercial or other reuse prohibited article Physical Review Letters Condensed Matter: Structure, etc. Condensed Matter: Structure, etc. Quantum circuit architecture http://prl.aps.org/accepted/L/d4070Y5dZ8c1891c163369d47bfb6cfd34218eb00 We present a method for optimizing quantum circuits architecture, based on the notion of quantum comb, which describes a circuit board where one can insert variable subcircuits. Unexplored quantum processing tasks, such as cloning and storing-retrieving of gates can be optimized, along with setups f... G. Chiribella, G. M. DAriano and P. Perinotti 2008-07-17T00:00:00-04:00 Personal use only, all commercial or other reuse prohibited article Physical Review Letters General Physics: Statistical and Quantum Mechanics, Quantum Information, etc. General Physics: Statistical and Quantum Mechanics, Quantum Information, etc. Band dependent normal state coherence in Sr_{2}RuO_{4}: Evidence from Nernst effect and thermopower measurements http://prl.aps.org/accepted/L/b8070Y4eA941621643d043949169255056e61370a We present the first measurement on Nernst effect in the normal state of odd-parity, spin-triplet superconductor Sr2RuO4. Below 100 K, the Nernst signal was found to be negative, large, and, as a function of magnetic field, nonlinear. Its magnitude increases with the decreasing temperature until rea... Xu X. F., Xu Z. A., T. J. Liu, D. Fobes, Z. Q. Mao, J. L. Luo and Y. Liu 2008-07-17T00:00:00-04:00 Personal use only, all commercial or other reuse prohibited article Physical Review Letters Condensed Matter: Electronic Properties, etc. Condensed Matter: Electronic Properties, etc.