Filters: Publisher:"American Physical Society" School Or College:"College of Science" Collection:"ir_uspace" Type:"Text"
| Title | Creator | Description | Subject | Date | ||
|---|---|---|---|---|---|---|
| 1 |  | Comment on: New limit on lorentz-invariance- and CPT-violating neutron spin interactions using a free-spin-precession 3He- 129Xe comagnetometer | Saam, Brian | In Ref. [1], the authors use a classical result for the magnetic field created by a uniform magnetization to analyze the effects of magnetic interactions between 3He and 129Xe nuclear spins. We point out that the classical result is not applicable for interaction between nuclear spins: the actual in... | 2014-01-01 | |
| 2 |  | Equilibrium currents in chiral systems with nonzero Chern number | Mishchenko, Eugene | We describe a simple quantum-mechanical approach to calculating equilibrium particle current along the edge of a system with nontrivial band spectrum topology. The approach does not require any a priori knowledge of the band topology and, as a matter of fact, treats topological and nontopological co... | 2014-01-01 | |
| 3 |  | Axion cold dark matter in view of BICEP2 results | Gondolo, Paolo | The properties of axions that constitute 100% of cold dark matter (CDM) depend on the tensor-to-scalar ratio r at the end of inflation. If r ¼ 0.20 þ0.07 −0.05 as reported by the BICEP2 Collaboration, then "half" of the CDM axion parameter space is ruled out. Namely, in the context of single-fie... | 2014-01-01 | |
| 4 |  | Emergent exclusion statistics of quasiparticles in two-dimensional topological phases | Wu, Yong-Shi | We demonstrate how the generalized Pauli exclusion principle emerges for quasiparticle excitations in 2D topological phases. As an example, we examine the Levin-Wen model with the Fibonacci data (specified in the text), and construct the number operator for fluxons living on plaquettes. By numerical... | 2014-01-01 | |
| 5 |  | Mechanisms of spin-dependent dark conductivity in films of a soluble fullerene derivative under bipolar injection | Lupton, John Mark | We report room-temperature pulsed electrically detected magnetic resonance measurements of the dark conductivity of films of the fullerene derivative [6,6]-phenyl-C61-butyric acid methyl ester (PCBM) under bipolar (electron-hole) and unipolar (electron-rich) injection conditions. Directly after mate... | 2014-01-01 | |
| 6 |  | Motor control of sound frequency in birdsong involves the interaction between air sac pressure and labial tension | Goller, Franz | Frequency modulation is a salient acoustic feature of birdsong. Its control is usually attributed to the activity of syringeal muscles, which affect the tension of the labia responsible for sound production. We use experimental and theoretical tools to test the hypothesis that for birds producing to... | 2014-01-01 | |
| 7 |  | Attraction-repulsion transition in the interaction of adatoms and vacancies in graphene | Mishchenko, Eugene | The interaction of two resonant impurities in graphene has been predicted to have a long-range character with weaker repulsion when the two adatoms reside on the same sublattice and stronger attraction when they are on different sublattices. We reveal that this attraction results from a single energ... | 2014-01-01 | |
| 8 |  | Modulation frequency dependence of continuous-wave optically/electrically detected magnetic resonance | Boehme, Christoph | Continuous-wave optically and electrically detected magnetic resonance spectroscopy (cwODMR/cwEDMR) allow the investigation of paramagnetic states involved in spin-dependent transitions, like recombination and transport. Although experimentally similar to conventional electron spin resonance (ESR), ... | 2012-01-01 | |
| 9 |  | Resonant finite-size impurities in graphene, unitary limit, and Friedel oscillations | Mishchenko, Eugene | A unitary limit for model point scatterers in graphene is known to reveal low-energy resonances. The same limit could be achieved from hybridization of band electrons with the localized impurity level positioned in the vicinity of the Fermi level. The finite-size defects represent an easier realizat... | 2012-01-01 | |
| 10 |  | The effect of quark interactions on dark matter kinetic decoupling and the mass of the smallest dark halos | Gondolo, Paolo | The kinetic decoupling of dark matter (DM) from the primordial plasma sets the size of the first and smallest DM halos. Studies of the DM kinetic decoupling have hitherto mostly neglected interactions between the DM and the quarks in the plasma. Here we illustrate their importance using two framewor... | 2012-01-01 | |
| 11 |  | Simple renormalizable flavor symmetry for neutrino oscillations | Gondolo, Paolo | The recent measurement of a nonzero neutrino mixing angle θ13 requires a modification of the tri-bimaximal mixing pattern that predicts a zero value for it. We propose a new neutrino mixing pattern based on a spontaneously broken A4 flavor symmetry and a type-I seesaw mechanism. Our model allows fo... | 2012-01-01 | |
| 12 |  | Asymptotic and intermediate long-time behavior of nuclear free induction decays in polycrystalline solids and powders | Saam, Brian | Free induction decay (FID) measured by nuclear magnetic resonance (NMR) in a polycrystalline solid is the isotropic average of the FIDs for individual single crystallites. It has been recently proposed theoretically and verified experimentally that the long-time behavior of single-crystal FIDs has t... | 2012-01-01 | |
| 13 |  | Superconductor-insulator transition in long MoGe nanowires | Rogachev, Andrey | 2012-01-01 | ||
| 14 |  | Spin and charge structure of the surface states in topological insulators | Mishchenko, Eugene | We investigate the spin and charge densities of surface states of the three-dimensional topological insulator Bi2Se3, starting from the continuum description of the material [Zhang et al., Nat. Phys. 5, 438 (2009)]. The spin structure on surfaces other than the (111) surface has additional complexit... | 2012-01-01 | |
| 15 |  | Ground-state degeneracy in the Levin-Wen model for topological phases | Wu, Yong-Shi | We study the properties of topological phases by calculating the ground-state degeneracy (GSD) of the two-dimensional Levin-Wen (LW) model. Here it is explicitly shown that the GSD depends only on the spatial topology of the system. Then we show that the ground state on a sphere is always nondegener... | 2012-01-01 | |
| 16 |  | Effect of magnetic Gd impurities on the superconducting state of amorphous Mo-Ge thin films with different thickness and morphology | Gerton, Jordan | We studied the effect of magnetic doping with Gd atoms on the superconducting properties of amorphous Mo70Ge30 films. We observed that in uniform films deposited on amorphous Ge, the pair-breaking strength per impurity strongly decreases with film thickness initially and saturates at a finite value ... | 2012-01-01 | |
| 17 |  | Exciton storage in CdSe/CdS tetrapod semiconductor nanocrystals: electric field effects on exciton and multiexciton states | Lupton, John Mark | CdSe/CdS nanocrystal tetrapods are interesting building blocks for excitonic circuits, where the flow of excitation energy is gated by an external stimulus. The physical morphology of the nanoparticle, along with the electronic structure, which favors electron delocalization between the two semicond... | 2012-01-01 | |
| 18 |  | Slow hopping and spin dephasing of coulombically bound polaron pairs in an organic semiconductor at room temperature | Lupton, John Mark | Polaron pairs are intermediate electronic states that are integral to the optoelectronic conversion process in organic semiconductors. Here, we report on electrically detected spin echoes arising from direct quantum control of polaron pair spins in an organic light-emitting diode at room temperature... | 2012-01-01 | |
| 19 |  | Axion cold dark matter in nonstandard cosmologies | Gondolo, Paolo | We study the parameter space of cold dark matter axions in two cosmological scenarios with nonstandard thermal histories before big bang nucleosynthesis: the low-temperature reheating (LTR) cosmology and the kination cosmology. If the Peccei-Quinn symmetry breaks during inflation, we find more allow... | 2010-01-01 | |
| 20 |  | Comment on pressure dependence of wall relaxation in polarized 3He gaseous cells | Saam, Brian | Zheng et al. [Zheng, Gao, Ye, and Zhang, Phys. Rev. A 83, 061401(R) (2011)] have measured a strong linear pressure dependence of the nuclear relaxation rate of 3He in glass cells typically used to generate and/or store polarized 3He at room and cryogenic temperatures. Their interpretation is that th... | 2012-01-01 | |
| 21 |  | Phase relationship between the long-time beats of free induction decays and spin echoes in solids | Saam, Brian | Recent theoretical work on the role of microscopic chaos in the dynamics and relaxation of many-body quantum systems has made several experimentally confirmed predictions about the systems of interacting nuclear spins in solids, focusing in particular on the shapes of spin echo responses measured by... | 2012-01-01 | |
| 22 |  | Light dark matter in leptophobic Z' models | Gondolo, Paolo | Recent experimental results in direct dark matter detection may be interpreted in terms of a dark matter particle of mass around 10 GeV=c2. We show that the required scenario can be realized with a new dark matter particle charged under an extra Abelian gauge boson Z0 that couples to quarks but not ... | 2012-01-01 | |
| 23 |  | Semileptonic decays of D mesons in three-flavor lattice QCD | DeTar, Carleton | We present the first three-flavor lattice QCD calculations for D→ rrlv and D→ Klv semileptonic decays. Simulations are carried out using ensembles of unquenched gauge fields generated by the MILC Collaboration. With an improved staggered action for light quarks, we are able to simulate at light ... | Semileptonic decay; Staggered quarks | 2005-01 |
| 24 |  | Shear force microscopy with capacitance detection for near-field scanning optical microscopy | Williams, Clayton C. | Shear force microscopy is very useful for distance regulation in near-field scanning optical microscopy (NSOM). However, the optical method used to detect the shear force can cause problems when imaging photosensitive materials, i.e., the shear force detection beam can optically pump the sample. We ... | Shear force microscopy; Atom force microscope; AFM; Capacitance sensing | 1995 |
| 25 |  | Short-range versus long-range order in a model binary alloy | Mattis, Daniel C. | We calculate the free energy of a linear binary metallic alloy using an exact transfer-matrix formalism. We obtain for the first time the electronic band structure when there is nonvanishing short-range order and calculate the temperature dependence of the short-range order parameter. Following Foo... | Binary alloys; Density of state; Free energy | 1971-07 |