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Creator | Title | Description | Subject | Date |
| 1 |
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Mattis, Daniel C. | A contribution to the many-fermion problem | In this work we reexamine the many-fermion problem in arbitrary dimensions. It is shown that in two dimensions or higher, the Hamiltonian of interacting fermions can be separated into individual nonintersecting sectors labeled by the wave-vector q. Within each sector the Hamiltonian maps onto a gene... | | 2012-01-01 |
| 2 |
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Gondolo, Paolo | Aberration features in directional dark matter detection | The motion of the Earth around the Sun causes an annual change in the mag-nitude and direction of the arrival velocity of dark matter particles on Earth, in a way analogous to aberration of stellar light. In directional detectors, aberration of weakly interacting massive particles (WIMPs) modulates ... | | 2012-01-01 |
| 3 |
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Rogachev, Andrey | Admittance spectroscopy study of polymer diodes in small magnetic fields | We performed a systematic study of bipolar and unipolar organic diodes based on the p-conjugated polymer, 2-methoxy-5-(20-ethylhexyloxy) (MEH-PPV), using electronic and magneto-transport measurements with magnetic field in the range 0-180mT and admittance spectroscopy in the frequency range 1 Hz<f<1... | | 2012-01-01 |
| 4 |
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Mattis, Daniel C. | An expanded Luttinger model | This paper generalizes Luttinger's model by introducing curvature (d2ε (k) dk2 ≠ 0 ) into the kinetic energy. An exact solution for arbitrary interactions is still possible in principle, but it now requires disentangling the eigenvalue spectrum of an harmonic string of interacting boson fields at... | | 2012-01-01 |
| 5 |
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Saam, Brian | Asymptotic and intermediate long-time behavior of nuclear free induction decays in polycrystalline solids and powders | 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 |
| 6 |
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Bromley, Benjamin C. | Binary disruption by massive black holes: hypervelocity stars, S stars, and tidal disruption events | We examine whether disrupted binary stars can fuel black hole growth. In this mechanism, tidal disruption produces a single hypervelocity star (HVS) ejected at high velocity and a former companion star bound to the black hole. After a cluster of bound stars forms, orbital diffusion allows the black ... | | 2012-01-01 |
| 7 |
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Saam, Brian | Comment on pressure dependence of wall relaxation in polarized 3He gaseous cells | 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 |
| 8 |
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Gerton, Jordan | Effect of magnetic Gd impurities on the superconducting state of amorphous Mo-Ge thin films with different thickness and morphology | 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 |
| 9 |
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Gondolo, Paolo | The effect of quark interactions on dark matter kinetic decoupling and the mass of the smallest dark halos | 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 |
| 10 |
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Lupton, John Mark | Exciton storage in CdSe/CdS tetrapod semiconductor nanocrystals: electric field effects on exciton and multiexciton states | 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 |
| 11 |
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Wu, Yong-Shi | Ground-state degeneracy in the Levin-Wen model for topological phases | 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 |
| 12 |
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Gondolo, Paolo | Halo independent comparison of direct dark matter detection data | We extend the halo-independent method of Fox, Liu, and Weiner to include energy resolution and efficiency with arbitrary energy dependence, making it more suitable for experiments to use in pre-senting their results. Then we compare measurements and upper limits on the direct detection of low mass (... | | 2012-01-01 |
| 13 |
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Gondolo, Paolo | Light dark matter in leptophobic Z' models | 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 |
| 14 |
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Rogachev, Andrey | Magnetic-field dependent differential capacitance of polymer diodes | Using admittance spectroscopy, we found that bipolar organic diodes based on pi-conjugated polymer, 2-methoxy-5-(20-ethylhexyloxy), MEH-PPV, have strong divergent contribution to the device differential capacitance. It is positive at low bias voltages, turns negative at intermediate biases, and beco... | | 2012-01-01 |
| 15 |
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Vardeny, Zeev Valentine | Mechanically stretchable and reversibly deformable liquid metal-based plasmonics | We demonstrate that liquid metals are attractive materials for active plasmonic devices at terahertz frequencies. Using a liquid metal injected into an elastomeric mold, we measure the static and stretched transmission properties of aperture arrays. | | 2012-01-01 |
| 16 |
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Boehme, Christoph | Modulation frequency dependence of continuous-wave optically/electrically detected magnetic resonance | 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 |
| 17 |
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Saam, Brian | Phase relationship between the long-time beats of free induction decays and spin echoes in solids | 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 |
| 18 |
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Vardeny, Zeev Valentine | Photoexcitation dynamics in polythiophene/fullerene blends for photovoltaic applications | We used the transient and steady state photomodulation spectroscopies for studying the photoexcitations dynamics in blends of regio-regular poly(3-hexylthiophene) (RR-P3HT) and fullerene in a broad spectral range from 0.15 to 2.25 eV. We found that both localized polarons and singlet excitons are in... | | 2012-01-01 |
| 19 |
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Mattis, Daniel C. | Preface | It was the early 1960s. Elliott H. Lieb and the present author were colleagues at the IBM Research Laboratories in Yorktown Heights, occupying neighboring cubicles. We collaborated in the study, creation and solution of mathematical models of many-body phenomena. In the course of this work we ultima... | | 2012-01-01 |
| 20 |
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Lupton, John Mark | Probing the electrode-polymer interface in conjugated polymer devices with surface-enhanced Raman scattering | A crucial consideration in organic devices is the role of the interface between a metal electrode and the active polymer material. Here, we use the conjugated polymer poly[2-methoxy-5-(2-ethylhexyl-oxy)-1,4-phenylene-vinylene] (MEH-PPV) with model gold and silver electrodes to perform surface-enhanc... | | 2012-01-01 |
| 21 |
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Mishchenko, Eugene | Resonant finite-size impurities in graphene, unitary limit, and Friedel oscillations | 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 |
| 22 |
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Gondolo, Paolo | Ring-like features in directional dark matter detection | We discuss a novel dark matter signature relevant for directional detection of Weakly Interacting Massive Particles (WIMPs). For heavy enough WIMPs and low enough recoil energies, the maximum of the recoil rate is not in the direction of the average WIMP arrival direction but in a ring around it at ... | | 2012-01-01 |
| 23 |
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Gondolo, Paolo | Simple renormalizable flavor symmetry for neutrino oscillations | 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 |
| 24 |
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Lupton, John Mark | Slow hopping and spin dephasing of coulombically bound polaron pairs in an organic semiconductor at room temperature | 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 |
| 25 |
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Vardeny, Zeev Valentine | Spectral analysis of near threshold random lasers | Emission spectra from random lasing systems typically have numerous narrow resonant lines. When excited very near to the laser threshold there are fewer resonant lines which clarify the emission spectrum analysis. We studied three different random lasing systems including ?-conjugated polymer films... | | 2012 |
