Results 21 to 30 of about 1,094 (53)
, 2011 We consider a cloud of fermionic atoms in an optical lattice described by a Hubbard model with an additional linear potential. While homogeneous interacting systems mainly show damped Bloch oscillations and heating, a finite cloud behaves differently: It
Mandt, Stephan, Rapp, Akos, Rosch, Achim
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Theoretical analysis of spectral gain in a THz quantum cascade laser: prospects for gain at 1 THz
, 2003 In a recent Letter [Appl. Phys. Lett. 82, 1015 (2003)], Williams et al. reported the development of a terahertz quantum cascade laser operating at 3.4 THz or 14.2 meV.
Lee, S. -C., Wacker, A.
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Random-phase reservoir and a quantum resistor: The Lloyd model [PDF]
, 2007 We introduce phase disorder in a 1D quantum resistor through the formal device of `fake channels' distributed uniformly over its length such that the out-coupled wave amplitude is re-injected back into the system, but with a phase which is random.
Dibyendu Roy +5 more
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On the concept of effective temperature in current carrying quantum critical states
, 2009 Quantum criticality has attracted considerable attention both theoretically and experimentally as a way to describe part of the phase diagram of strongly correlated systems.
Choi +14 more
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, 2008 Through an exact analysis using quantum Langevin dynamics, we demonstrate the crossover from ballistic to diffusive thermal transport in a harmonic chain with each site connected to Ohmic heat reservoirs.
Dibyendu Roy, F. Bonetto
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Conductance Fluctuations of Generic Billiards: Fractal or Isolated? [PDF]
, 2000 We study the signatures of a classical mixed phase space for open quantum systems. We find the scaling of the break time up to which quantum mechanics mimics the classical staying probability and derive the distribution of resonance widths.
Brady J. W. +9 more
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Coherent tunneling by adiabatic passage in an optical waveguide system
, 2007 We report on the first experimental demonstration of light transfer in an engineered triple-well optical waveguide structure which provides a classic analogue of Coherent Tunnelling by Adiabatic Passage (CTAP) recently proposed for coherent transport in ...
D. Dragoman +8 more
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Coherent ratchets in driven Bose-Einstein condensates [PDF]
, 2009 We study the response of a Bose-Einstein condensate to an unbiased periodic driving potential. By controlling the space and time symmetries of the driving we show how a directed current can be induced, producing a coherent quantum ratchet.
Creffield, C. E., Sols, F.
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Anderson Localization in Disordered Vibrating Rods
, 2012 We study, both experimentally and numerically, the Anderson localization phenomenon in torsional waves of a disordered elastic rod, which consists of a cylinder with randomly spaced notches.
Flores, J. +5 more
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Dephasing via stochastic absorption: A case study in Aharonov-Bohm oscillations [PDF]
, 2002 The Aharonov-Bohm ring has been the mainstay of mesoscopic physics research since its inception. In this paper we have dwelt on the problem of dephasing of AB oscillations using a phenomenological model based on stochastic absorption.
A. M. Jayannavar +15 more
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