Results 31 to 40 of about 1,094 (53)
Wave packet approach to periodically driven scattering
, 2004 For autonomous systems it is well known how to extract tunneling probabilities from wavepacket calculations. Here we present a corresponding approach for periodically time-dependent Hamiltonians, valid at all frequencies, field strengths, and transition ...
A. J. Lichtenberg +2 more
core +1 more source
Transport properties of nano-devices: One-dimensional model study
, 2005 A 1D model study of charge transport in nano-devices is made by comparing multi-configuration time dependent Hartree-Fock and frozen core calculations. The influence of exchange and Coulomb correlation on the tunneling current is determined.
C. F. Destefani +4 more
core +1 more source
Density dynamics from current auto-correlations at finite time- and length-scales [PDF]
, 2009 We consider the increase of the spatial variance of some inhomogeneous, non-equilibrium density (particles, energy, etc.) in a periodic quantum system of condensed matter-type. This is done for a certain class of initial quantum states which is supported
Benz J. +10 more
core +1 more source
Diffusion on a heptagonal lattice
, 2008 We study the diffusion phenomena on the negatively curved surface made up of congruent heptagons. Unlike the usual two-dimensional plane, this structure makes the boundary increase exponentially with the distance from the center, and hence the ...
Beom Jun Kim +11 more
core +1 more source
Avoiding dark states in open quantum systems by tailored initial correlations
, 2012 We study the transport of excitations on a V-shaped network of three coupled two-level systems that are subjected to an environment that induces incoherent hopping between the nodes.
H. Breuer +3 more
core +1 more source
Photon-Number Squeezing in Circuit Quantum Electrodynamics [PDF]
, 2008 A superconducting single-electron transistor (SSET) coupled to an anharmonic oscillator, e.g., a Josephson junction-L-C circuit, can drive the latter to a nonequilibrium photon number state. By biasing the SSET in a regime where the current is carried by
Alexander Shnirman +3 more
core +3 more sources
Molecular Wires Acting as Coherent Quantum Ratchets
, 2002 The effect of laser fields on the electron transport through a molecular wire being weakly coupled to two leads is investigated. The molecular wire acts as a coherent quantum ratchet if the molecule is composed of periodically arranged, asymmetric ...
A. Aviram +26 more
core +1 more source
Avoided level crossing statistics in open chaotic billiards
, 2009 We investigate a two-level model with a large number of open decay channels in order to describe avoided level crossing statistics in open chaotic billiards.
Dietz, Barbara +4 more
core +3 more sources
Quantum Shuttle in Phase Space [PDF]
, 2003 We present a quantum theory of the shuttle instability in electronic transport through a nanostructure with a mechanical degree of freedom. A phase space formulation in terms of the Wigner function allows us to identify a cross-over from the tunnelling ...
Donarini, Andrea +2 more
core +3 more sources
Transient behavior of full counting statistics in thermal transport
, 2011 The generating function of energy counting statistics is derived for phononic junction systems. It is expressed in terms of the contour-ordered self-energy of the lead with shifted arguments, $\Sigma^A(\tau, \tau') = \Sigma_L\bigl(\tau +\hbar x(\tau ...
Agarwalla, Bijay Kumar +2 more
core +1 more source