搜索结果: 31-45 共查到“理学 tunneling”相关记录92条 . 查询时间(0.095 秒)
Observation of novel interference patterns in Bi2-xFexTe3+d by Fourier transform scanning tunneling spectroscopy
novel interference patterns tunneling spectroscopy
2010/11/25
In topological insulators (TI), strong spin-orbit coupling results in non-trivial scattering
processes of the surface states, whose effects include suppressed back scattering1, 2, 3, 4 weak anti-loca...
We study the tunneling through delta and double delta potentials in fractional quantum mechanics. After solving the fractional Schr\"odinger equation for these potentials, we calculate the correspondi...
Scaling and non-Abelian signature in fractional quantum Hall quasiparticle tunneling amplitude
fractional quantum Hall quasiparticle amplitude
2010/11/25
We study the scaling behavior in the tunneling amplitude when quasiparticles
tunnel along a straight path between the two edges of a fractional quantum Hall
annulus. Such scaling behavior originates...
We investigate flux vacua on a variety of one-parameter Calabi-Yau compactifications,and find many examples that are connected through continuous monodromy transformations.
A classical particle that is initially in a classically allowed region of a potential is not confined to this region for all time if its energy is complex. Rather, the particle may travel through com...
Coupling molecular spin states by photon-assisted tunneling
Coupling molecular spin states photon-assisted tunneling
2010/11/9
Artificial molecules containing just one or two electrons provide a powerful platform for studies of orbital and spin quantum dynamics in nanoscale devices. A well-known example of these dynamics is t...
Macroscopic quantum tunneling in multigap superconducting Josephson junctions: Escape rate enhancement via quantum fluctuations of Josephson-Leggett mode
Macroscopic quantum superconducting Josephson Escape rate enhancement Josephson-Leggett mode
2010/11/5
We theoretically study the macroscopic quantum tunneling (MQT) in a hetero Josephson junction formed by a conventional single-gap superconductor and a multi-gap one such as ${MgB}_{2}$ and iron-based...
Ultrafast control of inelastic tunneling in a double semiconductor quantum
Ultrafast control inelastic tunneling double semiconductor quantum
2010/11/11
In a semiconductor-based double quantum well (QW) coupled to a degree of freedom with an internal dynamics, we demonstrate that the electronic motion is controllable within femtoseconds by applying ap...
Several ways are discussed how to control the Landau–Zener tunneling in the Wannier–Stark system. We focus on a realization of this system with interacting and noninteracting ultracold bosons. The tun...
Klein tunneling in carbon nanostructures: a free particle dynamics in disguise
Klein tunneling carbon nanostructures particle dynamics disguise
2010/11/9
The absence of backscattering in metallic nanotubes as well as perfect Klein tunneling in the potential barriers in graphene are explained by showing that both phenomena have a free particle dynamics...
Nonlinear Landau-Zener tunneling in quantum phase space
Nonlinear tunneling quantum phase space
2010/10/29
We present a detailed analysis of the Landau-Zener problem for an interacting Bose-Einstein condensate in a time-varying double-well trap, especially focussing on the relation between the full many-p...
Direct regular-to-chaotic tunneling rates using the fictitious integrable system approach
Direct regular-to-chaotic tunneling rates fictitious integrable system approach
2010/10/21
We review the fictitious integrable system approach which predicts dynamical tunneling rates
from regular states to the chaotic region in systems with a mixed phase space. It is based on the introduc...
Tunneling under Coherent Control by Sequences of Unitary Pulses
Tunneling Coherent Control by Sequences Unitary Pulses
2010/10/19
A general coherent control scenario to suppress, or accelerate, tunneling of quantum states decaying into a continuum, is investigated. The method is based on deterministic, or stochastic, sequences o...
Efficient creation of maximally entangled states by modulation of tunneling rates
entangled states modulation of tunneling rates
2010/4/16
For systems described by the two-site Bose-Hubbard Hamiltonian, we show that a sinusoidal modulation of the tunneling matrix element assists higher-order co-tunneling processes. Using this mechanism, ...
Chaotic instantons and enhancement of tunneling in kicked double-well system with time-reversal symmetry
time-reversal symmetry Chaotic instantons dynamical tunneling
2010/4/2
Chaotic instanton approach is used to describe dynamical tunneling in kicked double well system. Effective Hamiltonian for the kicked system is obtained using matrix expansion formula for operator exp...