Zobrazeno 1 - 10
of 753
pro vyhledávání: '"Graf G"'
Autor:
Graf, G. M., Porta, M.
Topological insulators can be characterized alternatively in terms of bulk or edge properties. We prove the equivalence between the two descriptions for two-dimensional solids in the single-particle picture. We give a new formulation of the $\mathbb{
Externí odkaz:
http://arxiv.org/abs/1207.5989
Publikováno v:
Journal of Statistical Physics, 148(5):800-823, 2012
We study the adiabatic response of open systems governed by Lindblad evolutions. In such systems, there is an ambiguity in the assignment of observables to fluxes (rates) such as velocities and currents. For the appropriate notion of flux, the formul
Externí odkaz:
http://arxiv.org/abs/1202.5750
We develop an adiabatic theory for generators of contracting evolution on Banach spaces. This provides a uniform framework for a host of adiabatic theorems ranging from unitary quantum evolutions through quantum evolutions of open systems generated b
Externí odkaz:
http://arxiv.org/abs/1106.4661
Publikováno v:
New J. Phys. 13 053042
We develop a theory of adiabatic response for open systems governed by Lindblad evolutions. The theory determines the dependence of the response coefficients on the dephasing rates and allows for residual dissipation even when the ground state is pro
Externí odkaz:
http://arxiv.org/abs/1008.4079
The parametrization of adiabatic paths is optimal when tunneling is minimized. Hamiltonian evolutions do not have unique optimizers. However, dephasing Lindblad evolutions do. The optimizers are simply characterized by an Euler-Lagrange equation and
Externí odkaz:
http://arxiv.org/abs/1003.2172
We derive an analog of the Landau-Zener adiabatic tunneling formula for an open, two-level system coupled to a memoryless, dephasing bath. The derivation rests on a geometric view of the spectral subspaces as adiabatic invariants.
Comment: 9 pag
Comment: 9 pag
Externí odkaz:
http://arxiv.org/abs/0912.4640
The basic quantum mechanical relation between fluctuations of transported charge and current correlators is discussed. It is found that, as a rule, the correlators are to be time-ordered in an unusual way. Instances where the difference with the conv
Externí odkaz:
http://arxiv.org/abs/0907.3848
The Schroedinger equation with a potential periodically varying in time is used to model adiabatic quantum pumps. The systems considered may be either infinitely extended and gapped or finite and connected to gapless leads. Correspondingly, two descr
Externí odkaz:
http://arxiv.org/abs/0902.4638
Autor:
Bachmann, S., Graf, G. M.
We review some known facts in the transport theory of mesoscopic systems, including counting statistics, and discuss its relation with the mathematical treatment of open systems.
Comment: Plenary talk given by G.M.G. at QMath10, Moeciu, Romania,
Comment: Plenary talk given by G.M.G. at QMath10, Moeciu, Romania,
Externí odkaz:
http://arxiv.org/abs/0808.0560
Publikováno v:
Phys. Rev. B 78, 165330 (2008)
We make use of the first-quantized wave-packet formulation of the full counting statistics to describe charge transport of noninteracting electrons in a mesoscopic device. We derive various expressions for the characteristic function generating the f
Externí odkaz:
http://arxiv.org/abs/0802.0143