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- Frank Groflmann, Peter Jung, Thomas Dittrich, Peter H~inggi
- 1991

The influence of periodic driving on coherent tunneling is investigated, using a quartic double-well potential in a monochromatic external field as a working example. Extensive numerical studies of the long-time behaviour of this system are combined with an analytical description on basis of the quasienergy formalism. Approximate solutions of the dynamics… (More)

- Sigmund Kohler, Thomas Dittrich, Peter Hä
- 1996

Using the parametrically driven harmonic oscillator as a working example, we study two different Markov-ian approaches to the quantum dynamics of a periodically driven system with dissipation. In the simpler approach, the driving enters the master equation for the reduced density operator only in the Hamiltonian term. An improved master equation is achieved… (More)

- Thomas Dittrich, Chen Menachem, Herzel Yamin, Lou Adams, Tadiran Batteries
- 2011

Non-rechargeable batteries with a life of 20 years and more are required today for many smart metering and AMR applications in the US. Tadiran's non-rechargeable lithium thionyl chloride batteries offer a proven life of 25 years. Kohler's new touchless commercial faucet was designed to run even 30 years on a hybrid lithium battery. Similar requirements… (More)

Chaotic tunneling in a driven double-well system is investigated in absence as well as in the presence of dissipation. As the constitutive mechanism of chaos-assisted tunneling, we focus on the dynamics in the vicinity of three-level crossings in the quasienergy spectrum. They are formed when a tunnel doublet, located on a pair of symmetry-related tori in… (More)

- Arturo Argüelles, Thomas Dittrich
- 2005

We construct, using simple geometrical arguments, a Wigner function defined on a discrete phase space of arbitrary integer Hilbert-space dimension that is free of redundancies. " Ghost images " plaguing other Wigner functions for discrete phase spaces are thus revealed as artifacts. It allows to devise a corresponding phase-space propagator in an… (More)

- Frank Grossmann, Thomas Dittrich, Peter Jung, Peter H~inggil
- 1993

The quantum dynamics of a quartic double well, subjected to a harmonically oscillating field, is studied in the framework of the Floquet formalism. The modifications of the familiar tunneling process due to the driving are investigated numerically and explained in terms of the structure of the corresponding local quasienergy spectrum. In particular, there… (More)

- Juan A Anta, Iván Mora-Seró, Thomas Dittrich, Juan Bisquert
- Physical chemistry chemical physics : PCCP
- 2008

We make use of the numerical simulation random walk (RWNS) method to compute the "jump" diffusion coefficient of electrons in nanostructured materials via mean-square displacement. First, a summary of analytical results is given that relates the diffusion coefficient obtained from RWNS to those in the multiple-trapping (MT) and hopping models. Simulations… (More)

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