Zobrazeno 1 - 10
of 41
pro vyhledávání: '"K. W. Kehr"'
Publikováno v:
Annalen der Physik. 7:732-736
The tunneling of Gaussian wave packets has been investigated by numerically solving the one-dimensional Schr\"odinger equation. The shape of wave packets interacting with a square barrier has been monitored for various values of the barrier width, he
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https://explore.openaire.eu/search/publication?articleId=doi_dedup___::32954fdfe18e719e0ae4ae29a6d2add5
https://doi.org/10.1002/(sici)1521-3889(199812)7:7/8<732::aid-andp732>3.0.co
https://doi.org/10.1002/(sici)1521-3889(199812)7:7/8<732::aid-andp732>3.0.co
Autor:
K. W. Kehr
Publikováno v:
Czechoslovak Journal of Physics. 48:449-456
First-passage time distributions (FPTD) of the arrival of a walk at a terminal site of a finite linear chain are considered, where the individual transition processes between the sites are specified by rather general waiting-time distributions. An ex
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https://explore.openaire.eu/search/publication?articleId=doi_________::e70c2a32178ce4969c079f65f8ceb014
https://doi.org/10.1023/a:1021245909701
https://doi.org/10.1023/a:1021245909701
Publikováno v:
Physical Review A. 53:3749-3755
The Larmor clock which was proposed to determine tunneling times of particles with spin through barriers is studied. Tunneling of wave packets is numerically derived from the time-dependent Schr\"odinger-Pauli equation. The Larmor clock often does no
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https://explore.openaire.eu/search/publication?articleId=doi_dedup___::53b3247d9b84af844cfb4b0ad72eb6bb
https://doi.org/10.1103/physreva.53.3749
https://doi.org/10.1103/physreva.53.3749
Autor:
K W Kehr, T Wichmann
Publikováno v:
Journal of Physics: Condensed Matter. 7:717-730
Collective diffusion of lattice gases of arbitrary concentrations is investigated in lattices of dimensions d>or=2 with randomly distributed site energies. The Gaussian, exponential and dichotomic distributions of site energies are employed. An effec
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https://doi.org/10.1088/0953-8984/7/4/003
https://doi.org/10.1088/0953-8984/7/4/003
Publikováno v:
Journal of Physics A: Mathematical and General. 27:L263-L268
Collective diffusion of particles is studied in a three-dimensional lattice-gas model with site-energy disorder. The distribution of the site energies is exponential, and the diffusion coefficient of independent particles may vanish. It is demonstrat
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https://explore.openaire.eu/search/publication?articleId=doi_________::3253b892c0ca67ca0b0a525ce8fd128f
https://doi.org/10.1088/0305-4470/27/9/005
https://doi.org/10.1088/0305-4470/27/9/005
Autor:
Moritz Braun, K. W. Kehr
Publikováno v:
Solid State Ionics. :167-170
Lattice gases on simple-cubic lattices with randomly blocked sites are studied by numerical simulations. The behaviour of the single-particle diffusion coefficient is well described by a linear relation for small and moderate defect concentrations. I
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https://doi.org/10.1016/0167-2738(90)90313-g
https://doi.org/10.1016/0167-2738(90)90313-g
Autor:
J. W. Haus, K. W. Kehr
Publikováno v:
Stochastic Processes in Nonequilibrium Systems ISBN: 354008942X
In this seminar the results of a generalization of the continuoustime random walk (CTRW) theory of Montroll and Weiss to include correlations over two jumps are reported. A simple one-dimensional example is discussed and a homogeneous second, order d
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https://explore.openaire.eu/search/publication?articleId=doi_________::46bdee0efb182e1d1aa6266328bd5aee
https://doi.org/10.1007/bfb0016735
https://doi.org/10.1007/bfb0016735
Autor:
K. W. Kehr, Zbigniew Koza
Publikováno v:
Scopus-Elsevier
The hopping motion of lattice gases through potentials without mirror-reflection symmetry is investigated under various bias conditions. The model of 2 particles on a ring with 4 sites is solved explicitly; the resulting current in a sawtooth potenti
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http://arxiv.org/abs/cond-mat/9909154
http://arxiv.org/abs/cond-mat/9909154
Autor:
K. W. Kehr, K. P. N. Murthy
Publikováno v:
Physical Review A. 41:5728-5730
The distribution of mean first-passage times (MFPT's) in ensembles of disordered lattice segments is characterized for the first time. The median of the distribution corresponds to the predicted typical behavior of the MFPT. The distribution exhibits
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https://doi.org/10.1103/physreva.41.5728
https://doi.org/10.1103/physreva.41.5728
Autor:
K. W. Kehr, T. Wichmann
A survey is given on asymptotic diffusion coefficients of particles in lattices with random transition rates. Exact and approximate results for single particles are reviewed. A recent exact expression in $d = 1$ which includes occupation factors is d
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http://arxiv.org/abs/cond-mat/9602121
http://arxiv.org/abs/cond-mat/9602121