Zobrazeno 1 - 10
of 24
pro vyhledávání: '"S Mossmann"'
Publikováno v:
New Journal of Physics, Vol 26, Iss 1, p 019501 (2024)
Externí odkaz:
https://doaj.org/article/f6c0ed7d2ba743f2955f94a4796b53f9
Publikováno v:
Journal of Physics A: Mathematical and General. 38:3381-3395
A Lie-algebraic approach successfully used to describe one-dimensional Bloch oscillations in a tight-binding approximation is extended to two dimensions. This extension has the same algebraic structure as the one-dimensional case while the dynamics s
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a312a0db0e2b925e2e8d451e45bd8efb
https://doi.org/10.1088/0305-4470/38/15/010
https://doi.org/10.1088/0305-4470/38/15/010
Publikováno v:
Journal of Physics A: Mathematical and General. 38:1777-1792
The stationary nonlinear Schroedinger equation, or Gross-Pitaevskii equation, is studied for the cases of a single delta potential and a delta-shell potential. These model systems allow analytical solutions, and thus provide useful insight into the f
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e7930d424c37b8f5edbb894c0c7c0680
https://doi.org/10.1088/0305-4470/38/8/013
https://doi.org/10.1088/0305-4470/38/8/013
Autor:
S. Mossmann, Hans Jürgen Korsch
Publikováno v:
Physics Letters A. 317:54-63
The dynamics of the driven tight binding model for Wannier-Stark systems is formulated and solved using a dynamical algebra. This Lie algebraic approach is very convenient for evaluating matrix elements and expectation values. It is also shown that a
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::aca66fbebaec27b532c4746999f301d2
https://doi.org/10.1016/j.physleta.2003.08.038
https://doi.org/10.1016/j.physleta.2003.08.038
Autor:
S Mossmann, Hans Jürgen Korsch
Publikováno v:
Journal of Physics A: Mathematical and General. 36:2139-2153
The complex energy resonances of a double δ potential well in a constant (Stark) field are studied. Varying the two system parameters (well distance and field strength) we investigate the behaviour of the resonance energies and wavefunctions both an
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::373ff7364cdc6bbbddad7b22b7665af4
https://doi.org/10.1088/0305-4470/36/8/311
https://doi.org/10.1088/0305-4470/36/8/311
Publikováno v:
Journal of Physics A: Mathematical and General. 36:2125-2137
The typical avoided crossings for Hermitian quantum systems depending on parameters, the diabolic crossing scenario, are generalized to the non-Hermitian case, e.g. for resonances. Two types of crossings appear: for type I, the real parts show an avo
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::40c0199dbac430aef59d9ecac329c071
https://doi.org/10.1088/0305-4470/36/8/310
https://doi.org/10.1088/0305-4470/36/8/310
Autor:
S. Mossmann, C. Jung
Publikováno v:
Physical Review A. 74
We present a new approach for the analysis of Bose-Einstein condensates in a few mode approximation. This method has already been used to successfully analyze the vibrational modes in various molecular systems and offers a new perspective on the dyna
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9a1e5660691698577288c1fc2a5abd2c
https://doi.org/10.1103/physreva.74.033601
https://doi.org/10.1103/physreva.74.033601
Quantum decay in an ac driven biased periodic potential modeling cold atoms in optical lattices is studied for a symmetry broken driving. For the case of fully chaotic classical dynamics the classical exponential decay is quantum mechanically suppres
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c806a6639e5216859a2922613ca11987
http://arxiv.org/abs/quant-ph/0506090
http://arxiv.org/abs/quant-ph/0506090
Publikováno v:
Physical Review E. 71
We investigate the dynamics of Bose-Einstein condensates (BEC) in a tilted one-dimensional periodic lattice within the mean-field (Gross-Pitaevskii) description. Unlike in the linear case the Bloch oscillations decay because of nonlinear dephasing. P
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::52009b80c47080b9448c853dd5dc2af3
https://doi.org/10.1103/physreve.71.036625
https://doi.org/10.1103/physreve.71.036625
Publikováno v:
New Journal of Physics. 6:41-41
Bloch oscillations in a two-dimensional periodic potential under a (relatively weak) static force are studied for separable and non-separable potentials. The dynamics depends sensitively on the direction of the static field with respect to the lattic
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::9c5291e8a2b93a0277c2d91374133ad0
https://doi.org/10.1088/1367-2630/6/1/041
https://doi.org/10.1088/1367-2630/6/1/041