Closed system approach to open systems: Tunneling decay of interacting cold bosons in an optical lattice

Autor:	Rapedius, K.
Rok vydání:	2012
Předmět:	Condensed Matter - Quantum Gases Quantum Physics
Zdroj:	J. Phys. B: At. Mol. Opt. Phys. 46 (2013) 125301
Druh dokumentu:	Working Paper
DOI:	10.1088/0953-4075/46/12/125301
Popis:	A Bose-Hubbard Hamiltonian, modeling cold bosons in an optical lattice, is used to simulate the dynamics of interacting open quantum systems as subsystems a larger closed system, avoiding complications like the introduction of baths, complex absorbing potentials or absorbing boundaries. The numerically exact unitary dynamics is compared with effective descriptions of the subsystems based on non-Hermitian Hamiltonians or Lindblad master equations. The validity of popular models with constant decay rates is explicitly analyzed for decaying single and double wells. In addition we present a discrete lattice version of the Siegert approximation method for calculating decay rates. Comment: 11 pages, 5 figures
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/1212.5379 Zobrazit plný text záznamu View this record from Arxiv