Transport of strong-coupling polarons in optical lattices
Transport of strong-coupling polarons in optical lattices
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光学晶格中强耦合极化子的传输
DOI:
10.1088/1367-2630/10/3/033015
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发表时间:
2008
影响因子:
3.3
通讯作者:
Bruderer M
中科院分区:
文献类型:
--
作者:
Bruderer M
We study the transport of ultracold impurity atoms immersed in a Bose–Einstein condensate (BEC) and trapped in a tight optical lattice. Within the strong-coupling regime, we derive an extended Hubbard model describing the dynamics of the impurities in terms of polarons, ie impurities dressed by a coherent state of Bogoliubov phonons. Using a generalized master equation based on this microscopic model, we show that inelastic and dissipative phonon scattering results in (i) a crossover from coherent to incoherent transport of impurities with increasing BEC temperature and (ii) the emergence of a net atomic current across a tilted optical lattice. The dependence of the atomic current on the lattice tilt changes from ohmic conductance to negative differential conductance within an experimentally accessible parameter regime. This transition is accurately described by an Esaki–Tsu-type relation with the effective relaxation time of the impurities as a temperature-dependent parameter.
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影响因子:
3
作者:
E. Gross
通讯作者:
E. Gross
DOI:
10.1103/physrevb.49.12938
发表时间:
1994-02
期刊:
Physical review. B, Condensed matter
影响因子:
--
作者:
Giorgini;Pitaevskii;Stringari
通讯作者:
Giorgini;Pitaevskii;Stringari
DOI:
--
发表时间:
2004
期刊:
影响因子:
--
作者:
A. Klein;M. Fleischhauer
通讯作者:
M. Fleischhauer
DOI:
--
发表时间:
1968
期刊:
影响因子:
--
作者:
N. H. March;W. H. Young;S. Sampanthar;D. Kobe
通讯作者:
D. Kobe
DOI:
--
发表时间:
1962
期刊:
影响因子:
--
作者:
A. Miller;D. Pines;P. Nozières
通讯作者:
P. Nozières