Doublon relaxation in the Bose-Hubbard model.
Doublon relaxation in the Bose-Hubbard model.
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DOI：
10.1103/physrevlett.108.085302
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发表时间：
2011-04
影响因子：
8.6
通讯作者：
A. Chudnovskiy;D. Gangardt;A. Kamenev
中科院分区：
文献类型：
--
作者：
A. Chudnovskiy;D. Gangardt;A. Kamenev
窄带晶格中高能双占据态（doublon）的衰变需要产生相干的多粒子激发。这导致这种状态的指数长弛豫时间。我们表明，如果平均占用数是足够小的，相应的指数可以准确地评估。为此，我们发展了准经典方法来计算高阶树能级衰变振幅。
The decay of a high-energy double occupancy state, doublon, in a narrow-band lattice requires the creation of a coherent many-particle excitation. This leads to an exponentially long relaxation time of such a state. We show that, if the average occupation number is sufficiently small, the corresponding exponent may be evaluated exactly. To this end we develop the quasiclassical approach to calculation of the high-order tree-level decay amplitudes.