Phonon distributions of a single-bath mode coupled to a quantum dot
Phonon distributions of a single-bath mode coupled to a quantum dot
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DOI：
10.1088/1367-2630/10/11/115004
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发表时间：
2008-11-20
影响因子：
3.3
通讯作者：
Sassetti, M.
中科院分区：
文献类型：
--
作者：
Cavaliere, F.;Piovano, G.;Sassetti, M.
在旋转波近似中研究了与量子点耦合的非常规单模声子浴的特性。通过点的电子电流引起不平衡浴，其声子分布与热分布有本质上的不同。在选定的传输机制中，这种分布的特点是少数声子模式的特殊选择性群体，并且可以表现出亚泊松行为。结果表明，点的双重占据有利于这种亚泊松行为。探索了从不平衡热浴到传统热浴的交叉，并讨论了旋转波近似的局限性。
The properties of an unconventional, single-mode phonon bath coupled to a quantum dot are investigated within the rotating wave approximation. The electron current through the dot induces an out of equilibrium bath, with a phonon distribution qualitatively different from the thermal one. In selected transport regimes, such a distribution is characterized by a peculiar selective population of few phonon modes and can exhibit sub-Poissonian behavior. It is shown that such sub-Poissonian behavior is favored by a double occupancy of the dot. The crossover from an unequilibrated to a conventional thermal bath is explored, and the limitations of the rotating wave approximation are discussed.