Electronic transport in quantum cascade structures at equilibrium
Electronic transport in quantum cascade structures at equilibrium
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DOI：
10.1103/physrevb.74.235325
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发表时间：
2006-12-01
影响因子：
3.7
通讯作者：
Berger, V.
中科院分区：
文献类型：
--
作者：
Koeniguer, C.;Dubois, G.;Berger, V.
从理论上描述了复杂多量子阱异质结构中的输运。该模型的重点是量子级联探测器，这是一个令人兴奋的挑战，由于结构的复杂性，包含七个或八个不同宽度的量子威尔斯。电子输运可以完全描述没有任何其他可调参数比掺杂浓度。从一个子带到另一个子带的扩散是用标准的电子光学声子哈密顿量计算的，并且电子输运是由使用通过不同子带的所有可能路径的电子的平行流动产生的。最后，给出了这种复杂器件的电阻的简单表达式，与实验结果吻合良好。该关系涉及从设备的一个周期到下一个周期的子带之间的转换速率的总和。这种关系表现为适用于复杂多量子结构的爱因斯坦关系。
The transport in complex multiple quantum well heterostructures is theoretically described. The model is focused on quantum cascade detectors, which represent an exciting challenge due to the complexity of the structure containing seven or eight quantum wells of different widths. Electronic transport can be fully described without any other adjustable parameter than the doping density. Diffusion from one subband to another is calculated with a standard electron-optical phonon Hamiltonian, and the electronic transport results from a parallel flow of electrons using all the possible paths through the different subbands. Finally, the resistance of such a complex device is given by a simple expression, with an excellent agreement with experimental results. This relation involves the sum of transitions rates between subbands, from one period of the device to the next one. This relation appears as an Einstein relation adapted to the case of complex multiple quantum structures.