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arXiv 1302.4501cond-mat.mes-hall
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空穴量子输运的巨电导和相时反常事件

Giant conductance and phase time anomalous events of hole quantum transport

S. Arias-Laso, L. Diago-Cisneros

摘要:

本文用多分量散射理论研究了巨电导事件和空穴相位传输时间的反常现象。在此基础上,得到了非耦合空穴输运中么正关系的新解析表达式,并直接应用于研究双势垒共振隧穿(DBRT)和超晶格$GaAs$ -包层$/(AlAs/GaAs)^{n}/GaAs$ -包层中电导和相位传输时间的行为。在没有价带混合的情况下,发现空穴通过DBRT和超晶格传输时存在巨电导现象的明显证据,通过控制超晶格层数和考虑价带粒子耦合,巨电导效应失去了鲁棒性.通过异质结构的相位时间表现出极端的依赖性,在间隙和障碍,如之前报道的电子。我们已经检测到一个较早的到达阶段的时间内的障碍,在零点几皮秒的顺序的两种口味的孔的传播。一个有吸引力的过滤器一样的效果,每当一个选择性的限制强度独立出现的两种口味的孔在解耦制度。我们的研究结果还规定了显着的证据,为解耦和耦合的空穴通量,类似于哈特曼所预言的,在传输的电子通过不透明的障碍。

英文摘要:

Events of giant conductance and anomalies of the phase transmission time for holes, are theoretically investigated within the multicomponent scattering approach. Based on this model, new analytical expressions for unitarity relations in the uncoupled hole transport are obtained and directly applied to study the behavior of the conductance and the phase transmission time in a double barrier resonant tunneling (DBRT) and a superlattice $GaAs$-cladding layer$/(AlAs/GaAs)^{n}/GaAs$-cladding layer. Clear-signature evidences of giant conductance phenomena for hole transmission without valence-band mixing through a DBRT and a superlattice were found. The giant conductance effect losses robustness by manipulating the number of superlattice layers and by including the valence-band particles coupling as well. Phase time through the heterostructure exhibits extremal dependencies in the gaps and in the barriers, as those reported before for electrons. We have detected an earlier arrival phase time for the propagation of both flavors of holes within the barrier, in the order of few tenths of picoseconds. An appealing filter-like effect is presented, whenever a selective confinement strength arises independently for both flavors of holes in the uncoupled regime. Our results also prescribe noticeable evidences for both uncoupled and coupled hole fluxes, similar to those foretold by Hartman, upon transmission of electrons through opaque barriers.

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