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arXiv 0909.0154cond-mat.mes-hall
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半导体量子阱中的量子态凹陷

Quantum state depression in semiconductor quantum well

Avto Tavkhelidze, Vasiko Svanidze

摘要:

本文研究了半导体量子阱中的量子态凹陷。QSD来自QW边界的脊状几何。脊对电子波函数施加了额外的边界条件,某些量子态成为禁戒态。态密度在包括导带(CB)在内的所有能带中降低。因此,由于泡利不相容原理,从填充带排斥的电子必须占据空带中的量子态。CB中的电子浓度和费米能都增加,如在施主掺杂的情况下。由于量子态密度降低,脊状量子阱(RQW)在接近200 nm的宽度处表现出量子特性。宽RQW可用于改善基于QW的光电子器件中的光子约束。态密度的降低增加了载流子迁移率,并使半导体QW器件中的弹道输运机制更加明显。此外,QSD掺杂不会引入散射中心,并且可以用于电力电子学。

英文摘要:

In this study, the quantum state depression (QSD) in semiconductor quantum well (QW) is investigated. The QSD emerge from the ridged geometry of the QW boundary. Ridges impose additional boundary conditions on the electron wave function and some quantum states become forbidden. State density reduces in all energy bands, including conduction band (CB). Hence, electrons, rejected from the filled bands, must occupy quantum states in the empty bands due to Pauli Exclusion principle. Both the electron concentration in CB and Fermi energy increases as in the case of donor doping. Since quantum state density is reduced, the ridged quantum well (RQW) exhibits quantum properties at widths approaching 200 nm. Wide RQW can be used to improve photon confinement in QW-based optoelectronics devices. Reduction in the state density increases the carrier mobility and makes the ballistic transport regime more pronounced in the semiconductor QW devices. Furthermore, the QSD doping does not introduce scattering centers and can be used for power electronics.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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