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首页> 外文期刊>Physical review >Confined electron states in two-dimensional HgTe in magnetic field: Quantum dot versus quantum ring behavior
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Confined electron states in two-dimensional HgTe in magnetic field: Quantum dot versus quantum ring behavior

机译：磁场中二维HGTE中的限制电子状态：量子点与量子环行为

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摘要

We investigate the electron states and optical absorption in square- and hexagonal-shaped two-dimensional (2D) HgTe quantum dots and quantum rings in the presence of a perpendicular magnetic field. The electronic structure is modeled by means of the sp(3)d(5)s* tight-binding method within the nearest-neighbor approximation. Both bulklike and edge states appear in the energy spectrum. The bulklike states in quantum rings exhibit Aharonov-Bohm oscillations in magnetic field, whereas no such oscillations are found in quantum dots, which is ascribed to the different topology of the two systems. When magnetic field varies, all the edge states in square quantum dots appear as quasibands composed of almost fully flat levels, whereas some edge states in quantum rings are found to oscillate with magnetic field. However, the edge states in hexagonal quantum dots are localized like in rings. The absorption spectra of all the structures consist of numerous absorption lines, which substantially overlap even for small line broadening. The absorption lines in the infrared are found to originate from transitions between edge states. It is shown that the magnetic field can be used to efficiently tune the optical absorption of HgTe 2D quantum dot and quantum ring systems.
机译：在存在垂直磁场的情况下，我们研究了方形和六边形二维（2D）HGTE量子点和量子环中的电子状态和光学吸收。电子结构通过最近邻近近似的SP（3）D（5）S *紧密绑定方法进行建模。 Bulklike和Edge状态都出现在能谱中。量子环中的散装状态在磁场中表现出Aharonov-BoHM振荡，而在量子点中没有发现这种振荡，这归因于两个系统的不同拓扑。当磁场变化时，方形量子点中的所有边缘状态显示为由几乎完全平坦的水平组成的拟链条，而在磁场中发现量子环中的一些边缘状态振荡。然而，六边形量子点中的边缘状态在环中局部地。所有结构的吸收光谱由许多吸收管线组成，即使对于小型线宽均匀，也基本上重叠。发现红外线中的吸收线源自边缘状态之间的过渡。结果表明，磁场可用于有效地调整HGTE 2D量子点和量子环系统的光学吸收。

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  • 来源
    《Physical review》 |2019年第12期|125304.1-125304.9|共9页
  • 作者

    Topalovic Dusan B.; Arsoski Vladimir V.; Tadic Milan Z.; Peeters Francois M.;

  • 作者单位

    Univ Belgrade Sch Elect Engn POB 35-54 Belgrade 11120 Serbia|Univ Belgrade Vinca Inst Nucl Sci POB 522 Belgrade 11001 Serbia;

    Univ Belgrade Sch Elect Engn POB 35-54 Belgrade 11120 Serbia;

    Univ Belgrade Sch Elect Engn POB 35-54 Belgrade 11120 Serbia;

    Yunnan Univ Sch Phys & Astron Kunming 650091 Yunnan Peoples R China|Yunnan Univ Yunnan Key Lab Quantum Informat Kunming 650091 Yunnan Peoples R China|Univ Antwerp Dept Phys Groenenborgerlaan 171 B-2020 Antwerp Belgium;

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