کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5491923 1525136 2017 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Electrically controlled crossing of energy levels in quantum dots in two-dimensional topological insulators
ترجمه فارسی عنوان
انتقال الکتریکی سطوح انرژی در نقاط کوانتومی در مقره های توپولوژیک دو بعدی
موضوعات مرتبط
مهندسی و علوم پایه فیزیک و نجوم فیزیک ماده چگال
چکیده انگلیسی

We study the energy spectra of bound states in quantum dots (QDs) formed by an electrostatic potential in two-dimensional topological insulator (TI) and their transformation with changes in QD depth and radius. It is found that, unlike a trivial insulator, the energy difference between the levels of the ground state and first excited state can decrease with decreasing the radius and increasing the depth of the QD so that these levels intersect under some critical condition. The crossing of the levels results in unusual features of optical properties caused by intraceneter electron transitions. In particular, it leads to significant changes of light absorption due to electron transitions between such levels and to the transient electroluminescence induced by electrical tuning of QD and TI parameters. In the case of magnetic TIs, the polarization direction of the absorbed or emitted circularly polarized light is changed due to the level crossing.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Physica B: Condensed Matter - Volume 513, 15 May 2017, Pages 1-6
نویسندگان
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