Confined electron states in two-dimensional HgTe in magnetic field: Quantum dot versus quantum ring behavior
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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 sp3d5s∗ 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. © 2019 American Physical Society.
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Physical Review B, 2019, 100, 12, 125304-Финансирање / пројекти:
- Интегрална студија идентификације регионалних генетских фактора ризика и фактора ризика животне средине за масовне незаразне болести хумане популације у Србији - INGEMA_S (RS-MESTD-Integrated and Interdisciplinary Research (IIR or III)-41028)
- Унапређење енергетских карактеристика и квалитета унутрашњег простора у зградама образовних установа у Србији са утицајем на здравље (RS-MESTD-Integrated and Interdisciplinary Research (IIR or III)-42008)
- Оптоелектронски нанодимензиони системи - пут ка примени (RS-MESTD-Integrated and Interdisciplinary Research (IIR or III)-45003)
- Flemish Science Foundation (FWO-Vl)
DOI: 10.1103/PhysRevB.100.125304
ISSN: 2469-9950
WoS: 000486638400007
Scopus: 2-s2.0-85072805754
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VinčaTY - JOUR AU - Topalović, Dušan AU - Arsoski, Vladimir AU - Tadić, Milan Ž. AU - Peeters, François M. PY - 2019 UR - https://vinar.vin.bg.ac.rs/handle/123456789/8534 AB - 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 sp3d5s∗ 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. © 2019 American Physical Society. T2 - Physical Review B T1 - Confined electron states in two-dimensional HgTe in magnetic field: Quantum dot versus quantum ring behavior VL - 100 IS - 12 SP - 125304 DO - 10.1103/PhysRevB.100.125304 ER -
@article{ author = "Topalović, Dušan and Arsoski, Vladimir and Tadić, Milan Ž. and Peeters, François M.", year = "2019", abstract = "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 sp3d5s∗ 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. © 2019 American Physical Society.", journal = "Physical Review B", title = "Confined electron states in two-dimensional HgTe in magnetic field: Quantum dot versus quantum ring behavior", volume = "100", number = "12", pages = "125304", doi = "10.1103/PhysRevB.100.125304" }
Topalović, D., Arsoski, V., Tadić, M. Ž.,& Peeters, F. M.. (2019). Confined electron states in two-dimensional HgTe in magnetic field: Quantum dot versus quantum ring behavior. in Physical Review B, 100(12), 125304. https://doi.org/10.1103/PhysRevB.100.125304
Topalović D, Arsoski V, Tadić MŽ, Peeters FM. Confined electron states in two-dimensional HgTe in magnetic field: Quantum dot versus quantum ring behavior. in Physical Review B. 2019;100(12):125304. doi:10.1103/PhysRevB.100.125304 .
Topalović, Dušan, Arsoski, Vladimir, Tadić, Milan Ž., Peeters, François M., "Confined electron states in two-dimensional HgTe in magnetic field: Quantum dot versus quantum ring behavior" in Physical Review B, 100, no. 12 (2019):125304, https://doi.org/10.1103/PhysRevB.100.125304 . .