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Aharonov–Bohm oscillations and equilibrium current distributions in open quantum dot and in ring interferometer

Olga A. Tkachenko 1
Olga A. Tkachenko
, 
Dmitry G. Baksheev 1
Dmitry G. Baksheev
, 
Vitaly A. Tkachenko 1, 2
Vitaly A. Tkachenko
1 Rzhanov Institute of Semiconductor Physics, Siberian Branch, Russian Academy of Sciences, 13 Akad. Lavrent’eva Ave., Novosibirsk, 630090, Russia
2 Novosibirsk State University, 1 Pirogova Str., Novosibirsk, 630090, Russia
10.3897/j.moem.6.2.58576
Published 30 June 2020
Communication , Volume 6, Issue 2, 59-64
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Tkachenko O. A., Baksheev D. G., Tkachenko V. A. Aharonov–Bohm oscillations and equilibrium current distributions in open quantum dot and in ring interferometer // Modern Electronic Materials. 2020. Vol. 6. No. 2. pp. 59-64.
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Tkachenko O. A., Baksheev D. G., Tkachenko V. A. Aharonov–Bohm oscillations and equilibrium current distributions in open quantum dot and in ring interferometer // Modern Electronic Materials. 2020. Vol. 6. No. 2. pp. 59-64.
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TY - JOUR
DO - 10.3897/j.moem.6.2.58576
UR - https://moem.colab.ws/publications/10.3897/j.moem.6.2.58576
TI - Aharonov–Bohm oscillations and equilibrium current distributions in open quantum dot and in ring interferometer
T2 - Modern Electronic Materials
AU - Tkachenko, Olga A.
AU - Baksheev, Dmitry G.
AU - Tkachenko, Vitaly A.
PY - 2020
DA - 2020/06/30
PB - НИТУ МИСИС
SP - 59-64
IS - 2
VL - 6
ER -
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@article{2020_Tkachenko,
author = {Olga A. Tkachenko and Dmitry G. Baksheev and Vitaly A. Tkachenko},
title = {Aharonov–Bohm oscillations and equilibrium current distributions in open quantum dot and in ring interferometer},
journal = {Modern Electronic Materials},
year = {2020},
volume = {6},
publisher = {НИТУ МИСИС},
month = {Jun},
url = {https://moem.colab.ws/publications/10.3897/j.moem.6.2.58576},
number = {2},
pages = {59--64},
doi = {10.3897/j.moem.6.2.58576}
}
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Tkachenko, Olga A., et al. “Aharonov–Bohm oscillations and equilibrium current distributions in open quantum dot and in ring interferometer.” Modern Electronic Materials, vol. 6, no. 2, Jun. 2020, pp. 59-64. https://moem.colab.ws/publications/10.3897/j.moem.6.2.58576.
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Keywords

Aharonov–Bohm oscillations
ballistic quantum dot
conductance
equilibrium current
magnetic moment
ring electron interferometer

Abstract

Magnetotransport in two submicron-sized devices formed on the basis of GaAs/AlGaAs structures has been simulated using nonequilibrium Green functions. The effect of a perpendicular magnetic field on quantum transport in a quasi-one-dimensional quantum dot and in an Aharonov–Bohm interferometer has been analyzed in a single-particle approximation. Magnetic field oscillations of two-terminal conductance of the devices, equilibrium (persistent) current distributions and magnetic moment generated in the devices by persistent currents have been determined using numerical methods. Correlations between the magnetic moment, magnetic field oscillations of conductance and energy resonance in a specific magnetic field have been traced. Sufficiently regular conductance oscillations similar to Aharonov–Bohm ones have been revealed for a quasi-one-dimensional quantum dot at small magnetic fields (0.05–0.4 T). For a ring interferometer the contribution to the total equilibrium current and magnetic moment at a specific energy may change abruptly both in magnitude and in sign as a result of changing magnetic field within one Aharonov–Bohm oscillation. We show that the conductance of an interferometer is determined not by the number of modes propagating in the ring but rather by the effect of triangular quantum dots at the ring entrance that produce a strong reflection. The period of the calculated Aharonov–Bohm oscillations is in agreement with the measurement results for these devices.

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