Quasiballistic quantum interferometer

Быков, А. А.; Квон, З. Д.; Ol'shanskii, E B; Aseev, A. L.; Baklanov, Mikhaı̈l R.; Litvin, L. V.; Nastaushev, Yu. V.; Мансуров, В. Г.; Migal, V. P.; Moshchenko, S. P.

doi:10.1070/pu1995v038n02abeh001464

Cited by 4 publications

(7 citation statements)

References 5 publications

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“…The area S is usually evaluated using the following formula suggested by simple one-dimensional models of ring and edge current states: S = Φ 0 /ΔB, where ΔB is the period of the Aharonov-Bohm oscillations and Φ 0 = h/e is the magnetic flux quantum. For ~1 µm rings in 2D electron gas this evaluation is in a good agreement with the electron microscopic image of the etched-off areas or metallic gate systems forming the electronic nanosystem in a real solid state device [1]. However the applicability of this formula has not been verified for quantum dots at small B when the edge current states have not been formed yet.…”

Section: Introductionsupporting

confidence: 64%

“…Flexibly controlled submicron devices formed on the basis of high-mobility 2D electron gas and GaAs/ AlGaAs heterostructures have been the main object of experimental quantum nanophysics. For example, one-particle interference phenomena in the conductance G are most often studied in small open ballistic nanosystems in the form of a ring or a quantum dot [1][2][3] connected with 2D reservoirs via two narrow entrances. The conductance of a nanosized device is defined as G = I/V, where I is the nonequilibrium current generated by the small voltage V between the electron reservoirs.…”

Section: Introductionmentioning

confidence: 99%

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

Ткаченко¹,

Baksheev²,

Ткаченко³

2020

MoEM

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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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Section: Introductionsupporting

confidence: 64%

Section: Introductionmentioning

confidence: 99%

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

Ткаченко¹,

Baksheev²,

Ткаченко³

2020

MoEM

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“…In the absence of a dc driving voltage, these frequencies cast dc currents from 0.1 nA to a few nA. These currents are small but within the range observed in experiments on Aharanov-Bohm rings (see 3,[43][44][45][46].…”

Section: Discussionmentioning

confidence: 79%

Pumping charge with ac magnetic fluxes and the dynamical breakdown of Onsager symmetry

Ludovico

Arrachea

2013

Phys. Rev. B

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We study the transport properties of setups with one and two mesoscopic rings threaded by ac magnetic fluxes of the form (t) = dc + ac cos( 0 t + δ) and connected to two different particle reservoirs. We analyze the conditions to generate a pumped dc current in the adiabatic regime. We also study the symmetry properties of the induced dc current as a function of the static component of the flux dc with and without a dc bias voltage applied at the reservoirs. We analyze, in particular, the validity of the Onsager-Casimir relations for different configurations of the setups.

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“…In solid-state systems, quantum rings have attracted much attention for a long time because they provide a unique opportunity for the study of electron interference in the simplest form. [1][2][3][4][5] For electrons traveling along different ring arms, the waves acquire a phase shift due to the Aharonov-Bohm (AB) effect. The phase difference is given by 2π (φ/φ 0 ) where φ = πr 2 0 B is the magnetic flux enclosed by the ring with a radius r 0 in the presence of magnetic field B, and φ 0 is the flux quantum.…”

Section: Introductionmentioning

confidence: 99%

Linear and nonlinear transport in a small charge-tunable open quantum ring

et al. 2011

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We experimentally study the Aharonov-Bohm-conductance oscillations under external gate voltage in a semiconductor quantum ring with a radius of 80 nm. We find that, in the linear regime, the resistance-oscillation plot in the voltage-magnetic-field plane corresponds to the quantum ring energy spectra. The chessboard pattern assembled by resistance diamonds, while loading the ring, is attributed to a short electron lifetime in the open configuration, which agrees with calculations within the single-particle model. Remarkably, the application of a small dc current allows observing strong deviations in the oscillation plot from this pattern accompanied by a magnetic-field symmetry break. We relate such behavior to the higher-order-conductance coefficients determined by electron-electron interactions in the nonlinear regime.

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Quasiballistic quantum interferometer

Cited by 4 publications

References 5 publications

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

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

Pumping charge with ac magnetic fluxes and the dynamical breakdown of Onsager symmetry

Linear and nonlinear transport in a small charge-tunable open quantum ring

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