TY - JOUR

T1 - Conductance Quantization Features in Multichannel Quantum Point Contacts

AU - Pokhabov, D. A.

AU - Pogosov, A. G.

AU - Shevyrin, A. A.

AU - Zhdanov, E. Yu.

AU - Bakarov, A. K.

N1 - The work was supported by the Russian Science Foundation (project no. 22-12-00343, experimental measurements and theoretical simulation) and by the Ministry of Science and Higher Education of The Russian Federation (project no. FWGW-2022-0011, characterization of the initial structures).

PY - 2024/3/1

Y1 - 2024/3/1

N2 - A multichannel electron transport mode with independent conductance quantization in individual channels is implemented and studied in quantum point contacts with side gates. Simulation of the total conductance as the sum of quantized individual conductances reproduces the experimentally observed complex conductance dependence on the sum and difference of gate voltages in this regime. The considered model reproduces the following experimentally observed features of conductance quantization: the absence of some of the plateaus, the conductance steps equal to and other values different from, the plateaus appearing at non-multiples of, the evolution of the anomalous plateaus with a change in gate voltage difference, and the low visibility of some plateaus. The study shows that a non-trivial experimentally observed conductance behavior in quantum point contacts may originate from channel multiplicity which may not be obvious in advance.

AB - A multichannel electron transport mode with independent conductance quantization in individual channels is implemented and studied in quantum point contacts with side gates. Simulation of the total conductance as the sum of quantized individual conductances reproduces the experimentally observed complex conductance dependence on the sum and difference of gate voltages in this regime. The considered model reproduces the following experimentally observed features of conductance quantization: the absence of some of the plateaus, the conductance steps equal to and other values different from, the plateaus appearing at non-multiples of, the evolution of the anomalous plateaus with a change in gate voltage difference, and the low visibility of some plateaus. The study shows that a non-trivial experimentally observed conductance behavior in quantum point contacts may originate from channel multiplicity which may not be obvious in advance.

UR - https://www.scopus.com/record/display.uri?eid=2-s2.0-85185925474&origin=inward&txGid=7b553c05669d7863a7b3d8a18303991b

U2 - 10.1134/S0021364024600332

DO - 10.1134/S0021364024600332

M3 - Article

VL - 119

SP - 380

EP - 388

JO - JETP Letters

JF - JETP Letters

SN - 0021-3640

IS - 5

ER -