Electron Transport in Quantum Wires with Tunneling Barrier in Magnetic Fields

1999 ◽  
Vol 68 (4) ◽  
pp. 1464-1464 ◽  
Author(s):  
Katsuki Amemiya
Keyword(s):  
Electron Transport ◽  
Magnetic Fields ◽  
Quantum Wires ◽  
Tunneling Barrier

Subband Structure of Quantum Wires in Magnetic Fields

1993 ◽  
Vol 62 (9) ◽  
pp. 2986-2989 ◽  
Author(s):  
Tatsuo Suzuki ◽  
Tsuneya Ando
Keyword(s):  
Magnetic Fields ◽  
Quantum Wires ◽  
Subband Structure

scholarly journals Electron transport through quantum wires and point contacts

2004 ◽  
Vol 70 (23) ◽  
Author(s):  
P. Havu ◽  
M. J. Puska ◽  
R. M. Nieminen ◽  
V. Havu
Keyword(s):  
Electron Transport ◽  
Quantum Wires ◽  
Point Contacts

Electronic properties of semiconductor quantum wires for shallow symmetric and asymmetric confinements

2021 ◽  
Author(s):  
Irina I. Yakimenko ◽  
Ivan P. Yakimenko
Keyword(s):  
Electron Transport ◽  
Density Functional ◽  
Quantum Wires ◽  
Zero Magnetic Field ◽  
Electron Interaction ◽  
Spin Polarized ◽  
Quantum Point ◽  
Dimensional Electron Gas ◽  
The One ◽  
Quantum Technology

Abstract Quantum wires (QWs) and quantum point contacts (QPCs) have been realized in GaAs/AlGaAs heterostructures in which a two-dimensional electron gas (2DEG) resides at the interface between GaAs and AlGaAs layered semiconductors. The electron transport in these structures has previously been studied experimentally and theoretically, and a 0.7 conductance anomaly has been discovered. The present paper is motivated by experiments with a QW in shallow symmetric and asymmetric confinements that have shown additional conductance anomalies at zero magnetic field. The proposed device consists of a QPC that is formed by split gates and a top gate between two large electron reservoirs. This paper is focused on the theoretical study of electron transport through a wide top-gated QPC in a low-density regime and is based on density functional theory. The electron-electron interaction and shallow confinement make the splitting of the conduction channel into two channels possible. Each of them becomes spin-polarized at certain split and top gates voltages and may contribute to conductance giving rise to additional conductance anomalies. For symmetrically loaded split gates two conduction channels contribute equally to conductance. For the case of asymmetrically applied voltage between split gates conductance anomalies may occur between values of 0.25(2e2/h) and 0.7(2e2/h) depending on the increased asymmetry in split gates voltages. This corresponds to different degrees of spin-polarization in the two conduction channels that contribute differently to conductance. In the case of a strong asymmetry in split gates voltages one channel of conduction is pinched off and just the one remaining channel contributes to conductance. We have found that on the perimeter of the anti-dot there are spin-polarized states. These states may also contribute to conductance if the radius of the anti-dot is small enough and tunnelling between these states may occur. The spin-polarized states in the QPC with shallow confinement tuned by electric means may be used for the purposes of quantum technology.

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