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

Double-Channel Electron Transport in Suspended Quantum Point Contacts with in-Plane Side Gates

2020 ◽  
Vol 54 (12) ◽  
pp. 1605-1610
Author(s):  
D. A. Pokhabov ◽  
A. G. Pogosov ◽  
E. Yu. Zhdanov ◽  
A. K. Bakarov ◽  
A. A. Shklyaev
Keyword(s):  
Electron Transport ◽  
Quantum Point Contacts ◽  
Point Contacts ◽  
Quantum Point ◽  
Double Channel

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.

Theory of optical-phonon limited hot-electron transport in quantum wires

1996 ◽  
Vol 54 (24) ◽  
pp. 17838-17849 ◽  
Author(s):  
N. A. Zakhleniuk ◽  
C. R. Bennett ◽  
N. C. Constantinou ◽  
B. K. Ridley ◽  
M. Babiker
Keyword(s):  
Electron Transport ◽  
Optical Phonon ◽  
Quantum Wires ◽  
Hot Electron ◽  
Hot Electron Transport

Quasi-ballistic electron transport in atomic wires

2017 ◽  
Author(s):  
Jan M. van Ruitenbeek
Keyword(s):  
Electron Transport ◽  
Single Atom ◽  
Point Contacts ◽  
Atomic Size ◽  
Atomic Wires ◽  
Ballistic Electron ◽  
Metal Atoms ◽  
Ballistic Electron Transport ◽  
Wide Range ◽  
Conduction Properties

This article describes quasi-ballistic electron transport in atomic wires. It begins with a review of experiments on the conduction properties for single metal atoms. Nearly all the information on the properties of such nanocontacts should be extracted from the current and voltage only. Nevertheless, a wide range of techniques has been developed to obtain detailed information. The article proceeds by considering various experimental techniques for characterizing single-atom contacts, along with their application for the study of conducting chains of individual metal atoms and for metal–molecule–metal junctions. Using metallic point contacts and molecular junctions that are of atomic size, it demonstrates that the transport of electrons can be quasi-ballistic and the deviations from perfect transmission can be quantified and interpreted.

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