Quantum interference in nanometric devices: Ballistic transport across arrays of T-shaped quantum wires

We propose a four-terminal nano device made of quantum wires with Rashba spin-orbit (SO) coupling. In each terminal there are several independent channels formed with quantum wires. The coherent transmission of electrons in such a nano system is a combined effect of quantum interference and spin precession. When defining two opposite terminals as source and drain leads, the charge and spin currents in channels of other two terminals exhibit spatial distributions which reflect the competition between spin precession and quantum interference during the tunneling of electrons. Since the four-terminal nano device is geometrically simple for the moving paths of charge and spin, our investigation may shed some light on the basic physical picture on this issue.

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Quantum interference and conductance in silicon quantum wires

10.1117/12.347405 ◽

1999 ◽

Author(s):

Nikolai T. Bagraev ◽

Wolfgang Gehlhoff ◽

Vadim K. Ivanov ◽

Leonid E. Klyachkin ◽

Anna M. Malyarenko ◽

...

Keyword(s):

Quantum Interference ◽

Quantum Wires ◽

Silicon Quantum Wires

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Ballistic transport in quantum wires with periodic bend structure

Solid State Communications ◽

10.1016/0038-1098(93)90009-c ◽

1993 ◽

Vol 85 (6) ◽

pp. 507-511 ◽

Cited By ~ 2

Author(s):

Karel Vacek ◽

Ayao Okiji ◽

Hideaki Kasai

Keyword(s):

Quantum Wires ◽

Ballistic Transport

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Gate-Controlled Electron Quantum Interference Logic Devices

10.21203/rs.3.rs-344031/v2 ◽

2021 ◽

Author(s):

Josef Weinbub ◽

Mauro Ballicchia ◽

Mihail Nedjalkov

Keyword(s):

Information Processing ◽

Integrated Circuits ◽

Quantum Interference ◽

Ballistic Transport ◽

Logic Gates ◽

Attractive Alternative ◽

Logic Device ◽

Wave Nature ◽

New Type ◽

Electron Quantum

Abstract Inspired by using the wave nature of electrons for electron quantum optics, we propose a new type of electron quantum interference logic device (eQILD), where an electron wave is coherently injected into a two-dimensional wave guide and controlled via two gates. Interference effects lead to different current levels in output channels and are utilized for classical logic gates. eQILDs can be reconfigured and support parallelism and multi-valued logic. The operating principle as well as realizations of a logic NAND and NOR gate is shown by means of dynamic quantum Wigner and classical simulations considering coherent/ballistic transport. Contrary to other advanced information processing approaches no magnetic or photonic mechanisms are required. The eQILD is inherently compatible with conventional integrated circuits and thus provides an attractive alternative towards advanced low-power information processing devices with the performance only limited by the single-electron source frequency, i.e., in the GHz regime.

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SPIN BALLISTIC TRANSPORT AND SPIN CURRENT OSCILLATIONS IN MESOSCOPIC LOOP STRUCTURES

International Journal of Modern Physics B ◽

10.1142/s0217979207043415 ◽

2007 ◽

Vol 21 (08n09) ◽

pp. 1674-1680

Author(s):

IGOR TRALLE ◽

WIOLETTA PAŚKO

Keyword(s):

Wave Function ◽

Quantum Interference ◽

Ballistic Transport ◽

Spin Current ◽

Phase Coherence ◽

Larmor Precession ◽

Phase Relaxation ◽

Relaxation Length ◽

Spin Part ◽

Orbital Part

In the paper a theory of quantum interference in a loop structure caused by spin coherent transport and the Larmor precession of the electron spin is presented. The 'spin ballistic' regime is supposed to occur when the phase relaxation length of the spin part of electron wave function is much greater than the phase relaxation length of the 'orbital' part. If magnetic fields in two arms of the structure are different, the spin part of the wave function acquires a phase shift due to spin precession around the field. If the structure length L is chosen to be [Formula: see text], It is possible to 'wash out' the quantum interference related to the phase coherence of the 'orbital part' of the wave function, retaining at the same time that related to the phase coherence of the spin part and to reveal the corresponding conductance oscillations. Different mechanisms of spin relaxation as well as their influence on the spin transport are considered. The quantum interference in the time-dependent magnetic field is also discussed and similarities between this effect and Josephson one, as well as their differences are considered.

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Gate-Controlled Electron Quantum Interference Logic Devices

10.21203/rs.3.rs-344031/v1 ◽

2021 ◽

Author(s):

Josef Weinbub ◽

Mauro Ballicchia ◽

Mihail Nedjalkov

Keyword(s):

Information Processing ◽

Integrated Circuits ◽

Quantum Interference ◽

Ballistic Transport ◽

Logic Gates ◽

Attractive Alternative ◽

Logic Device ◽

Wave Nature ◽

New Type ◽

Electron Quantum

Abstract Recent advances in electron quantum optics show the breathtaking progress in utilizing the electron's wave nature. Inspired by these advances, we propose a new type of electron quantum interference logic device (eQILD), where an electron wave is coherently injected into a two-dimensional (2D) wave guide and controlled via two gates. Interference effects lead to different current levels in output channels and are utilized for classical logic gates. The operating principle is shown by means of dynamic quantum Wigner and classical simulations considering coherent/ballistic transport. Contrary to other advanced information processing approaches no magnetism nor bosonic systems are required. The eQILD is inherently compatible with conventional integrated circuits and thus provides an attractive alternative towards advanced low-power information processing devices with the performance only limited by the single-electron source frequency being in the GHz regime.

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