Numerical analysis of ballistic-electron transport in magnetic fields by using a quantum point contact and a quantum wire

Autor:	Motomu Takatsu, Naoki Yokoyama, Miyoshi Saito, Tatsuya Usuki, R. A. Kiehl
Rok vydání:	1995
Předmět:	Physics Classical mechanics Numerical analysis Quantum electrodynamics Quantum wire Quantum point contact Quantum oscillations Wave function Quantum Lattice model (physics) Magnetic field
Zdroj:	Physical Review B. 52:8244-8255
ISSN:	1095-3795 0163-1829
DOI:	10.1103/physrevb.52.8244
Popis:	We report the numerical analysis of our experimental results for electron-wave propagation from a quantum point contact to a quantum wire. Our numerical method solves the boundary problem of a lattice model, and determines wave functions at an arbitrary site. This method also includes a recursive Green's-function method. Our study found oscillations in the conductance, and magnetic suppression of those oscillations. For a simple model, we simulate the oscillations directly related to the channel number in the quantum wire. To understand the magnetic suppression, we investigate the dependence of the electron-wave propagation on the magnetic field using a realistic model. Numerical results show that a realistic rounded corner at the point-contact and a magnetic field could suppress the oscillations. We also discuss the transition from a classical skipping orbit with clear circular segments and focusing to a quantum edge state along a potential wall.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::480c6fa19f227f42354e779dd06228f9 https://doi.org/10.1103/physrevb.52.8244 Zobrazit plný text záznamu