Low Temperature Physics: 41, 98 (2015); https://doi.org/10.1063/1.4913204
Fizika Nizkikh Temperatur: Volume 41, Number 2 (February 2015), p. 129-138    ( to contents , go back )

Quantum transport through a multilevel magnetic structure with taking into account multiple inelastic scattering in magnetic field

V.V. Val’kov1, S.V. Aksenov1, and E.A. Ulanov2

1L.V. Kirenskiy Institute of Physics, Siberian Branch of the Russian Academy of Sciences Krasnoyarsk 660036, Russia

2Сибирский государственный аэрокосмический университет, г. Красноярск, 660014, Россия
E-mail: vvv@iph.krasn.ru, asv86@iph.krasn.ru
pos Анотація:

Received October 6, 2014

Abstract

A solution of the problem of quantum electron transport through a magnetic atom adsorbed in the metal break junction is presented. By the experimental data it was assumed that the conduction electrons experienced inelastic scattering by the adsorbate due to the sd(f)-exchange interaction. The Keldysh technique was used to provide a general expression describing the current through the multilevel structure at finite temperatures in terms of the nonequilibrium Green function. The use of the atomic statistics allowed to take into account exactly the non-equidistant structure of the magnetic atom energy spectrum and to simplify substantially the application of the Wick theorem for construction of the nonequilibrium diagram technique for Hubbard operators. The calculation of the current-voltage characteristics of the magnetic adatom in the tunnel regime at low temperatures revealed the presence of regions with a negative differential conductance induced by magnetic field.

PACS: 73.43.Jn Tunneling;
PACS: 73.63.–b Electronic transport in nanoscale materials and structures.

Key words: Keldysh technique, atomic representation, negative differential conductance.

Published online: December 22, 2014

Download 3343655 byte View Contents