Quantum interference effects in a system of two tunnel point-contacts in the presence of a single scatterer: simulation of a double-tip STM experiment

被引：7

作者：

Khotkevych, N. V. ^{[1
]}

Kolesnichenko, Yu. A. ^{[1
]}

van Ruitenbeek, J. M. ^{[2
]}

机构：

[1] Natl Acad Sci Ukraine, B Verkin Inst Low Temp Phys & Engn, UA-61103 Kharkov, Ukraine

[2] Leiden Univ, Kamerlingh Onnes Lab, NL-2300 Leiden, Netherlands

来源：

LOW TEMPERATURE PHYSICS | 2011年 / 37卷 / 01期

关键词：

MICROSCOPE; CONDUCTANCE;

D O I：

10.1063/1.3551531

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The conductance of systems containing two tunnel point-contacts and a single subsurface scatterer is investigated theoretically. The problem is solved in the approximation of s-wave scattering giving analytical expressions for the wave functions and for the conductance of the system. Conductance oscillations resulting from the interference of electron waves passing through different contacts and their interference with the waves scattered by the defect are analyzed. The possibility of determining the depth of an impurity below the metal surface by using the dependence of the conductance on the distance between the contacts is discussed. It is shown that the application of an external magnetic field results in Aharonov-Bohm oscillations in the conductance, the period of which can be used to determine the depth of the defect in a double-tip STM experiment. (C) 2011 American Institute of Physics. [doi:10.1063/1.3551531]

引用

页码：53 / 58

页数：6