Conductance through contact barriers of a finite length quantum wire

Content Provider	Semantic Scholar
Author	Lal, Siddhartha Rao, Sumathi Govinda Sen, Diptiman
Copyright Year	2001
Abstract	We use the technique of bosonization to understand a variety of recent experimental results on the conductivity of a quantum wire. The quantum wire is taken to be a finite-length Luttinger liquid connected on two sides to semi-infinite Fermi liquids through contacts. The contacts are modeled as (short) Luttinger liquids bounded by localized one-body potentials. We use effective actions and the renormalization group to study the effects of electronic interactions within the wire, the length of the wire, finite temperature and a magnetic field on the conductivity. We explain the deviations of the conductivity away from 2Ne2/h in wires which are not too short as arising from renormalization effects caused by the repulsive interactions. We also explain the universal conductance corrections observed in different channels at higher temperatures. We study the effects of an external magnetic field on electronic transport through this system and explain why odd and even spin split bands show different renormalizations from the universal conductance values. We discuss the case of resonant transmission and of the possibility of producing a spin-valve which only allows electrons of one value of the spin to go through. We compare our results for the conductance corrections with experimental observations. We also propose an experimental test of our model of the contact regions. PACS number: 72.10.-d, 85.30.Vw, 71.10.Pm, 73.40.Cg
File Format	PDF HTM / HTML
Alternate Webpage(s)	http://repository.ias.ac.in/45563/1/50-auth.pdf
Alternate Webpage(s)	http://arxiv.org/pdf/cond-mat/0104402v1.pdf
Language	English
Access Restriction	Open
Subject Keyword	Bands Conductance (graph) Femtometer Interaction Liquid substance Magnetic Fields Physics and Astronomy Classification Scheme Quantum wire Semiconductor industry
Content Type	Text
Resource Type	Article