Magnetotransport in Aharonov-Bohm interferometers: Exact numerical simulations

No Thumbnail Available
File version
Author(s)
Bedkihal, Salil
Segal, Dvira
Griffith University Author(s)
Primary Supervisor
Other Supervisors
Editor(s)
Date
2014
Size
File type(s)
Location
License
Abstract

The linear conductance of a two-terminal Aharonov-Bohm interferometer is an even function of the applied magnetic flux, as dictated by the Onsager-Casimir symmetry. Away from linear response this symmetry may be broken when many-body interactions are in effect. Using a numerically exact simulation tool, we study the dynamics and the steady-state behavior of the out-of-equilibrium double-dot Aharonov-Bohm interferometer, while considering different types of interactions: Model I includes a closed interferometer with an interdot electron-electron repulsion energy. In model II the interferometer is interacting with a dissipative environment, possibly driven away from equilibrium. In both cases we show that depending on the (horizontal, vertical) mirror symmetries of the setup, nonlinear transport coefficients obey certain magnetosymmetries. We compare numerically exact simulations to phenomenological approaches and special limits: The behavior of model I is compared to self-consistent mean-field calculations and master equation results in the Coulomb blockade regime. Model II, allowing heat dissipation to a thermal bath, is mimicked by an Aharonov-Bohm junction with a voltage probe. In both cases we find that phenomenological treatments capture the relevant transport symmetries, yet significant deviations in magnitude may show up.

Journal Title

Physical Review B - Condensed Matter and Materials Physics

Conference Title
Book Title
Edition
Volume

90

Issue

23

Thesis Type
Degree Program
School
Publisher link
Patent number
Funder(s)
Grant identifier(s)
Rights Statement
Rights Statement
Item Access Status
Note
Access the data
Related item(s)
Subject

Quantum Physics not elsewhere classified

Physical Sciences

Chemical Sciences

Engineering

Persistent link to this record
Citation
Collections