Dephasing in the electronic Mach-Zehnder interferometer at filling factor ν=2

Levkivskyi, Ivan; Sukhorukov, Eugene

doi:10.1103/PhysRevB.78.045322

Scientific article

English

Dephasing in the electronic Mach-Zehnder interferometer at filling factor ν=2

Contributors

Levkivskyi, Ivan; Sukhorukov, Eugene

Published in

Physical review. B, Condensed matter and materials physics, vol. 78, no. 4

Publication date

2008

Abstract

We propose a simple physical model which describes dephasing in the electronic Mach-Zehnder interferometer at filling factor ν=2. This model explains very recent experimental results, such as the unusual lobe-type structure in the visibility of Aharonov-Bohm oscillations, phase rigidity, and the asymmetry of the visibility as a function of transparencies of quantum point contacts. According to our model, dephasing in the interferometer originates from strong Coulomb interaction at the edge of two-dimensional electron gas. The long-range character of the interaction leads to a separation of the spectrum of edge excitations on slow and fast mode. These modes are excited by electron tunneling and carry away the phase information. The new energy scale associated with the slow mode determines the temperature dependence of the visibility and the period of its oscillations as a function of voltage bias. Moreover, the variation of the lobe structure from one experiment to another is explained by specific charging effects, which are different in all experiments. We propose to use a strongly asymmetric Mach-Zehnder interferometer with one arm being much shorter than the other for the spectroscopy of quantum Hall edge states.

UNIGE affiliation entities

Faculté des sciences / Section de physique / Département de physique théorique

Citation (ISO format)

LEVKIVSKYI, Ivan, SUKHORUKOV, Eugene. Dephasing in the electronic Mach-Zehnder interferometer at filling factor ν=2. In: Physical review. B, Condensed matter and materials physics, 2008, vol. 78, n° 4. doi: 10.1103/PhysRevB.78.045322

Article (Published version)

Identifiers

PID : unige:36341
DOI : 10.1103/PhysRevB.78.045322

Journal ISSN

1098-0121

659views

832downloads

Creation

05/05/2014 16:37:00

First validation

05/05/2014 16:37:00

Update

14/03/2023 21:11:44

Status update

14/03/2023 21:11:44

Last indexation

30/10/2024 17:07:20

Dephasing in the electronic Mach-Zehnder interferometer at filling factor ν=2

Contributors

Published in

Publication date

Abstract

UNIGE affiliation entities

Citation (ISO format)

Main files (1)

Identifiers

Journal ISSN

Technical informations

Creation

First validation

Update

Status update

Last indexation