Dephasing in a Mach-Zehnder Interferometer by an Ohmic Contact

We study dephasing in an electronic Mach-Zehnder (MZ) interferometer based on quantum Hall edge states by a micrometer-sized Ohmic contact embedded in one of its arms. We find that at the filling factor ν=1, as well as in the case where an Ohmic contact is connected to a MZ interferometer by a quant...

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Bibliographic Details
Published inPhysical review letters Vol. 121; no. 2; p. 026802
Main Authors Idrisov, Edvin G, Levkivskyi, Ivan P, Sukhorukov, Eugene V
Format Journal Article
LanguageEnglish
Published United States 13.07.2018
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Summary:We study dephasing in an electronic Mach-Zehnder (MZ) interferometer based on quantum Hall edge states by a micrometer-sized Ohmic contact embedded in one of its arms. We find that at the filling factor ν=1, as well as in the case where an Ohmic contact is connected to a MZ interferometer by a quantum point contact that transmits only one electron channel, the phase coherence may not be fully suppressed. Namely, if the voltage bias Δμ and the temperature T are small compared to the charging energy of the Ohmic contact E_{C}, the free fermion picture is manifested, and the visibility saturates at its maximum value. At large biases, Δμ≫E_{C}, the visibility decays in a power-law manner.
ISSN:1079-7114
DOI:10.1103/PhysRevLett.121.026802