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arXiv · 1712.00824

Dephasing in Mach-Zehnder interferometer by an Ohmic contact

Edvin G. Idrisov·Ivan P. Levkivskyi·Eugene V. Sukhorukov
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Abstract

We study dephasing in an electronic Mach-Zehnder (MZ) interferometer based on quantum Hall (QH) edge states by a micromiter-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 an MZ interfeoremter by a quantum point contact (QPC) 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, $Δμ\gg E_C$, the visibility decays in a power-law manner.

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Edvin G. Idrisov, Ivan P. Levkivskyi, Eugene V. Sukhorukov. 2017-12-03. Dephasing in Mach-Zehnder interferometer by an Ohmic contact. https://doi.org/10.1103/physrevlett.121.026802

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