Hanbury Brown and Twiss exchange correlations in a graphene box

Teemu Elo, Zhenbing Tan, Ciprian Padurariu, Fabian Duerr, Dmitry S. Golubev, Gordey B. Lesovik, and Pertti Hakonen

Phys. Rev. B 100, 235433 – Published 18 December 2019

Abstract

Quadratic detection in linear mesoscopic transport systems produces cross terms that can be viewed as interference signals reflecting statistical properties of charge carriers. In electronic systems these cross-term interferences arise from exchange effects due to Pauli principle. Here we demonstrate fermionic Hanbury Brown and Twiss (HBT) exchange phenomena due to indistinguishability of charge carriers in a diffusive graphene system. These exchange effects are verified using current-current cross-correlations in combination with regular shot noise (autocorrelation) experiments at microwave frequencies. Our results can be modeled using semiclassical analysis for a square-shaped metallic diffusive conductor, including contributions from contact transparency. The experimentally determined HBT exchange factor values lie between the calculated ones for coherent and hot electron transport.

Received 12 September 2019

DOI:https://doi.org/10.1103/PhysRevB.100.235433

Physics Subject Headings (PhySH)

Diffusion Noise Quantum interference effects

Graphene

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Teemu Elo ^1,*, Zhenbing Tan^1,†, Ciprian Padurariu ^1,2, Fabian Duerr³, Dmitry S. Golubev ^1,‡, Gordey B. Lesovik⁴, and Pertti Hakonen ^1,§

¹Low Temperature Laboratory, Department of Applied Physics, Aalto University, Espoo, Finland
²Institute for Complex Quantum Systems and IQST, Ulm University, Ulm, Germany
³Physikalisches Institut (EP3), University of Würzburg, Würzburg, Germany
⁴Moscow Institute of Physics and Technology, Moscow 141700, Russian Federation

^*teemu.elo@aalto.fi
^†Present address: Shenzhen Institute for Quantum Science and Engineering, and Department of Physics, Southern University of Science and Technology, Shenzhen 518055, China.
^‡Present address: QTF Centre of Excellence, Department of Applied Physics, Aalto University, FI-00076 Aalto, Finland.
^§pertti.hakonen@aalto.fi

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Vol. 100, Iss. 23 — 15 December 2019

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