Hanbury-Brown and Twiss exchange and non-equilibrium-induced correlations in disordered, four-terminal graphene-ribbon conductor

Abstract We have investigated current-current correlations in a cross-shaped conductor made of graphene. The mean free path of charge carriers is on the order of the ribbon width which leads to a hybrid conductor where there is diffusive transport in the device arms while the central connection regi...

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Autores principales:	Z. B. Tan, T. Elo, A. Puska, J. Sarkar, P. Lähteenmäki, F. Duerr, C. Gould, L. W. Molenkamp, K. E. Nagaev, P. J. Hakonen
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2018
Materias:	Conductive Hybrid Partition Noise Occupation Number Fluctuations Current-current Correlation Device Arm Medicine R Science Q
Acceso en línea:	https://doaj.org/article/b825c62147514fd2be4bd78284e1a174
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spelling	oai:doaj.org-article:b825c62147514fd2be4bd78284e1a1742021-12-02T15:08:15ZHanbury-Brown and Twiss exchange and non-equilibrium-induced correlations in disordered, four-terminal graphene-ribbon conductor10.1038/s41598-018-32777-52045-2322https://doaj.org/article/b825c62147514fd2be4bd78284e1a1742018-10-01T00:00:00Zhttps://doi.org/10.1038/s41598-018-32777-5https://doaj.org/toc/2045-2322Abstract We have investigated current-current correlations in a cross-shaped conductor made of graphene. The mean free path of charge carriers is on the order of the ribbon width which leads to a hybrid conductor where there is diffusive transport in the device arms while the central connection region displays near ballistic transport. Our data on auto and cross correlations deviate from the predictions of Landauer-Büttiker theory, and agreement can be obtained only by taking into account contributions from non-thermal electron distributions at the inlets to the semiballistic center, in which the partition noise becomes strongly modified. The experimental results display distinct Hanbury – Brown and Twiss (HBT) exchange correlations, the strength of which is boosted by the non-equilibrium occupation-number fluctuations internal to this hybrid conductor. Our work demonstrates that variation in electron coherence along atomically-thin, two-dimensional conductors has significant implications on their noise and cross correlation properties.Z. B. TanT. EloA. PuskaJ. SarkarP. LähteenmäkiF. DuerrC. GouldL. W. MolenkampK. E. NagaevP. J. HakonenNature PortfolioarticleConductive HybridPartition NoiseOccupation Number FluctuationsCurrent-current CorrelationDevice ArmMedicineRScienceQENScientific Reports, Vol 8, Iss 1, Pp 1-10 (2018)
institution	DOAJ
collection	DOAJ
language	EN
topic	Conductive Hybrid Partition Noise Occupation Number Fluctuations Current-current Correlation Device Arm Medicine R Science Q
spellingShingle	Conductive Hybrid Partition Noise Occupation Number Fluctuations Current-current Correlation Device Arm Medicine R Science Q Z. B. Tan T. Elo A. Puska J. Sarkar P. Lähteenmäki F. Duerr C. Gould L. W. Molenkamp K. E. Nagaev P. J. Hakonen Hanbury-Brown and Twiss exchange and non-equilibrium-induced correlations in disordered, four-terminal graphene-ribbon conductor
description	Abstract We have investigated current-current correlations in a cross-shaped conductor made of graphene. The mean free path of charge carriers is on the order of the ribbon width which leads to a hybrid conductor where there is diffusive transport in the device arms while the central connection region displays near ballistic transport. Our data on auto and cross correlations deviate from the predictions of Landauer-Büttiker theory, and agreement can be obtained only by taking into account contributions from non-thermal electron distributions at the inlets to the semiballistic center, in which the partition noise becomes strongly modified. The experimental results display distinct Hanbury – Brown and Twiss (HBT) exchange correlations, the strength of which is boosted by the non-equilibrium occupation-number fluctuations internal to this hybrid conductor. Our work demonstrates that variation in electron coherence along atomically-thin, two-dimensional conductors has significant implications on their noise and cross correlation properties.
format	article
author	Z. B. Tan T. Elo A. Puska J. Sarkar P. Lähteenmäki F. Duerr C. Gould L. W. Molenkamp K. E. Nagaev P. J. Hakonen
author_facet	Z. B. Tan T. Elo A. Puska J. Sarkar P. Lähteenmäki F. Duerr C. Gould L. W. Molenkamp K. E. Nagaev P. J. Hakonen
author_sort	Z. B. Tan
title	Hanbury-Brown and Twiss exchange and non-equilibrium-induced correlations in disordered, four-terminal graphene-ribbon conductor
title_short	Hanbury-Brown and Twiss exchange and non-equilibrium-induced correlations in disordered, four-terminal graphene-ribbon conductor
title_full	Hanbury-Brown and Twiss exchange and non-equilibrium-induced correlations in disordered, four-terminal graphene-ribbon conductor
title_fullStr	Hanbury-Brown and Twiss exchange and non-equilibrium-induced correlations in disordered, four-terminal graphene-ribbon conductor
title_full_unstemmed	Hanbury-Brown and Twiss exchange and non-equilibrium-induced correlations in disordered, four-terminal graphene-ribbon conductor
title_sort	hanbury-brown and twiss exchange and non-equilibrium-induced correlations in disordered, four-terminal graphene-ribbon conductor
publisher	Nature Portfolio
publishDate	2018
url	https://doaj.org/article/b825c62147514fd2be4bd78284e1a174
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Hanbury-Brown and Twiss exchange and non-equilibrium-induced correlations in disordered, four-terminal graphene-ribbon conductor

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