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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Nature Portfolio
2018-10-01
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| Series: | Scientific Reports |
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| Online Access: | https://doi.org/10.1038/s41598-018-32777-5 |
| _version_ | 1819200120898453504 |
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| 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 |
| collection | DOAJ |
| 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. |
| first_indexed | 2024-12-23T03:27:11Z |
| format | Article |
| id | doaj.art-b825c62147514fd2be4bd78284e1a174 |
| institution | Directory Open Access Journal |
| issn | 2045-2322 |
| language | English |
| last_indexed | 2024-12-23T03:27:11Z |
| publishDate | 2018-10-01 |
| publisher | Nature Portfolio |
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| spelling | doaj.art-b825c62147514fd2be4bd78284e1a1742022-12-21T18:01:49ZengNature PortfolioScientific Reports2045-23222018-10-018111010.1038/s41598-018-32777-5Hanbury-Brown and Twiss exchange and non-equilibrium-induced correlations in disordered, four-terminal graphene-ribbon conductorZ. B. Tan0T. Elo1A. Puska2J. Sarkar3P. Lähteenmäki4F. Duerr5C. Gould6L. W. Molenkamp7K. E. Nagaev8P. J. Hakonen9Low Temperature Laboratory, Department of Applied Physics, Aalto UniversityLow Temperature Laboratory, Department of Applied Physics, Aalto UniversityLow Temperature Laboratory, Department of Applied Physics, Aalto UniversityLow Temperature Laboratory, Department of Applied Physics, Aalto UniversityLow Temperature Laboratory, Department of Applied Physics, Aalto UniversityPhysikalisches Institut (EP3), University of WürzburgPhysikalisches Institut (EP3), University of WürzburgPhysikalisches Institut (EP3), University of WürzburgKotelnikov Institute of Radioengineering and Electronics, Russian Academy of ScienceLow Temperature Laboratory, Department of Applied Physics, Aalto UniversityAbstract 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.https://doi.org/10.1038/s41598-018-32777-5Conductive HybridPartition NoiseOccupation Number FluctuationsCurrent-current CorrelationDevice Arm |
| spellingShingle | 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 Scientific Reports Conductive Hybrid Partition Noise Occupation Number Fluctuations Current-current Correlation Device Arm |
| title | 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_short | 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 |
| topic | Conductive Hybrid Partition Noise Occupation Number Fluctuations Current-current Correlation Device Arm |
| url | https://doi.org/10.1038/s41598-018-32777-5 |
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