A magnetically-induced Coulomb gap in graphene due to electron-electron interactions

E. E. Vdovin; Mark Greenaway; Yu N. Khanin; Sergey Morozov; Oleg Makarovsky; Amalia Patané; Artem Mishchenko; Sergey Slizovskiy; Vladimir Fal'ko; Andre Geim; Kostya S Novoselov; Laurence Eaves

doi:10.1038/s42005-023-01277-y

A magnetically-induced Coulomb gap in graphene due to electron-electron interactions

E. E. Vdovin, Mark Greenaway, Yu N. Khanin, Sergey Morozov, Oleg Makarovsky, Amalia Patané, Artem Mishchenko, Sergey Slizovskiy, Vladimir Fal'ko, Andre Geim, Kostya S Novoselov, Laurence Eaves

Research output: Contribution to journal › Article › peer-review

Abstract

Insights into the fundamental properties of graphene’s Dirac-Weyl fermions have emerged from studies of electron tunnelling transistors in which an atomically thin layer of hexagonal boron nitride (hBN) is sandwiched between two layers of high purity graphene. Here, we show that when a single defect is present within the hBN tunnel barrier, it can inject electrons into the graphene layers and its sharply defined energy level acts as a high resolution spectroscopic probe of electron-electron interactions in graphene. We report a magnetic field dependent suppression of the tunnel current flowing through a single defect below temperatures of ~2 K. This is attributed to the formation of a magnetically-induced Coulomb gap in the spectral density of electrons tunnelling into graphene due to electron-electron interactions.

Original language	English
Article number	159
Journal	Communications physics
Volume	6
Early online date	30 Jun 2023
DOIs	https://doi.org/10.1038/s42005-023-01277-y
Publication status	E-pub ahead of print - 30 Jun 2023

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Vdovin, E. E., Greenaway, M., Khanin, Y. N., Morozov, S., Makarovsky, O., Patané, A., Mishchenko, A., Slizovskiy, S., Fal'ko, V., Geim, A., Novoselov, K. S., & Eaves, L. (2023). A magnetically-induced Coulomb gap in graphene due to electron-electron interactions. Communications physics, 6, Article 159. Advance online publication. https://doi.org/10.1038/s42005-023-01277-y

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AU - Vdovin, E. E.

AU - Greenaway, Mark

AU - Khanin, Yu N.

AU - Morozov, Sergey

AU - Makarovsky, Oleg

AU - Patané, Amalia

AU - Mishchenko, Artem

AU - Slizovskiy, Sergey

AU - Fal'ko, Vladimir

AU - Geim, Andre

AU - Novoselov, Kostya S

AU - Eaves, Laurence

PY - 2023/6/30

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AB - Insights into the fundamental properties of graphene’s Dirac-Weyl fermions have emerged from studies of electron tunnelling transistors in which an atomically thin layer of hexagonal boron nitride (hBN) is sandwiched between two layers of high purity graphene. Here, we show that when a single defect is present within the hBN tunnel barrier, it can inject electrons into the graphene layers and its sharply defined energy level acts as a high resolution spectroscopic probe of electron-electron interactions in graphene. We report a magnetic field dependent suppression of the tunnel current flowing through a single defect below temperatures of ~2 K. This is attributed to the formation of a magnetically-induced Coulomb gap in the spectral density of electrons tunnelling into graphene due to electron-electron interactions.

U2 - 10.1038/s42005-023-01277-y

DO - 10.1038/s42005-023-01277-y

M3 - Article

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JO - Communications physics

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ER -

A magnetically-induced Coulomb gap in graphene due to electron-electron interactions

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