Minibands in twisted bilayer graphene probed by magnetic focusingCitation formats

  • External authors:
  • Alexey Berdyugin
  • Adrian Ceferino
  • Roshan Krishna Kumar
  • T Taniguchi
  • K Watanabe
  • Andre Geim
  • Vladimir Fal'ko

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Minibands in twisted bilayer graphene probed by magnetic focusing. / Berdyugin, Alexey; Tsim, Bonnie; Kumaravadivel, Piranavan; Xu, Shuigang; Ceferino, Adrian; Knothe, Angelika; Krishna Kumar, Roshan; Taniguchi, T; Watanabe, K; Geim, Andre; Grigorieva, Irina; Fal'ko, Vladimir.

In: Science Advances, 17.04.2020.

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Berdyugin, Alexey ; Tsim, Bonnie ; Kumaravadivel, Piranavan ; Xu, Shuigang ; Ceferino, Adrian ; Knothe, Angelika ; Krishna Kumar, Roshan ; Taniguchi, T ; Watanabe, K ; Geim, Andre ; Grigorieva, Irina ; Fal'ko, Vladimir. / Minibands in twisted bilayer graphene probed by magnetic focusing. In: Science Advances. 2020.

Bibtex

@article{d4fde20f98d44837b2fac4fbbbc13741,
title = "Minibands in twisted bilayer graphene probed by magnetic focusing",
abstract = "Magnetic fields force ballistic electrons injected from a narrow contact to move along skipping orbits and form caustics. This leads to pronounced resistance peaks at nearby voltage probes as electrons are effectively focused inside them, a phenomenon known as magnetic focusing. This can be used not only for the demonstration of ballistic transport but also to study the electronic structure of metals. Here we use magnetic focusing to probe narrow bands in graphene bilayers twisted at 2 degrees. Their minibands are found to support long-range ballistic transport limited at low temperatures by intrinsic electron-electron scattering. A voltage bias between the layers causes strong valley splitting and allows selective focusing for different valleys, which is of interest for using this degree of freedom in frequently-discussed valleytronics.",
keywords = "graphene, twisted bilayer graphene, TBG, ballistic, minibands, magnetic focusing",
author = "Alexey Berdyugin and Bonnie Tsim and Piranavan Kumaravadivel and Shuigang Xu and Adrian Ceferino and Angelika Knothe and {Krishna Kumar}, Roshan and T Taniguchi and K Watanabe and Andre Geim and Irina Grigorieva and Vladimir Fal'ko",
year = "2020",
month = apr,
day = "17",
doi = "10.1126/sciadv.aay7838",
language = "English",
journal = "Science Advances",
issn = "2375-2548",
publisher = "American Association for the Advancement of Science (A A A S)",

}

RIS

TY - JOUR

T1 - Minibands in twisted bilayer graphene probed by magnetic focusing

AU - Berdyugin, Alexey

AU - Tsim, Bonnie

AU - Kumaravadivel, Piranavan

AU - Xu, Shuigang

AU - Ceferino, Adrian

AU - Knothe, Angelika

AU - Krishna Kumar, Roshan

AU - Taniguchi, T

AU - Watanabe, K

AU - Geim, Andre

AU - Grigorieva, Irina

AU - Fal'ko, Vladimir

PY - 2020/4/17

Y1 - 2020/4/17

N2 - Magnetic fields force ballistic electrons injected from a narrow contact to move along skipping orbits and form caustics. This leads to pronounced resistance peaks at nearby voltage probes as electrons are effectively focused inside them, a phenomenon known as magnetic focusing. This can be used not only for the demonstration of ballistic transport but also to study the electronic structure of metals. Here we use magnetic focusing to probe narrow bands in graphene bilayers twisted at 2 degrees. Their minibands are found to support long-range ballistic transport limited at low temperatures by intrinsic electron-electron scattering. A voltage bias between the layers causes strong valley splitting and allows selective focusing for different valleys, which is of interest for using this degree of freedom in frequently-discussed valleytronics.

AB - Magnetic fields force ballistic electrons injected from a narrow contact to move along skipping orbits and form caustics. This leads to pronounced resistance peaks at nearby voltage probes as electrons are effectively focused inside them, a phenomenon known as magnetic focusing. This can be used not only for the demonstration of ballistic transport but also to study the electronic structure of metals. Here we use magnetic focusing to probe narrow bands in graphene bilayers twisted at 2 degrees. Their minibands are found to support long-range ballistic transport limited at low temperatures by intrinsic electron-electron scattering. A voltage bias between the layers causes strong valley splitting and allows selective focusing for different valleys, which is of interest for using this degree of freedom in frequently-discussed valleytronics.

KW - graphene

KW - twisted bilayer graphene

KW - TBG

KW - ballistic

KW - minibands

KW - magnetic focusing

UR - https://arxiv.org/abs/1911.02827

U2 - 10.1126/sciadv.aay7838

DO - 10.1126/sciadv.aay7838

M3 - Article

JO - Science Advances

JF - Science Advances

SN - 2375-2548

ER -