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Massive and massless charge carriers in an epitaxially strained alkali metal quantum well on graphene

Author

Listed:
  • Martin Hell

    (II. Physikalisches Institut, Universität zu Köln)

  • Niels Ehlen

    (II. Physikalisches Institut, Universität zu Köln)

  • Giovanni Marini

    (University of L’Aquila)

  • Yannic Falke

    (II. Physikalisches Institut, Universität zu Köln)

  • Boris V. Senkovskiy

    (II. Physikalisches Institut, Universität zu Köln)

  • Charlotte Herbig

    (II. Physikalisches Institut, Universität zu Köln)

  • Christian Teichert

    (II. Physikalisches Institut, Universität zu Köln
    Institute of Physics, Montanuniversität Leoben)

  • Wouter Jolie

    (II. Physikalisches Institut, Universität zu Köln
    Institute for Molecules and Materials, Radboud University)

  • Thomas Michely

    (II. Physikalisches Institut, Universität zu Köln)

  • Jose Avila

    (ANTARES Beamline, Synchrotron SOLEIL & Universite Paris-Saclay, L’ Orme des Merisiers)

  • Giovanni Di Santo

    (Elettra Sincrotrone Trieste)

  • Diego M. de la Torre

    (II. Physikalisches Institut, Universität zu Köln)

  • Luca Petaccia

    (Elettra Sincrotrone Trieste)

  • Gianni Profeta

    (University of L’Aquila)

  • Alexander Grüneis

    (II. Physikalisches Institut, Universität zu Köln)

Abstract

We show that Cs intercalated bilayer graphene acts as a substrate for the growth of a strained Cs film hosting quantum well states with high electronic quality. The Cs film grows in an fcc phase with a substantially reduced lattice constant of 4.9 Å corresponding to a compressive strain of 11% compared to bulk Cs. We investigate its electronic structure using angle-resolved photoemission spectroscopy and show the coexistence of massless Dirac and massive Schrödinger charge carriers in two dimensions. Analysis of the electronic self-energy of the massive charge carriers reveals the crystallographic direction in which a two-dimensional Fermi gas is realized. Our work introduces the growth of strained metal quantum wells on intercalated Dirac matter.

Suggested Citation

  • Martin Hell & Niels Ehlen & Giovanni Marini & Yannic Falke & Boris V. Senkovskiy & Charlotte Herbig & Christian Teichert & Wouter Jolie & Thomas Michely & Jose Avila & Giovanni Di Santo & Diego M. de , 2020. "Massive and massless charge carriers in an epitaxially strained alkali metal quantum well on graphene," Nature Communications, Nature, vol. 11(1), pages 1-11, December.
    • Handle: RePEc:nat:natcom:v:11:y:2020:i:1:d:10.1038_s41467-020-15130-1
    DOI: 10.1038/s41467-020-15130-1
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