Hell, Martin, Ehlen, Niels, Marini, Giovanni, Falke, Yannic, Senkovskiy, Boris, V, Herbig, Charlotte, Teichert, Christian, Jolie, Wouter, Michely, Thomas, Avila, Jose, Di Santo, Giovanni, de la Torre, Diego M., Petaccia, Luca, Profeta, Gianni ORCID: 0000-0002-0535-7573 and Grueneis, Alexander (2020). Massive and massless charge carriers in an epitaxially strained alkali metal quantum well on graphene. Nat. Commun., 11 (1). LONDON: NATURE PUBLISHING GROUP. ISSN 2041-1723

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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 angstrom 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 Schrodinger 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.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Hell, MartinUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Ehlen, NielsUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Marini, GiovanniUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Falke, YannicUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Senkovskiy, Boris, VUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Herbig, CharlotteUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Teichert, ChristianUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Jolie, WouterUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Michely, ThomasUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Avila, JoseUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Di Santo, GiovanniUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
de la Torre, Diego M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Petaccia, LucaUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Profeta, GianniUNSPECIFIEDorcid.org/0000-0002-0535-7573UNSPECIFIED
Grueneis, AlexanderUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
URN: urn:nbn:de:hbz:38-341074
DOI: 10.1038/s41467-020-15130-1
Journal or Publication Title: Nat. Commun.
Volume: 11
Number: 1
Date: 2020
Publisher: NATURE PUBLISHING GROUP
Place of Publication: LONDON
ISSN: 2041-1723
Language: English
Faculty: Unspecified
Divisions: Unspecified
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
DER-WAALS EPITAXY; CRYSTAL-STRUCTURE; SURFACE-ENERGY; MARTENSITIC-TRANSFORMATION; PHASE-TRANSITIONS; PRESSURE; CESIUM; FCC; BCC; INTERCALATIONMultiple languages
Multidisciplinary SciencesMultiple languages
URI: http://kups.ub.uni-koeln.de/id/eprint/34107

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