Massive and massless charge carriers in an epitaxially strained alkali metal quantum well on graphene.
Journal
Nature communications
ISSN: 2041-1723
Titre abrégé: Nat Commun
Pays: England
ID NLM: 101528555
Informations de publication
Date de publication:
12 Mar 2020
12 Mar 2020
Historique:
received:
02
08
2019
accepted:
21
02
2020
entrez:
14
3
2020
pubmed:
14
3
2020
medline:
14
3
2020
Statut:
epublish
Résumé
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.
Identifiants
pubmed: 32165617
doi: 10.1038/s41467-020-15130-1
pii: 10.1038/s41467-020-15130-1
pmc: PMC7067783
doi:
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
1340Références
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