• 文献标题:   Massive and massless charge carriers in an epitaxially strained alkali metal quantum well on graphene
  • 文献类型:   Article
  • 作  者:   HELL M, EHLEN N, MARINI G, FALKE Y, SENKOVSKIY BV, HERBIG C, TEICHERT C, JOLIE W, MICHELY T, AVILA J, DI SANTO G, DE LA TORRE DM, PETACCIA L, PROFETA G, GRUNEIS A
  • 作者关键词:  
  • 出版物名称:   NATURE COMMUNICATIONS
  • ISSN:   2041-1723
  • 通讯作者地址:   Univ Cologne
  • 被引频次:   0
  • DOI:   10.1038/s41467-020-15130-1
  • 出版年:   2020

▎ 摘  要

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.