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Title: Partial charge transfer and absence of induced magnetization in EuS(111)/Bi2Se3 heterostructures

Journal Article · · Physical Review. B
ORCiD logo [1];  [2];  [3];  [2]
  1. Louisiana State Univ., Baton Rouge, LA (United States); OSTI
  2. Louisiana State Univ., Baton Rouge, LA (United States)
  3. Rensselaer Polytechnic Inst., Troy, NY (United States)

We report that heterostructures made from topological and magnetic insulators promise to form excellent platforms for new electronic and spintronic functionalities mediated by interfacial effects. We report the results of a first-principles density functional theory study of the geometric, electronic structure, and magnetic properties of the EuS( 111 )/Bi2Se3 interface, including van der Waals and relativistic spin-orbit effects. In contrast to previous theoretical studies, we find no appreciable magnetic anisotropy in such a heterostructure. We also do not see additional induced magnetization at the interface or the magnetic proximity effect on the topological states. This is due to the localized nature of Eu moments and because of a partial charge transfer of ~ 0.5 electron from Eu to Se. The formation of the surface dipole shifts the Dirac cone about 0.4 eV below the chemical potential, and the associated electrostatic screening moves the topological state from the first to the second quintuple layer of Bi2Se3 .

Research Organization:
Louisiana State Univ., Baton Rouge, LA (United States); Rensselaer Polytechnic Inst., Troy, NY (United States)
Sponsoring Organization:
Louisiana Board of Regents; National Science Foundation (NSF); USDOE Office of Science (SC)
Grant/Contract Number:
SC0012432
OSTI ID:
1851621
Journal Information:
Physical Review. B, Journal Name: Physical Review. B Journal Issue: 7 Vol. 104; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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