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Title: Quantum oscillations in a two-dimensional electron gas at the rocksalt/zincblende interface of PbTe/CdTe (111) heterostructures

Quantum oscillations are observed in the 2DEG system at the interface of novel heterostructures, PbTe/CdTe (111), with nearly identical lattice parameters (a PbTe = 0.6462 nm, a CdTe = 0.648 nm) but very different lattice structures (PbTe: rock salt, CdTe: zinc blende). The 2DEG formation mechanism, a mismatch in the bonding configurations of the valence electrons at the interface, is uniquely different from the other known 2DEG systems. The aberration-corrected scanning transmission electron microscope (AC-STEM) characterization indicates an abrupt interface without cation interdiffusion due to a large miscibility gap between the two constituent materials. As a result, electronic transport measurements under magnetic field up to 60 T, with the observation of Landau level filling factor ν = 1, unambiguously reveal a π Berry phase, suggesting the Dirac Fermion nature of the 2DEG at the heterostructure interface, and the PbTe/CdTe heterostructure being a new candidate for 2D topological crystalline insulators.
 [1] ;  [2] ;  [3] ;  [1] ;  [1] ;  [4] ;  [4] ;  [1] ;  [1] ;  [2] ;  [3]
  1. Zhejiang Univ., Zhejiang (China)
  2. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
  3. Univ. of North Carolina at Charlotte, Charlotte, NC (United States)
  4. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Report Number(s):
SAND-2015-7566J; LA-UR-15-24704
Journal ID: ISSN 1530-6984; 603526
Grant/Contract Number:
AC04-94AL85000; AC52-06NA25396
Accepted Manuscript
Journal Name:
Nano Letters
Additional Journal Information:
Journal Volume: 15; Journal Issue: 7; Journal ID: ISSN 1530-6984
American Chemical Society
Research Org:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org:
USDOE National Nuclear Security Administration (NNSA); National Science Foundation (NSF)
Country of Publication:
United States
77 NANOSCIENCE AND NANOTECHNOLOGY; PbTe/CdTe (111); 2DEG; quantum oscillations; Berry phase; topological insulator; 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; 36 MATERIALS SCIENCE; high magnetic field science
OSTI Identifier:
Alternate Identifier(s):
OSTI ID: 1321762