Quantum oscillations in a two-dimensional electron gas at the rocksalt/zincblende interface of PbTe/CdTe (111) heterostructures
- Zhejiang Univ., Zhejiang (China)
- Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
- Univ. of North Carolina at Charlotte, Charlotte, NC (United States)
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Here, quantum oscillations are observed in the 2DEG system at the interface of novel heterostructures, PbTe/CdTe (111), with nearly identical lattice parameters (aPbTe = 0.6462 nm, aCdTe = 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. 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.
- Research Organization:
- Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Sponsoring Organization:
- USDOE National Nuclear Security Administration (NNSA); National Science Foundation (NSF)
- Grant/Contract Number:
- AC04-94AL85000; AC52-06NA25396
- OSTI ID:
- 1235338
- Alternate ID(s):
- OSTI ID: 1321762
- Report Number(s):
- SAND-2015-7566J; LA-UR-15-24704; 603526
- Journal Information:
- Nano Letters, Vol. 15, Issue 7; ISSN 1530-6984
- Publisher:
- American Chemical SocietyCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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journal | April 2019 |
Realization of a New Topological Crystalline Insulator and Lifshitz Transition in PbTe
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journal | July 2018 |
Electric‐Field Control of Dirac Two‐Dimensional Electron Gas in PbTe/CdTe Heterostructures
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journal | January 2019 |
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