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

Zhang, Bingpo; Lu, Ping; Liu, Henan; Jiao, Lin; Ye, Zhenyu; Jaime, M.; Balakirev, F. F.; Yuan, Huiqiu; Wu, Huizhen; Pan, Wei; Zhang, Yong

doi:10.1021/acs.nanolett.5b01605

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

Journal Article · Fri Jun 05 00:00:00 EDT 2015 · Nano Letters

DOI:https://doi.org/10.1021/acs.nanolett.5b01605· OSTI ID:1235338

Zhang, Bingpo ^[1]; Lu, Ping ^[2]; Liu, Henan ^[3]; Jiao, Lin ^[1]; Ye, Zhenyu ^[1]; Jaime, M. ^[4]; Balakirev, F. F. ^[4]; Yuan, Huiqiu ^[1]; Wu, Huizhen ^[1]; Pan, Wei ^[2]; Zhang, Yong ^[3]

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)

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.

View Accepted Manuscript (DOE)

Research Organization:: Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)

Sponsoring Organization:: NSF; USDOE; USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC04-94AL85000; AC52-06NA25396

OSTI ID:: 1235338

Alternate ID(s):: OSTI ID: 1321762

Report Number(s):: LA-UR--15-24704; SAND--2015-7566J; 603526

Journal Information:: Nano Letters, Journal Name: Nano Letters Journal Issue: 7 Vol. 15; ISSN 1530-6984

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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2DEG
36 MATERIALS SCIENCE
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Berry phase
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Quantum oscillations in a two-dimensional electron gas at the rocksalt/zincblende interface of PbTe/CdTe (111) heterostructures

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