title: Quantum Oscillations in a Two-Dimensional Electron Gas at the Rocksalt/Zincblende Interface of PbTe/CdTe (111) Heterostructures.
abstract: 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. 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.
authors.affiliation: †Department of Physics, State Key Laboratory for Silicon Materials, and Center for Correlated Matter, Zhejiang University, Hangzhou, Zhejiang, 310027, People's Republic of China.
authors.forename: Bingpo
authors.initials: B
authors.lastname: Zhang
authors.affiliation: ‡Sandia National Laboratories, Albuquerque, New Mexico 87185, United States.
authors.forename: Ping
authors.initials: P
authors.lastname: Lu
authors.affiliation: §Department of Electrical Engineering, Optoelectronics Center, University of North Carolina at Charlotte, Charlotte, North Carolina 28223, United States.
authors.forename: Henan
authors.initials: H
authors.lastname: Liu
authors.affiliation: †Department of Physics, State Key Laboratory for Silicon Materials, and Center for Correlated Matter, Zhejiang University, Hangzhou, Zhejiang, 310027, People's Republic of China.
authors.forename: Lin
authors.initials: L
authors.lastname: Jiao
authors.affiliation: †Department of Physics, State Key Laboratory for Silicon Materials, and Center for Correlated Matter, Zhejiang University, Hangzhou, Zhejiang, 310027, People's Republic of China.
authors.forename: Zhenyu
authors.initials: Z
authors.lastname: Ye
authors.affiliation: ∥NHMFL, Los Alamos National Lab, Los Alamos, New Mexico 87545, United States.
authors.forename: M
authors.initials: M
authors.lastname: Jaime
authors.affiliation: ∥NHMFL, Los Alamos National Lab, Los Alamos, New Mexico 87545, United States.
authors.forename: F F
authors.initials: FF
authors.lastname: Balakirev
authors.affiliation: †Department of Physics, State Key Laboratory for Silicon Materials, and Center for Correlated Matter, Zhejiang University, Hangzhou, Zhejiang, 310027, People's Republic of China.
authors.forename: Huiqiu
authors.initials: H
authors.lastname: Yuan
authors.affiliation: †Department of Physics, State Key Laboratory for Silicon Materials, and Center for Correlated Matter, Zhejiang University, Hangzhou, Zhejiang, 310027, People's Republic of China.
authors.forename: Huizhen
authors.initials: H
authors.lastname: Wu
authors.affiliation: ‡Sandia National Laboratories, Albuquerque, New Mexico 87185, United States.
authors.forename: Wei
authors.initials: W
authors.lastname: Pan
authors.affiliation: §Department of Electrical Engineering, Optoelectronics Center, University of North Carolina at Charlotte, Charlotte, North Carolina 28223, United States.
authors.forename: Yong
authors.initials: Y
authors.lastname: Zhang
keywords: 2DEG; Berry phase; PbTe/CdTe (111); quantum oscillations; topological insulator