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Quantum Transport and Band Structure Evolution under High Magnetic Field in Few-Layer Tellurene
journal contribution
posted on 2018-08-21, 00:00 authored by Gang Qiu, Yixiu Wang, Yifan Nie, Yongping Zheng, Kyeongjae Cho, Wenzhuo Wu, Peide D. YeQuantum
Hall effect (QHE) is a macroscopic manifestation of quantized
states that only occurs in confined two-dimensional electron gas (2DEG)
systems. Experimentally, QHE is hosted in high-mobility 2DEG with
large external magnetic field at low temperature. Two-dimensional
van der Waals materials, such as graphene and black phosphorus, are
considered interesting material systems to study quantum transport
because they could unveil unique host material properties due to the
easy accessibility of monolayer or few-layer thin films at the 2D
quantum limit. For the first time, we report direct observation of
QHE in a novel low-dimensional material system, tellurene. High-quality
2D tellurene thin films were acquired from recently reported hydrothermal
method with high hole mobility of nearly 3000 cm2/(V s)
at low temperatures, which allows the observation of well-developed
Shubnikov–de Haas (SdH) oscillations and QHE. A four-fold degeneracy
of Landau levels in SdH oscillations and QHE was revealed. Quantum
oscillations were investigated under different gate biases, tilted
magnetic fields, and various temperatures, and the results manifest
the inherent information on the electronic structure of Te. Anomalies
in both temperature-dependent oscillation amplitudes and transport
characteristics were observed that are ascribed to the interplay between
the Zeeman effect and spin–orbit coupling, as depicted by the
density functional theory calculations.
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Two-dimensional van der Waals materialsmaterial systemsquantized statesSdH oscillationstransport characteristicsHigh-quality 2 D tellurenequantum Transportmacroscopic manifestationFew-Layer Tellurene Quantum Hall effecttemperature-dependent oscillation amplitudesquantum oscillationsgate biasesstudy quantum transportQHE2 D quantum limithole mobilitynovel low-dimensional material systemLandau levelshydrothermal methodBand Structure Evolutiontheory calculationsZeeman effectfilmhigh-mobility 2 DEGhost material properties
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