Quantum octets in high mobility pentagonal two-dimensional PdSe2

Yuxin Zhang, Haidong Tian, Huaixuan Li, Chiho Yoon, Ryan A. Nelson, Ziling Li, Kenji Watanabe, Takashi Taniguchi, Dmitry Smirnov, Roland K. Kawakami, Joshua E. Goldberger, Fan Zhang and Chun Ning Lau ()
Additional contact information
Yuxin Zhang: The Ohio State University
Haidong Tian: The Ohio State University
Huaixuan Li: The University of Texas at Dallas
Chiho Yoon: The University of Texas at Dallas
Ryan A. Nelson: The Ohio State University
Ziling Li: The Ohio State University
Kenji Watanabe: National Institute for Materials Science, 1-1 Namiki
Takashi Taniguchi: National Institute for Materials Science, 1-1 Namiki
Dmitry Smirnov: National High Magnetic Field Laboratory
Roland K. Kawakami: The Ohio State University
Joshua E. Goldberger: The Ohio State University
Fan Zhang: The University of Texas at Dallas
Chun Ning Lau: The Ohio State University

Nature Communications, 2024, vol. 15, issue 1, 1-7

Abstract: Abstract Two-dimensional (2D) materials have drawn immense interests in scientific and technological communities, owing to their extraordinary properties and their tunability by gating, proximity, strain and external fields. For electronic applications, an ideal 2D material would have high mobility, air stability, sizable band gap, and be compatible with large scale synthesis. Here we demonstrate air stable field effect transistors using atomically thin few-layer PdSe2 sheets that are sandwiched between hexagonal BN (hBN), with large saturation current > 350 μA/μm, and high field effect mobilities of ~ 700 and 10,000 cm2/Vs at 300 K and 2 K, respectively. At low temperatures, magnetotransport studies reveal unique octets in quantum oscillations that persist at all densities, arising from 2-fold spin and 4-fold valley degeneracies, which can be broken by in-plane and out-of-plane magnetic fields toward quantum Hall spin and orbital ferromagnetism.

Date: 2024
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DOI: 10.1038/s41467-024-44972-2

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