journal article·2022-04-29Open access

Dimensional crossover and symmetry transformation of charge density waves in VSe2

P. Chen, Y.-H. Chan, R.-Y. Liu, H. T. Zhang, Q. Gao, A.-V. Fedorov, M. Y. Chou, T.-C. Chiang

Physical Review B· Volume 105· Issue 16

Abstract

Collective phenomena in solids can be sensitive to the dimensionality of the system; a case of special interest is ${\mathrm{VSe}}2$, which shows a $(\sqrt{7}\ifmmode\times\else\texttimes\fi{}\sqrt{3})$ charge density wave (CDW) in the single layer with threefold symmetry in the normal phase spontaneously broken, in contrast to the $(4\ifmmode\times\else\texttimes\fi{}4)$ in-plane CDW in the bulk. Angle-resolved photoemission spectroscopy (ARPES) from ${\mathrm{VSe}}2$ ranging from a single layer to the bulk reveals the evolution of the electronic structure including the Fermi surface contours and the CDW gap. At a thickness of two layers, the ARPES maps are already nearly bulklike, but the transition temperature ${T}_{\mathrm{C}}$ for the $(4\ifmmode\times\else\texttimes\fi{}4)$ CDW is much higher than the bulk value of 110 K. These results can be understood as due to dimensional crossover of phonon instability driven by a competition of nesting vectors. In this letter, we provide key insights into the CDW mechanisms and offer a perspective in the search and control of emergent phases in quantum materials.
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Research context

OpenAlex topics: 2D Materials and Applications · Organic and Molecular Conductors Research · Electronic and Structural Properties of Oxides

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Key Laboratory of Artificial Structures and Quantum Control (Ministry of Education), Shenyang National Laboratory for Materials Science, Shanghai Center for Complex Physics, School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China

Institute of Atomic and Molecular Sciences, Academia Sinica, Taipei 10617, Taiwan

Physics Division, National Center for Theoretical Sciences, Taipei 10617, Taiwan

Department of Physics, University of Illinois at Urbana-Champaign, 1110 West Green Street, Urbana, Illinois 61801-3080, USA

Frederick Seitz Materials Research Laboratory, University of Illinois at Urbana-Champaign, 104 South Goodwin Avenue, Urbana, Illinois 61801-2902, USA

National Synchrotron Radiation Research Center, 101 Hsin-Ann Road, Hsinchu Science Park, Hsinchu 30076, Taiwan

Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA

Department of Physics, National Taiwan University, Taipei 10617, Taiwan

School of Physics, Georgia Institute of Technology, Atlanta, Georgia 30332, USA

Funding

Ministry of Science and Technology of the People's Republic of China · U.S. Department of Energy · National Center for Theoretical Sciences · Academia Sinica

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