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Research Article

Pressure-driven layer-dependent phase transitions and enhanced interlayer coupling in PdSe2 crystals

Junnan Ding1,2, Xing Xie1,2, Xinyu Ouyang2, Junying Chen1,2, Fangping Ouyang1,3, Zongwen Liu4,5, Jian-Tao Wang6,7,8, Jun He1,2( ), Yanping Liu1,2( )
Institute of Quantum Physics, School of Physics, Central South University, Changsha 410083, China
State Key Laboratory of Precision Manufacturing for Extreme Service Performance, Central South University, Changsha 410083, China
School of Physics and Technology, State Key Laboratory of Chemistry and Utilization of Carbon Based Energy Resources, Xinjiang University, Urumqi 830046, China
School of Chemical and Biomolecular Engineering, The University of Sydney, NSW 2006, Australia
The University of Sydney Nano Institute, The University of Sydney, NSW 2006, Australia
Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
Songshan Lake Materials Laboratory, Dongguan 523808, China
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Graphical Abstract

Our findings offer a comprehensive investigation into the pressure-driven phase transitions and interlayer coupling enhancement in PdSe2 crystals, providing insights into their electronic and structural properties under extreme conditions.

Abstract

Pressure exerts a profound influence on atomic configurations and interlayer interactions, thereby modulating the electronic and structural properties of materials. While high pressure has been observed to induce a structural phase transition in bulk PdSe2 crystals, leading to a transition from semiconductor to metal, the high-pressure behavior of few-layer PdSe2 remains elusive. Here, employing diamond anvil cell (DAC) techniques and high-pressure Raman spectroscopy, we investigate the structural evolution of layer-dependent PdSe2 under high pressure. We reveal that pressure significantly enhances interlayer coupling in PdSe2, driving structural phase transitions from an orthorhombic to a cubic phase. We demonstrate that PdSe2 crystals exhibit distinct layer-dependent pressure thresholds during the phase transition, with the decrease of transition pressure as the thickness of PdSe2 increases. Furthermore, our results of polarized Raman spectra confirm a reduction in material anisotropy with increasing pressure. This study offers crucial insights into the structural evolution of layer-dependent van der Waals materials under pressure, advancing our understanding of their pressure-induced behaviors.

Keywords

palladium diselenidehigh pressurephase transitiondiamond anvil cellanisotropy

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Nano Research
Volume 17 Issue 11,
November 2024
Pages 10170-10178
DOI: 10.1007/s12274-024-6927-4
Cite this article:
Ding J, Xie X, Ouyang X, et al. Pressure-driven layer-dependent phase transitions and enhanced interlayer coupling in PdSe2 crystals. Nano Research, 2024, 17(11): 10170-10178. https://doi.org/10.1007/s12274-024-6927-4
Topics:
Semiconducting films

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Received: 11 June 2024
Revised: 17 July 2024
Accepted: 01 August 2024
Published: 05 September 2024
© Tsinghua University Press 2024
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