@article{Ding2024, 
author = {Junnan Ding and Xing Xie and Xinyu Ouyang and Junying Chen and Fangping Ouyang and Zongwen Liu and Jian-Tao Wang and Jun He and Yanping Liu},
title = {Pressure-driven layer-dependent phase transitions and enhanced interlayer coupling in PdSe2 crystals},
year = {2024},
journal = {Nano Research},
volume = {17},
number = {11},
pages = {10170-10178},
keywords = {anisotropy, high pressure, phase transition, diamond anvil cell, palladium diselenide},
url = {https://www.sciopen.com/article/10.1007/s12274-024-6927-4},
doi = {10.1007/s12274-024-6927-4},
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.}
}