New Pressure Stabilization Structure in Two-Dimensional PtSe2

Kai Jiang; Anyang Cui; Sen Shao; Jiajia Feng; Hongliang Dong; Bin Chen; Yanchao Wang; Zhigao Hu; Junhao Chu

doi:10.1021/acs.jpclett.0c01813

New Pressure Stabilization Structure in Two-Dimensional PtSe₂

Kai Jiang
, Anyang Cui
, Sen Shao
, Jiajia Feng
, Hongliang Dong
, Bin Chen
, Yanchao Wang^*
, Zhigao Hu^*
, Junhao Chu

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

18 Scopus citations

Abstract

The frequency shifts and lattice dynamics to unveil the vibrational properties of platinum diselenide (PtSe2) are investigated using pressure-dependent polarized Raman scattering at room temperature up to 25 GPa. The two phonon modes Eg and A1g display similar hardening trends; both the Raman peak positions and full widths at half-maximum have distinct mutation phenomena under high pressure. Especially, the split Eg mode at 4.3 GPa confirms the change of the lattice symmetry. With the aid of the first-principles calculations, a new pressure stabilization structure C2/m of PtSe2 has been found to be in good agreement with experiments. The band structures calculations reveal that the new phase is a novel type-I Dirac semimetal. The results demonstrate that the pressure-dependent Raman spectra combined with theoretical predictions may open a new window for searching and controlling the phase structure and Dirac cones of two-dimensional materials.

Original language	English
Pages (from-to)	7342-7349
Number of pages	8
Journal	Journal of Physical Chemistry Letters
Volume	11
Issue number	17
DOIs	https://doi.org/10.1021/acs.jpclett.0c01813
State	Published - 3 Sep 2020
Externally published	Yes

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10.1021/acs.jpclett.0c01813

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title = "New Pressure Stabilization Structure in Two-Dimensional PtSe2",

abstract = "The frequency shifts and lattice dynamics to unveil the vibrational properties of platinum diselenide (PtSe2) are investigated using pressure-dependent polarized Raman scattering at room temperature up to 25 GPa. The two phonon modes Eg and A1g display similar hardening trends; both the Raman peak positions and full widths at half-maximum have distinct mutation phenomena under high pressure. Especially, the split Eg mode at 4.3 GPa confirms the change of the lattice symmetry. With the aid of the first-principles calculations, a new pressure stabilization structure C2/m of PtSe2 has been found to be in good agreement with experiments. The band structures calculations reveal that the new phase is a novel type-I Dirac semimetal. The results demonstrate that the pressure-dependent Raman spectra combined with theoretical predictions may open a new window for searching and controlling the phase structure and Dirac cones of two-dimensional materials.",

author = "Kai Jiang and Anyang Cui and Sen Shao and Jiajia Feng and Hongliang Dong and Bin Chen and Yanchao Wang and Zhigao Hu and Junhao Chu",

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day = "3",

doi = "10.1021/acs.jpclett.0c01813",

language = "英语",

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TY - JOUR

T1 - New Pressure Stabilization Structure in Two-Dimensional PtSe2

AU - Jiang, Kai

AU - Cui, Anyang

AU - Shao, Sen

AU - Feng, Jiajia

AU - Dong, Hongliang

AU - Chen, Bin

AU - Wang, Yanchao

AU - Hu, Zhigao

AU - Chu, Junhao

PY - 2020/9/3

Y1 - 2020/9/3

N2 - The frequency shifts and lattice dynamics to unveil the vibrational properties of platinum diselenide (PtSe2) are investigated using pressure-dependent polarized Raman scattering at room temperature up to 25 GPa. The two phonon modes Eg and A1g display similar hardening trends; both the Raman peak positions and full widths at half-maximum have distinct mutation phenomena under high pressure. Especially, the split Eg mode at 4.3 GPa confirms the change of the lattice symmetry. With the aid of the first-principles calculations, a new pressure stabilization structure C2/m of PtSe2 has been found to be in good agreement with experiments. The band structures calculations reveal that the new phase is a novel type-I Dirac semimetal. The results demonstrate that the pressure-dependent Raman spectra combined with theoretical predictions may open a new window for searching and controlling the phase structure and Dirac cones of two-dimensional materials.

AB - The frequency shifts and lattice dynamics to unveil the vibrational properties of platinum diselenide (PtSe2) are investigated using pressure-dependent polarized Raman scattering at room temperature up to 25 GPa. The two phonon modes Eg and A1g display similar hardening trends; both the Raman peak positions and full widths at half-maximum have distinct mutation phenomena under high pressure. Especially, the split Eg mode at 4.3 GPa confirms the change of the lattice symmetry. With the aid of the first-principles calculations, a new pressure stabilization structure C2/m of PtSe2 has been found to be in good agreement with experiments. The band structures calculations reveal that the new phase is a novel type-I Dirac semimetal. The results demonstrate that the pressure-dependent Raman spectra combined with theoretical predictions may open a new window for searching and controlling the phase structure and Dirac cones of two-dimensional materials.

UR - https://www.scopus.com/pages/publications/85090276749

U2 - 10.1021/acs.jpclett.0c01813

DO - 10.1021/acs.jpclett.0c01813

M3 - 文章

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AN - SCOPUS:85090276749

SN - 1948-7185

VL - 11

SP - 7342

EP - 7349

JO - Journal of Physical Chemistry Letters

JF - Journal of Physical Chemistry Letters

IS - 17

ER -

New Pressure Stabilization Structure in Two-Dimensional PtSe₂

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