中国物理B ›› 2026, Vol. 35 ›› Issue (5): 56301-056301.doi: 10.1088/1674-1056/ae4b2e

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Ultrafast photocarrier dynamics of black phosphorus under pressure

Hanyu Wang(王瀚宇)1,2,†, Shujuan Xu(许淑娟)1,2,†, Xinyao Wang(汪心瑶)1,2, Kai Zhang (张凯)3, Liangjiang Zou(邹良剑)1, and Fuhai Su(苏付海)1,‡   

  1. 1 Key Laboratory of Materials Physics, Institute of Solid State Physics, HFIPS, Chinese Academy of Sciences, Hefei 230031, China;
    2 University of Science and Technology of China, Hefei 230026, China;
    3 GBA Branch of Aerospace Information Research Institute, Chinese Academy of Sciences, Guangzhou 510700, China
  • 收稿日期:2026-01-19 修回日期:2026-02-12 出版日期:2026-02-27 发布日期:2026-02-27
  • 通讯作者: Fuhai Su E-mail:fhsu@issp.ac.cn
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 12174398 and 12574466).

Ultrafast photocarrier dynamics of black phosphorus under pressure

Hanyu Wang(王瀚宇)1,2,†, Shujuan Xu(许淑娟)1,2,†, Xinyao Wang(汪心瑶)1,2, Kai Zhang (张凯)3, Liangjiang Zou(邹良剑)1, and Fuhai Su(苏付海)1,‡   

  1. 1 Key Laboratory of Materials Physics, Institute of Solid State Physics, HFIPS, Chinese Academy of Sciences, Hefei 230031, China;
    2 University of Science and Technology of China, Hefei 230026, China;
    3 GBA Branch of Aerospace Information Research Institute, Chinese Academy of Sciences, Guangzhou 510700, China
  • Received:2026-01-19 Revised:2026-02-12 Online:2026-02-27 Published:2026-02-27
  • Contact: Fuhai Su E-mail:fhsu@issp.ac.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 12174398 and 12574466).

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摘要： In situ ultrafast photocarrier dynamics of multilayer black phosphorus (BP) are investigated under pressure using optical pump-probe spectroscopy. Below 10 GPa, the transient reflectivity exhibits sub-picosecond saturable absorption (SA) followed by oscillations arising from longitudinal coherent acoustic phonons (CAPs). With increasing pressure, pronounced anomalies in carrier relaxation and CAP behavior are observed, including a strong enhancement of CAP amplitude around 2.0 GPa, associated with a pressure-induced Lifshitz transition. Above 10 GPa the ultrafast response switches from SA to absorption enhancement (AE), accompanied by the complete disappearance of CAPs, indicating the transition to a cubic metallic phase. The pressure-dependent behavior of the CAPs reflects an enhanced interlayer coupling along the cross-plane direction, while the transition from SA to AE dynamics signifies a fundamental shift in in-plane carrier transport. Meanwhile, first-principles calculations reveal a pressure-induced reconstruction of the electronic structure and an increase in the longitudinal acoustic phonon group velocity across Lifshitz transition, supporting the microscopic understanding for anomalous CAP dynamics based on enhanced deformation-potential coupling and electron temperature of Dirac carriers. The study provides critical insights into the pressure-tuned topological transitions and the role of Dirac fermions in the nonequilibrium dynamics of compressed BP.

关键词: black phosphorus, high pressure, ultrafast spectroscopy, Lifshitz transition, coherent acoustic phonons

Abstract: In situ ultrafast photocarrier dynamics of multilayer black phosphorus (BP) are investigated under pressure using optical pump-probe spectroscopy. Below 10 GPa, the transient reflectivity exhibits sub-picosecond saturable absorption (SA) followed by oscillations arising from longitudinal coherent acoustic phonons (CAPs). With increasing pressure, pronounced anomalies in carrier relaxation and CAP behavior are observed, including a strong enhancement of CAP amplitude around 2.0 GPa, associated with a pressure-induced Lifshitz transition. Above 10 GPa the ultrafast response switches from SA to absorption enhancement (AE), accompanied by the complete disappearance of CAPs, indicating the transition to a cubic metallic phase. The pressure-dependent behavior of the CAPs reflects an enhanced interlayer coupling along the cross-plane direction, while the transition from SA to AE dynamics signifies a fundamental shift in in-plane carrier transport. Meanwhile, first-principles calculations reveal a pressure-induced reconstruction of the electronic structure and an increase in the longitudinal acoustic phonon group velocity across Lifshitz transition, supporting the microscopic understanding for anomalous CAP dynamics based on enhanced deformation-potential coupling and electron temperature of Dirac carriers. The study provides critical insights into the pressure-tuned topological transitions and the role of Dirac fermions in the nonequilibrium dynamics of compressed BP.

Key words: black phosphorus, high pressure, ultrafast spectroscopy, Lifshitz transition, coherent acoustic phonons

中图分类号:  (Phonons or vibrational states in low-dimensional structures and nanoscale materials)

  • 63.22.-m
07.35.+k (High-pressure apparatus; shock tubes; diamond anvil cells) 78.47.J- (Ultrafast spectroscopy (<1 psec)) 78.20.-e (Optical properties of bulk materials and thin films) 78.30.Am (Elemental semiconductors and insulators)