Probing photocarrier dynamics of pressurized graphene using time-resolved terahertz spectroscopy

doi:10.1088/1674-1056/acc2b1

中国物理B ›› 2023, Vol. 32 ›› Issue (6): 67802-067802.doi: 10.1088/1674-1056/acc2b1

Probing photocarrier dynamics of pressurized graphene using time-resolved terahertz spectroscopy

Yunfeng Wang(王云峰)^1,2, Shujuan Xu(许淑娟)¹, Jin Yang(杨金)¹, and Fuhai Su(苏付海)^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(USTC), Hefei 230026, China

收稿日期:2023-01-28 修回日期:2023-02-25 接受日期:2023-03-09 出版日期:2023-05-17 发布日期:2023-06-07
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, 12004387, 51727806, 51672279, 11874361, and 12204484), the Innovation Program of Chinese Academy of Sciences (Grant No. CXJJ-19-B08), the Youth Innovation Promotion Association of Chinese Academy of Sciences (Grant No. 2021446), the HFIPS Director’s Fund of Chinese Academy of Sciences (Grant Nos. 2021YZGH03 and YZJJKX202202), and China Postdoctoral Science Foundation (Grant No. 2021M703255).

Probing photocarrier dynamics of pressurized graphene using time-resolved terahertz spectroscopy

Yunfeng Wang(王云峰)^1,2, Shujuan Xu(许淑娟)¹, Jin Yang(杨金)¹, and Fuhai Su(苏付海)^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(USTC), Hefei 230026, China

Received:2023-01-28 Revised:2023-02-25 Accepted:2023-03-09 Online:2023-05-17 Published:2023-06-07
Contact: Fuhai Su E-mail:fhsu@issp.ac.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Grant Nos. 12174398, 12004387, 51727806, 51672279, 11874361, and 12204484), the Innovation Program of Chinese Academy of Sciences (Grant No. CXJJ-19-B08), the Youth Innovation Promotion Association of Chinese Academy of Sciences (Grant No. 2021446), the HFIPS Director’s Fund of Chinese Academy of Sciences (Grant Nos. 2021YZGH03 and YZJJKX202202), and China Postdoctoral Science Foundation (Grant No. 2021M703255).

摘要/Abstract

摘要： Graphene hosts intriguing photocarrier dynamics such as negative transient terahertz (THz) photoconductivity, high electron temperature, benefiting from the unique linear Dirac dispersion. In this work, the pressure effects of photocarrier dynamics of graphene have been investigated using in situ time-resolved THz spectroscopy in combination with diamond anvil cell exceeding 9 GPa. We find that the negative THz conductivity maintains in our studied pressure range both for monolayer and bilayer graphene. In particular, the amplitude of THz photoconductivity in monolayer graphene manifests an extraordinary dropping with pressure, compared with that from the counterparts such as bulk silicon and bilayer graphene. Concomitantly, the time constant is reduced with increasing pressure, highlighting the pressure-induced hot carrier cooling. The pressure dependence of photocarrier dynamics in monolayer graphene is likely related with the enhancement of the interfacial coupling between diamond surface and sample, allowing for the activity of new electron-phonon scattering. Our work is expected to provide an impetus for the studies of high-pressure THz spectroscopy of two-dimensional materials.

关键词: terahertz, photocarrier dynamics, graphene, high pressure

Abstract: Graphene hosts intriguing photocarrier dynamics such as negative transient terahertz (THz) photoconductivity, high electron temperature, benefiting from the unique linear Dirac dispersion. In this work, the pressure effects of photocarrier dynamics of graphene have been investigated using in situ time-resolved THz spectroscopy in combination with diamond anvil cell exceeding 9 GPa. We find that the negative THz conductivity maintains in our studied pressure range both for monolayer and bilayer graphene. In particular, the amplitude of THz photoconductivity in monolayer graphene manifests an extraordinary dropping with pressure, compared with that from the counterparts such as bulk silicon and bilayer graphene. Concomitantly, the time constant is reduced with increasing pressure, highlighting the pressure-induced hot carrier cooling. The pressure dependence of photocarrier dynamics in monolayer graphene is likely related with the enhancement of the interfacial coupling between diamond surface and sample, allowing for the activity of new electron-phonon scattering. Our work is expected to provide an impetus for the studies of high-pressure THz spectroscopy of two-dimensional materials.

Key words: terahertz, photocarrier dynamics, graphene, high pressure

中图分类号: (Optical properties of bulk materials and thin films)

78.20.-e

78.47.J- (Ultrafast spectroscopy (<1 psec)) 68.65.Pq (Graphene films) 07.35.+k (High-pressure apparatus; shock tubes; diamond anvil cells)

Yunfeng Wang(王云峰), Shujuan Xu(许淑娟), Jin Yang(杨金), and Fuhai Su(苏付海). Probing photocarrier dynamics of pressurized graphene using time-resolved terahertz spectroscopy[J]. 中国物理B, 2023, 32(6): 67802-067802.

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Probing photocarrier dynamics of pressurized graphene using time-resolved terahertz spectroscopy

Probing photocarrier dynamics of pressurized graphene using time-resolved terahertz spectroscopy

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