Observation of dynamic screening in the excited exciton states in multilayered MoS2

被引：13

作者：

Karmakar, Manobina ^{[1
]}

Bhattacharya, Sayantan ^{[1
,9
]}

Mukherjee, Subhrajit ^{[2
,10
]}

Ghosh, Barun ^{[3
]}

Chowdhury, Rup Kumar ^{[1
]}

Agarwal, Amit ^{[3
]}

Ray, Samit Kumar ^{[1
,4
]}

Chanda, Debashis ^{[5
,6
,7
,8
]}

Datta, Prasanta Kumar ^{[1
]}

机构：

[1] Indian Inst Technol Kharagpur, Dept Phys, Kharagpur 721302, W Bengal, India

[2] Indian Inst Technol Kharagpur, Adv Technol & Dev Ctr, Kharagpur 721302, W Bengal, India

[3] Indian Inst Technol Kanpur, Dept Phys, Kanpur 208016, Uttar Pradesh, India

[4] SN Bose Natl Ctr Basic Sci, Kolkata 700106, India

[5] Univ Cent Florida, Dept Phys, NanoSci Technol Ctr, Orlando, FL 32826 USA

[6] Univ Cent Florida, CREOL, Coll Opt & Photon, Orlando, FL 32826 USA

[7] Univ Cent Florida, CREOL, Coll Opt & Photon, Orlando, FL 32816 USA

[8] Univ Cent Florida, Dept Phys, Orlando, FL 32816 USA

[9] Univ Sheffield, Dept Chem, Sheffield S3 7HF, S Yorkshire, England

[10] Technion Israel Inst Technol, Fac Mat Sci & Engn, IL-3203003 Haifa, Israel

来源：

PHYSICAL REVIEW B | 2021年 / 103卷 / 07期

关键词：

D O I：

10.1103/PhysRevB.103.075437

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Excitonic resonance and binding energies can be altered by controlling the environmental screening of the attractive Coulomb potential. Although this screening response is often assumed to be static, the time evolution of the excitonic quasiparticles manifests a frequency dependence in its Coulomb screening efficacy. In this paper, we investigate a ground (1s) and first excited exciton state (2s) in a multilayered transition metal dichalcogenide (MoS2) upon ultrafast photoexcitation. We explore the dynamic screening effects on the latter and show its resonance frequency is the relevant frequency at which screening from the smaller-sized 1s counterparts is effective. Our finding sheds light on new avenues of external tuning on excitonic properties.

引用

页数：7

共 42 条

[1]

[Anonymous], 2010, INTRO NANOPHOTONICS

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