Exciton-exciton annihilation in MoSe2 monolayers

被引：326

作者：

Kumar, Nardeep ^{[1
]}

Cui, Qiannan ^{[1
]}

Ceballos, Frank ^{[1
]}

He, Dawei ^{[2
]}

Wang, Yongsheng ^{[2
]}

Zhao, Hui ^{[1
]}

机构：

[1] Univ Kansas, Dept Phys & Astron, Lawrence, KS 66045 USA

[2] Beijing Jiaotong Univ, Inst Optoelect Technol, Minist Educ, Key Lab Luminescence & Opt Informat, Beijing 100044, Peoples R China

来源：

PHYSICAL REVIEW B | 2014年 / 89卷 / 12期

基金：

美国国家科学基金会;

关键词：

VALLEY POLARIZATION; INTEGRATED-CIRCUITS; COHERENCE;

D O I：

10.1103/PhysRevB.89.125427

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We investigate the excitonic dynamics in MoSe2 monolayer and bulk samples by femtosecond transient absorption. Excitons are resonantly injected by a 750-nm and 100-fs laser pulse, and are detected by measuring a differential reflection of a probe pulse tuned in the range 790-820 nm. We observe a strong density-dependent initial decay of the exciton population in monolayers, which can be well described by the exciton-exciton annihilation. Such a feature is not observed in a bulk sample under comparable conditions. We also observe the saturated absorption induced by excitons in both monolayers and the bulk in the differential reflection measurements, which indicates their potential applications as saturable absorbers.

引用

页数：6

共 55 条

[1] Atomic-Layer Graphene as a Saturable Absorber for Ultrafast Pulsed Lasers [J].

Bao, Qiaoliang ;

Zhang, Han ;

Wang, Yu ;

Ni, Zhenhua ;

Yan, Yongli ;

Shen, Ze Xiang ;

Loh, Kian Ping ;

Tang, Ding Yuan .

ADVANCED FUNCTIONAL MATERIALS, 2009, 19 (19) :3077-3083

[2] KRAMERS-KRONIG ANALYSIS OF THE REFLECTIVITY SPECTRA OF 2H-MOS2, 2H-MOSE2 AND 2H-MOTE2 [J].

BEAL, AR ;

HUGHES, HP .

JOURNAL OF PHYSICS C-SOLID STATE PHYSICS, 1979, 12 (05) :881-890

[3] Visibility of dichalcogenide nanolayers [J].

Benameur, M. M. ;

Radisavljevic, B. ;

Heron, J. S. ;

Sahoo, S. ;

Berger, H. ;

Kis, A. .

NANOTECHNOLOGY, 2011, 22 (12)

[4] Electronic confinement and coherence in patterned epitaxial graphene [J].

Berger, Claire ;

Song, Zhimin ;

Li, Xuebin ;

Wu, Xiaosong ;

Brown, Nate ;

Naud, Cecile ;

Mayou, Didier ;

Li, Tianbo ;

Hass, Joanna ;

Marchenkov, Atexei N. ;

Conrad, Edward H. ;

First, Phillip N. ;

de Heer, Wait A. .

SCIENCE, 2006, 312 (5777) :1191-1196

[5]

Boyd RW, 2008, NONLINEAR OPTICS, 3RD EDITION, P1

[6] Progress, Challenges, and Opportunities in Two-Dimensional Materials Beyond Graphene [J].

Butler, Sheneve Z. ;

Hollen, Shawna M. ;

Cao, Linyou ;

Cui, Yi ;

Gupta, Jay A. ;

Gutierrez, Humberto R. ;

Heinz, Tony F. ;

Hong, Seung Sae ;

Huang, Jiaxing ;

Ismach, Ariel F. ;

Johnston-Halperin, Ezekiel ;

Kuno, Masaru ;

Plashnitsa, Vladimir V. ;

Robinson, Richard D. ;

Ruoff, Rodney S. ;

Salahuddin, Sayeef ;

Shan, Jie ;

Shi, Li ;

Spencer, Michael G. ;

Terrones, Mauricio ;

Windl, Wolfgang ;

Goldberger, Joshua E. .

ACS NANO, 2013, 7 (04) :2898-2926

[7] Valley-selective circular dichroism of monolayer molybdenum disulphide [J].

Cao, Ting ;

Wang, Gang ;

Han, Wenpeng ;

Ye, Huiqi ;

Zhu, Chuanrui ;

Shi, Junren ;

Niu, Qian ;

Tan, Pingheng ;

Wang, Enge ;

Liu, Baoli ;

Feng, Ji .

NATURE COMMUNICATIONS, 2012, 3

[8] Optical identification of atomically thin dichalcogenide crystals [J].

Castellanos-Gomez, A. ;

Agrait, N. ;

Rubio-Bollinger, G. .

APPLIED PHYSICS LETTERS, 2010, 96 (21)

[9] New directions in science and technology: two-dimensional crystals [J].

Castro Neto, A. H. ;

Novoselov, K. .

REPORTS ON PROGRESS IN PHYSICS, 2011, 74 (08)

[10] Quasiparticle band structure calculation of monolayer, bilayer, and bulk MoS2 [J].

Cheiwchanchamnangij, Tawinan ;

Lambrecht, Walter R. L. .

PHYSICAL REVIEW B, 2012, 85 (20)

← 1 2 3 4 5 6 →