Electron-phonon coupling in single-layer MoS2

被引:7
|
作者
Mahatha, Sanjoy K. [1 ,2 ]
Ngankeu, Arlette S. [1 ]
Hinsche, Nicki Frank [3 ,4 ]
Mertig, Ingrid [4 ,5 ]
Guilloy, Kevin [1 ]
Matzen, Peter L. [1 ]
Bianchi, Marco [1 ]
Sanders, Charlotte E. [6 ]
Miwa, Jill A. [1 ]
Bana, Harsh [7 ]
Travaglia, Elisabetta [7 ]
Lacovig, Paolo [8 ]
Bignardi, Luca [8 ]
Lizzit, Daniel [8 ]
Larciprete, Rosanna [9 ]
Baraldi, Alessandro [7 ,8 ,10 ]
Lizzit, Silvan [8 ]
Hofmann, Philip [1 ]
机构
[1] Aarhus Univ, Dept Phys & Astron, Interdisciplinary Nanosci Ctr iNANO, DK-8000 Aarhus C, Denmark
[2] Deutsch Elektronen Synchrotron DESY, Hamburg, Germany
[3] Tech Univ Denmark, Dept Phys, Ctr Atom Scale Mat Design, DK-2800 Lyngby, Denmark
[4] Martin Luther Univ Halle Wittenberg, Dept Phys, D-06099 Halle, Germany
[5] Max Planck Inst Microstruct Phys, D-06120 Halle, Germany
[6] STFC Rutherford Appleton Lab, Cent Laser Facil, Didcot OX11 0QX, Oxon, England
[7] Univ Trieste, Dept Phys, Via Valerio 2, I-34127 Trieste, Italy
[8] Elettra Sincrotrone Trieste SCpA, AREA Sci Pk,SS 14 Km 163-5, I-34149 Trieste, Italy
[9] CNR, Inst Complex Syst, Via Fosso del Cavaliere 100, I-00133 Rome, Italy
[10] CNR, IOM, Lab TASC, AREA Sci Pk,SS 14 Km 163-5, I-34149 Trieste, Italy
基金
新加坡国家研究基金会; 欧盟地平线“2020”;
关键词
Transition metal dichalcogenides; Electron-phonon coupling; Angle-resolved photoemission spectroscopy; Density functional theory; MONOLAYER; SPIN; BAND;
D O I
10.1016/j.susc.2018.11.012
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The electron-phonon coupling strength in the spin-split valence band maximum of single-layer MoS2 is studied using angle-resolved photoemission spectroscopy and density functional theory-based calculations. Values of the electron-phonon coupling parameter lambda are obtained by measuring the linewidth of the spin-split bands as a function of temperature and fitting the data points using a Debye model. The experimental values of lambda for the upper and lower spin-split bands at K are found to be 0.05 and 0.32, respectively, in excellent agreement with the calculated values for a free-standing single-layer MoS2. The results are discussed in the context of spin and phase-space restricted scattering channels, as reported earlier for single-layer WS2 on Au(111). The fact that the absolute valence band maximum in single-layer MoS2 at K is almost degenerate with the local valence band maximum at Gamma can potentially be used to tune the strength of the electron-phonon interaction in this material.
引用
收藏
页码:64 / 69
页数:6
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