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

来源：

SURFACE SCIENCE | 2019年 / 681卷

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

页码：64 / 69

页数：6

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