Local spectroscopic characterization of spin and layer polarization in WSe2

Matthew Yankowitz, Devin McKenzie, Brian J Leroy

Research output: Contribution to journalArticle

27 Citations (Scopus)

Abstract

We report scanning tunneling microscopy and scanning tunneling spectroscopy (STS) measurements of monolayer and bilayer WSe2. We measure a band gap of 2.21±0.08eV in monolayer WSe2, which is much larger than the energy of the photoluminescence peak, indicating a large excitonic binding energy. We additionally observe significant electronic scattering arising from atomic-scale defects. Using Fourier transform STS, we map the energy versus momentum dispersion relations for monolayer and bilayer WSe2. Further, by tracking allowed and forbidden scattering channels as a function of energy we infer the spin texture of both the conduction and valence bands. We observe a large spin-splitting of the valence band due to strong spin-orbit coupling, and additionally observe spin-valley-layer coupling in the conduction band of bilayer WSe2.

Original languageEnglish (US)
JournalPhysical Review Letters
Volume115
Issue number13
DOIs
StatePublished - Sep 24 2015

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polarization
conduction bands
valence
scanning
scattering
spectroscopy
valleys
scanning tunneling microscopy
textures
binding energy
kinetic energy
orbits
photoluminescence
energy
defects
electronics

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Local spectroscopic characterization of spin and layer polarization in WSe2. / Yankowitz, Matthew; McKenzie, Devin; Leroy, Brian J.

In: Physical Review Letters, Vol. 115, No. 13, 24.09.2015.

Research output: Contribution to journalArticle

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