Layer-dependent electronic structure of an atomically heavy two-dimensional dichalcogenide

Yeh, Po-Chun; Jin, Wencan; Zaki, Nader; Zhang, Datong; Liou, Jonathan T.; Sadowski, Jerzy T.; Al-Mahboob, Abdullah; Dadap, Jerry I.; Herman, Irving P.; Sutter, Peter; Osgood, Richard M.

doi:10.1103/PhysRevB.91.041407

Layer-dependent electronic structure of an atomically heavy two-dimensional dichalcogenide

Journal Article · Tue Jan 20 00:00:00 EST 2015 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PhysRevB.91.041407· OSTI ID:1384789

Yeh, Po-Chun ^[1]; Jin, Wencan ^[1]; Zaki, Nader ^[1]; Zhang, Datong ^[1]; Liou, Jonathan T. ^[1]; Sadowski, Jerzy T. ^[2]; Al-Mahboob, Abdullah ^[2]; Dadap, Jerry I. ^[1]; Herman, Irving P. ^[1]; Sutter, Peter ^[2]; Osgood, Richard M. ^[1]

Columbia Univ., New York, NY (United States)
Brookhaven National Lab. (BNL), Upton, NY (United States). Center for Functional Nanomaterials (CFN)

Here we report angle-resolved photoemission spectroscopic measurements of the evolution of the thickness-dependent electronic band structure of the atomically heavy two-dimensional layered dichalcogenide, tungsten diselenide

(WS e_{2})

. Our data, taken on mechanically exfoliated

WS e_{2}

single crystals, provide direct evidence for shifting of the valence-band maximum from

\bar{Γ}

(multilayer

WS e_{2}

) to

\bar{K}

(single-layer

WS e_{2}

). Further, our measurements also set a lower bound on the energy of the direct band gap and provide direct measurement of the hole effective mass.

View Accepted Manuscript (DOE)

Research Organization:: Brookhaven National Lab. (BNL), Upton, NY (United States). National Synchrotron Light Source; Energy Frontier Research Centers (EFRC) (United States). Re-Defining Photovoltaic Efficiency Through Molecule Scale Control (RPEMSC)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division; USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Scientific User Facilities Division

Grant/Contract Number:: AC02-98CH10886; FG02-04ER46157; SC0001085

OSTI ID:: 1384789

Alternate ID(s):: OSTI ID: 1210410
OSTI ID: 1229184
OSTI ID: 1169570
OSTI ID: 1180227

Journal Information:: Physical Review. B, Condensed Matter and Materials Physics, Journal Name: Physical Review. B, Condensed Matter and Materials Physics Journal Issue: 4 Vol. 91; ISSN 1098-0121; ISSN PRBMDO

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Strain dependence of band gaps and exciton energies in pure and mixed transition-metal dichalcogenides Defo, Rodrick Kuate; Fang, Shiang; Shirodkar, Sharmila N. Physical Review B, Vol. 94, Issue 15 https://doi.org/10.1103/physrevb.94.155310	journal	October 2016
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Tunable Γ − K Valley Populations in Hole-Doped Trilayer WSe 2 Movva, Hema C. P.; Lovorn, Timothy; Fallahazad, Babak Physical Review Letters, Vol. 120, Issue 10 https://doi.org/10.1103/physrevlett.120.107703	journal	March 2018
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