Layer-dependent quantum cooperation of electron and hole states in the anomalous semimetal WTe2

Pranab Kumar Das, D. Di Sante, I. Vobornik, J. Fujii, T. Okuda, E. Bruyer, A. Gyenis, B. E. Feldman, J. Tao, R. Ciancio, G. Rossi, M. N. Ali, S. Picozzi, A. Yadzani, G. Panaccione and R. J. Cava ()
Additional contact information
Pranab Kumar Das: Istituto Officina dei Materiali (IOM)-CNR, Laboratorio TASC, in Area Science Park
D. Di Sante: Consiglio Nazionale delle Ricerche—CNR-SPIN
I. Vobornik: Istituto Officina dei Materiali (IOM)-CNR, Laboratorio TASC, in Area Science Park
J. Fujii: Istituto Officina dei Materiali (IOM)-CNR, Laboratorio TASC, in Area Science Park
T. Okuda: Hiroshima Synchrotron Radiation Center (HSRC), Hiroshima University
E. Bruyer: Consiglio Nazionale delle Ricerche—CNR-SPIN
A. Gyenis: Princeton University
B. E. Feldman: Princeton University
J. Tao: Brookhaven National Laboratory
R. Ciancio: Istituto Officina dei Materiali (IOM)-CNR, Laboratorio TASC, in Area Science Park
G. Rossi: Istituto Officina dei Materiali (IOM)-CNR, Laboratorio TASC, in Area Science Park
M. N. Ali: Princeton University
S. Picozzi: Consiglio Nazionale delle Ricerche—CNR-SPIN
A. Yadzani: Princeton University
G. Panaccione: Istituto Officina dei Materiali (IOM)-CNR, Laboratorio TASC, in Area Science Park
R. J. Cava: Princeton University

Nature Communications, 2016, vol. 7, issue 1, 1-8

Abstract: Abstract The behaviour of electrons and holes in a crystal lattice is a fundamental quantum phenomenon, accounting for a rich variety of material properties. Boosted by the remarkable electronic and physical properties of two-dimensional materials such as graphene and topological insulators, transition metal dichalcogenides have recently received renewed attention. In this context, the anomalous bulk properties of semimetallic WTe2 have attracted considerable interest. Here we report angle- and spin-resolved photoemission spectroscopy of WTe2 single crystals, through which we disentangle the role of W and Te atoms in the formation of the band structure and identify the interplay of charge, spin and orbital degrees of freedom. Supported by first-principles calculations and high-resolution surface topography, we reveal the existence of a layer-dependent behaviour. The balance of electron and hole states is found only when considering at least three Te–W–Te layers, showing that the behaviour of WTe2 is not strictly two dimensional.

Date: 2016
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DOI: 10.1038/ncomms10847

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