title: Tuning the magnetoresistance of ultrathin WTe2sheets by electrostatic gating.
abstract: The semimetallic, two-dimensional layered transition metal dichalcogenide WTe2has raised considerable interest due to its huge, non-saturating magnetoresistance. While for the origin of this effect, a close-to-ideal balance of electrons and holes has been put forward, the carrier concentration dependence of the magnetoresistance remains to be clarified. Here, we present a detailed study of the magnetotransport behaviour of ultrathin, mechanically exfoliated WTe2sheets as a function of electrostatic back gating. The carrier concentration and mobility, determined using the two band model and analysis of the Shubnikov-de Haas oscillations, indicate enhanced surface scattering for the thinnest sheets. By the back gate action, the magnetoresistance could be tuned by up to ∼100% for a ∼13 nm-thick WTe2sheet.
authors: Max-Planck-Institute for Solid State Research, Heisenbergstrasse 1, D-70569 Stuttgart, Germany. m.burghard@fkf.mpg.de.
authors: Junhong
authors: http://orcid.org/0000-0002-5314-2868
authors: J
authors: Na
authors: Max-Planck-Institute for Solid State Research, Heisenbergstrasse 1, D-70569 Stuttgart, Germany. m.burghard@fkf.mpg.de.
authors: Alexander
authors: A
authors: Hoyer
authors: Max-Planck-Institute for Solid State Research, Heisenbergstrasse 1, D-70569 Stuttgart, Germany. m.burghard@fkf.mpg.de.
authors: Leslie
authors: L
authors: Schoop
authors: Max-Planck-Institute for Solid State Research, Heisenbergstrasse 1, D-70569 Stuttgart, Germany. m.burghard@fkf.mpg.de.
authors: Daniel
authors: D
authors: Weber
authors: Max-Planck-Institute for Solid State Research, Heisenbergstrasse 1, D-70569 Stuttgart, Germany. m.burghard@fkf.mpg.de.
authors: Bettina V
authors: BV
authors: Lotsch
authors: Max-Planck-Institute for Solid State Research, Heisenbergstrasse 1, D-70569 Stuttgart, Germany. m.burghard@fkf.mpg.de.
authors: Marko
authors: M
authors: Burghard
authors: Max-Planck-Institute for Solid State Research, Heisenbergstrasse 1, D-70569 Stuttgart, Germany. m.burghard@fkf.mpg.de and Institut de Physique, École Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland.
authors: Klaus
authors: K
authors: Kern