Quantum Oscillations, Thermoelectric Coefficients, and the Fermi Surface of Semimetallic WTe_{2}
Abstract
We present a study of angleresolved quantum oscillations of electric and thermoelectric transport coefficients in semimetallic WTe_{2}, which has the particularity of displaying a large B^{2} magnetoresistance. The Fermi surface consists of two pairs of electronlike and holelike pockets of equal volumes in a "Russian doll" structure. The carrier density, Fermi energy, mobility, and the meanfree path of the system are quantified. An additional frequency is observed above a threshold field and attributed to the magnetic breakdown across two orbits. In contrast to all other dilute metals, the Nernst signal remains linear in the magnetic field even in the highfield (ω_{c}τ ≫1 ) regime. Surprisingly, none of the pockets extend across the c axis of the first Brillouin zone, making the system a threedimensional metal with moderate anisotropy in Fermi velocity, yet a large anisotropy in the meanfree path.
 Publication:

Physical Review Letters
 Pub Date:
 May 2015
 DOI:
 10.1103/PhysRevLett.114.176601
 arXiv:
 arXiv:1502.07797
 Bibcode:
 2015PhRvL.114q6601Z
 Keywords:

 72.15.Jf;
 71.18.+y;
 71.20.Gj;
 Thermoelectric and thermomagnetic effects;
 Fermi surface: calculations and measurements;
 effective mass g factor;
 Other metals and alloys;
 Condensed Matter  Materials Science
 EPrint:
 5 pages, 3 figures, and 2 tables