Pressure induced topological quantum phase transition in Weyl semimetal T_d-MoTe_2
arXiv:2003.12860 · doi:10.7566/JPSJ.89.094707
Abstract
We report the pressure (p_max = 1.5 GPa) evolution of the crystal structure of the Weyl semimetal T_d-MoTe_2 by means of neutron diffraction experiments. We find that the fundamental non-centrosymmetric structure T_d is fully suppressed and transforms into a centrosymmertic 1T' structure at a critical pressure of p_cr = 1.2 GPa. This is strong evidence for a pressure induced quantum phase transition (QPT) between topological to a trivial electronic state. Although the topological QPT has strong effect on magnetoresistance, it is interesting that the superconducting critical temperature T_c, the superfluid density, and the SC gap all change smoothly and continuously across p_cr and no sudden effects are seen concomitantly with the suppression of the T_d structure. This implies that the T_c, and thus the SC pairing strength, is unaffected by the topological QPT. However, the QPT requires the change in the SC gap symmetry from non-trivial s+- to a trivial s++ state, which we discuss in this work. Our systematic characterizations of the structure and superconducting properties associated with the topological QPT provide deep insight into the pressure induced phase diagram in this topological quantum material.
arXiv comment9 pages, 4 figures
References in corpus (26)
- Type-II Weyl Semimetals
- Titanic Magnetoresistance in WTe2
- Experimental observation of topological Fermi arcs in type-II Weyl semimetal MoTe2
- Superconductivity in Weyl Semimetal Candidate MoTe2
- Topological Crystalline Insulators and Topological Superconductors: From Concepts to Materials
- Prediction of the Weyl semimetal in the orthorhombic MoTe2
- Spectroscopic evidence for type II Weyl semimetal state in MoTe2
- MoTe2: A Type-II Weyl Topological Metal
- Pressure-driven dome-shaped superconductivity and electronic structural evolution in tungsten ditelluride
- Superconductivity emerging from suppressed large magnetoresistant state in WTe2
- Consequences of a condensed matter realization of Lorentz violating QED in Weyl semi-metals
- Quantum oscillations, thermoelectric coefficients and the Fermi surface of semi-metallic WTe2
- Fermi arcs and their topological character in the candidate type-II Weyl semimetal MoTe2
- Possible topologically non-trivial superconducting order parameter in type-II Weyl semimetal T_d-MoTe_2
- Time-reversal invariant topological superconductivity in doped Weyl semimetals
- Origin of the superconductivity of WTe2 under pressure
- Superconductivity enhancement in the S-doped Weyl semimetal candidate MoTe2
- Bulk Fermi-surface of the Weyl type-II semi-metallic candidate MoTe2
- Anticorrelation between polar lattice instability and superconductivity in the Weyl semimetal candidate MoTe2
- Atomic-scale visualization of quasiparticle interference on a type-II Weyl semimetal surface
- 1T`-MoTe2 single crystal: a possible topological superconductor
- Universal signatures of Fermi arcs in quasiparticle interference on the surface of Weyl semimetals
- Mechanical control of crystal symmetry and superconductivity in Weyl semimetal MoTe
- Spin-resolved electronic response to the phase transition in MoTe
- Giant enhancement of cryogenic thermopower by polar structural instability in the pressurized semimetal MoTe2
- Absence of Local Fluctuating Dimers in Superconducting Ir(Pt,Rh)Te