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Title: Observation of Fermi arcs in the type-II Weyl semimetal candidate WTe 2

Journal Article · · Physical Review B

We use ultrahigh resolution, tunable, vacuum ultraviolet laser angle-resolved photoemission spectroscopy (ARPES) to study the electronic properties of WTe2, a material that was predicted to be a type-II Weyl semimetal. The Weyl fermion states in WTe2 were proposed to emerge at the crossing points of electron and hole pockets, and Fermi arcs connecting electron and hole pockets would be visible in the spectral function on (001) surface. Here we report the observation of such Fermi arcs in WTe2 confirming the theoretical predictions. This provides strong evidence for type-II Weyl semimetallic states in WTe2. Here, we also find that trivial and topological domains coexist on the same surface of the sample due to the presence of inhomogeneous strain detected by scanning electron microscopy data. This is in agreement with the theoretical prediction that strain can drive this system from topological Weyl to trivial semimetal. WTe2 therefore provides a tunable playground for studying exotic topological quantum effects.

Research Organization:
Ames Lab., Ames, IA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-07CH11358; GBMF4411; DMR-1420451
OSTI ID:
1337678
Alternate ID(s):
OSTI ID: 1324490
Report Number(s):
IS-J-9102; PRBMDO
Journal Information:
Physical Review B, Vol. 94, Issue 12; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 234 works
Citation information provided by
Web of Science

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Optical Response of MoTe2 and WTe2 Weyl Semimetals: Distinguishing between Bulk and Surface Contributions journal January 2020
Emerging in‐plane anisotropic two‐dimensional materials journal March 2019
Layered Topological Insulators and Semimetals for Magnetoresistance Type Sensors journal December 2018
Recent Advances in Quantum Effects of 2D Materials journal April 2019
Exploring Topological Superconductivity in Topological Materials journal July 2019
Discovery of a new type of topological Weyl fermion semimetal state in MoxW1−xTe2 journal December 2016
Edge conduction in monolayer WTe2 journal April 2017
Extremely high magnetoresistance and conductivity in the type-II Weyl semimetals WP2 and MoP2 journal November 2017
Evidence for topological type-II Weyl semimetal WTe2 journal December 2017
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Concurrence of superconductivity and structure transition in Weyl semimetal TaP under pressure journal December 2017
Temperature-driven topological transition in 1T'-MoTe2 journal January 2018
Topological chiral crystals with helicoid-arc quantum states journal March 2019
Nonsymmorphic symmetry protected node-line semimetal in the trigonal YH3 journal January 2018
Composition and temperature-dependent phase transition in miscible Mo1−xWxTe2 single crystals journal March 2017
Face-centered cubic MoS 2 : a novel superconducting three-dimensional crystal more stable than layered T-MoS 2 journal January 2018
In-plane anisotropic electronics based on low-symmetry 2D materials: progress and prospects journal January 2020
Magnetoresistance and anomalous Hall effect in micro-ribbons of the magnetic Weyl semimetal Co 3 Sn 2 S 2 journal March 2019
Magnetic exchange induced Weyl state in a semimetal EuCd 2 Sb 2 journal January 2020
Quasiparticle interference on type-I and type-II Weyl semimetal surfaces: a review journal January 2018
Surface plasmon polaritons in a waveguide composed of Weyl semimetals with different symmetries journal November 2019
Tunable surface plasmon polaritons in a Weyl semimetal waveguide journal June 2019
New developments in laser-based photoemission spectroscopy and its scientific applications: a key issues review journal April 2018
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Weak-value amplification for Weyl-point separation in momentum space journal October 2018
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Effect of aging-induced disorder on the quantum transport properties of few-layer WTe 2 journal December 2016
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Few-layer 1T′ MoTe 2 as gapless semimetal with thickness dependent carrier transport journal June 2018
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Polarization tensor for tilted Dirac fermion materials: Covariance in deformed Minkowski spacetime journal August 2019
Large enhancement of conductivity in Weyl semimetals with tilted cones: Pseudorelativity and linear response journal August 2019
Quantum oscillations of thermopower in WTe 2 thin films journal December 2019
Type-II Dirac surface states in topological crystalline insulators journal January 2017
MoTe 2 : An uncompensated semimetal with extremely large magnetoresistance journal June 2017
Topological phase transition due to strain-controlled evolution of the inverted bands in 1 T M X 2 journal June 2017
Anatomy of topological surface states: Exact solutions from destructive interference on frustrated lattices journal August 2017
Double Andreev reflections in type-II Weyl semimetal-superconductor junctions journal October 2017
Universal scattering response across the type-II Weyl semimetal phase diagram journal February 2018
Floquet Weyl semimetals in light-irradiated type-II and hybrid line-node semimetals journal April 2018
Epsilon-near-zero response and tunable perfect absorption in Weyl semimetals journal August 2018
Temperature-induced inversion of the spin-photogalvanic effect in WTe 2 and MoTe 2 journal September 2018
Anomalous Nernst effect and field-induced Lifshitz transition in the Weyl semimetals TaP and TaAs journal November 2018
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Passively Q-switched 1989  μm all-solid-state laser based on a WTe 2 saturable absorber journal January 2018
Waveguide modes in Weyl semimetals with tilted dirac cones journal January 2019
Versatile Crystal Structures and (Opto)electronic Applications of the 2D Metal Mono‐, Di‐, and Tri‐Chalcogenide Nanosheets journal March 2019
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Magnetic Field Enhanced Superconductivity in Epitaxial Thin Film WTe2 journal April 2018
Tuning the transport behavior of centimeter-scale WTe 2 ultrathin films fabricated by pulsed laser deposition journal July 2017
Origin of planar Hall effect in type-II Weyl semimetal MoTe 2 journal May 2019
Enhanced ultrafast relaxation rate in the Weyl semimetal phase of $MoTe_{2}$ measured by time- and angle-resolved photoelectron spectroscopy text January 2017
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Ferroelectric switching of a two-dimensional metal journal July 2018
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ARPES studies of the inverse perovskite Ca 3 PbO : Experimental confirmation of a candidate 3D Dirac fermion system journal October 2017
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