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Spin-Resolved Electronic Response to the Phase Transition in MoTe_{2}
Andrew P Weber1,2,3, Philipp Rüßmann4, Nan Xu1,2
1Institute of Physics, École Polytechnique Fédérale de Lausanne, CH-1015, Lausanne, Switzerland.
Researchers studied molybdenum ditelluride (MoTe2) and found a 3D spin-texture in its noncentrosymmetric phase. Surface states persist above the transition temperature, indicating a polar instability near the surface.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Surface Science
Background:
- Molybdenum ditelluride (MoTe2) is a semimetal exhibiting a structural transition.
- Understanding the electronic properties and spin textures of MoTe2 is crucial for its potential applications.
Purpose of the Study:
- To investigate the spin-texture and surface states of MoTe2 across its structural transition.
- To explore the behavior of Fermi arcs and quasiparticle lifetimes in different phases.
Main Methods:
- Spin- and angle-resolved photoemission spectroscopy (SARPES) was employed.
- First-principles calculations were used for comparison.
Main Results:
- A three-dimensional spin-texture was observed in the bulk Fermi surface of the low-temperature, noncentrosymmetric phase.
- Surface Fermi arcs and bulk spin-texture were not entirely suppressed above the transition temperature.
- Quasiparticle lifetimes on Fermi arcs showed thermal history dependence, lengthening upon cooling.
Conclusions:
- The study reveals a persistent spin-texture and surface Fermi arcs in MoTe2 even above the bulk transition temperature.
- A novel polar instability near the surface is suggested when the bulk is in a centrosymmetric phase.
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