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Heating a crystalline solid increases the average energy of its atoms, molecules, or ions, and the solid gets hotter. At some point, the added energy becomes large enough to partially overcome the forces holding the molecules or ions of the solid in their fixed positions, and the solid begins the process of transitioning to the liquid state or melting. At this point, the temperature of the solid stops rising, despite the continual input of heat, and it remains constant until all of the solid is...
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Whether solid, liquid, or gas, a substance's state depends on the order and arrangement of its particles (atoms, molecules, or ions). Particles in the solid pack closely together, generally in a pattern. The particles vibrate about their fixed positions but do not move or squeeze past their neighbors. In liquids, although the particles are closely spaced, they are randomly arranged. The position of the particles are not fixed—that is, they are free to move past their neighbors to...
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A phase transition is the process in which a substance changes from one state of matter to another, like from a solid to a liquid, liquid to gas, or vice versa, at a specific temperature and under given pressure conditions. This change is spontaneous and is affected by alterations in temperature and pressure. These parameters impact the strength of the forces between molecules (intermolecular forces) in the substance.During a phase transition, both the initial and final phases of the substance...
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Electric-field Control of Electronic States in WS2 Nanodevices by Electrolyte Gating
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Temperature-Induced Lifshitz Transition in WTe2.

Yun Wu1, Na Hyun Jo1, Masayuki Ochi2,3

  • 1Ames Laboratory, U.S. DOE and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA.

Physical Review Letters
|November 10, 2015
PubMed
Summary

We discovered a temperature-induced Lifshitz transition in WTe2, causing hole pockets to vanish and impacting its electronic properties. This finding offers insights into semimetal behavior and transport anomalies.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Materials

Background:

  • Tungsten Ditelluride (WTe2) exhibits significant temperature-dependent magnetoresistance.
  • Understanding the electronic properties and Fermi surface topology is crucial for WTe2.

Purpose of the Study:

  • Investigate the electronic properties of WTe2 using advanced spectroscopic and transport techniques.
  • Identify the mechanism behind the large magnetoresistance and temperature-dependent anomalies.

Main Methods:

  • Ultrahigh resolution, tunable, vacuum ultraviolet laser-based, angle-resolved photoemission spectroscopy (ARPES).
  • Temperature- and field-dependent resistivity measurements.
  • Thermoelectric power (TEP) measurements.
  • Electronic structure calculations.

Main Results:

  • Observed a temperature-induced Lifshitz transition at approximately 160 K, marked by the disappearance of hole pockets.
  • Electronic structure calculations revealed a significant temperature-driven shift in chemical potential.
  • TEP measurements showed a slope change around 175 K and a breakdown of Kohler's rule between 70-140 K.

Conclusions:

  • The study elucidates the Lifshitz transition in WTe2 and its connection to transport anomalies.
  • The findings are relevant for understanding semimetals, including pnictides, 3D Dirac, and Weyl semimetals.