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Atomic Layer Deposition of Vanadium Dioxide and a Temperature-dependent Optical Model
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Polymorphic Spin, Charge, and Lattice Waves in Vanadium Ditelluride.

Dongyeun Won1, Do Hoon Kiem2, Hwanbeom Cho3,4

  • 1Department of Energy Science, Sungkyunkwan University, Suwon, 16419, Korea.

Advanced Materials (Deerfield Beach, Fla.)
|February 7, 2020
PubMed
Summary
This summary is machine-generated.

Vanadium ditelluride (VTe2) exhibits unique room-temperature charge density wave (CDW) phases, controllable by doping. These phases feature distinct antiferromagnetic spin orderings, paving the way for novel quantum devices.

Keywords:
charge density wavespolymorphismtransition metal dichalcogenidesvanadium ditelluride

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Materials

Background:

  • Transition metal dichalcogenides (TMDs) host complex quantum phenomena like charge density waves (CDWs) and 2D magnetism, driven by lattice distortion, spin interactions, and dimensional crossover.
  • Interactions such as spin-orbit, electron-phonon, and electron-electron typically stabilize a single quantum phase under specific conditions, limiting device applications requiring multiple quantum states.
  • Controlling and switching between different quantum phases in materials is crucial for advancing quantum device functionalities.

Purpose of the Study:

  • To investigate the existence and characteristics of nontrivial polymorphic quantum states in vanadium ditelluride (VTe2).
  • To explore the influence of doping concentration on the formation of different charge density wave (CDW) phases in VTe2 at room temperature and ambient conditions.
  • To understand the interplay between charge density waves and magnetic ordering in VTe2 for potential quantum device applications.

Main Methods:

  • Experimental synthesis and characterization of vanadium ditelluride (VTe2) with varying doping concentrations.
  • Investigation of structural, electronic, and magnetic properties to identify distinct charge density wave (CDW) phases.
  • First-principles calculations to elucidate the coupling between magnetic ordering and CDW phases.

Main Results:

  • Discovery of two distinct charge density wave (CDW) phases in vanadium ditelluride (VTe2) that are stable at room temperature.
  • Demonstration that doping concentration precisely controls the formation of either of the two CDW phases in VTe2 under ambient conditions.
  • Observation of different antiferromagnetic spin orderings associated with each CDW polymorph, involving unique stripe-patterned spin waves in vanadium atoms.
  • First-principles calculations confirm a critical coupling between the magnetic ordering and the corresponding CDW in VTe2.

Conclusions:

  • Vanadium ditelluride (VTe2) exhibits unique polymorphic quantum states, specifically two distinct CDW phases, at room temperature, controllable via doping.
  • The identified CDW phases are intrinsically linked to specific antiferromagnetic spin orderings, suggesting a rich phase diagram.
  • The coexistence of polymorphic spin, charge, and lattice waves in VTe2 opens avenues for novel conceptual quantum state-switching device applications.