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Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
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Light-Tunable 1T-TaS2 Charge-Density-Wave Oscillators.

Chao Zhu1, Yu Chen2, Fucai Liu1,3

  • 1Center for Programmable Materials, School of Materials Science and Engineering , Nanyang Technological University , Singapore 639798 , Singapore.

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|October 10, 2018
PubMed
Summary
This summary is machine-generated.

Joule heating influences charge density wave (CDW) transitions in 1T-TaS2, playing a minor role in one transition and a dominant one in another. Light can also tune these CDW phases at room temperature.

Keywords:
1T-TaS2in situ Raman spectroscopylight tunabilityoscillatorphase transition

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Area of Science:

  • Condensed Matter Physics
  • Materials Science

Background:

  • External stimuli control of phase transitions is crucial for fundamental physics and device engineering.
  • Charge density waves (CDW) are metastable electronic phases characterized by periodic lattice distortion.
  • Understanding external control mechanisms for CDW phases is an active research area.

Purpose of the Study:

  • To investigate the role of Joule heating in electric-field-induced CDW transitions in ultrathin 1T-TaS2.
  • To explore the influence of light illumination on CDW phases in 1T-TaS2 at room temperature.

Main Methods:

  • In situ observation of electric-field-driven phase transitions using Raman spectroscopy.
  • Quantitative evaluation of Joule heating effects during CDW transitions.
  • Assessment of light illumination's impact on CDW phase modulation.

Main Results:

  • Joule heating plays a secondary role in the nearly commensurate (NC) to incommensurate (IC) CDW transition.
  • Joule heating dominates the IC-NC CDW transition.
  • Light illumination can modulate the CDW phase and tune oscillator frequencies in ultrathin 1T-TaS2 at room temperature.

Conclusions:

  • Joule heating has a differential impact on various CDW transitions, offering insights into electric-field-induced phenomena.
  • Light-induced modulation of CDW phases presents opportunities for developing multifunctional devices.