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Structural phase transition in monolayer MoTe2 driven by electrostatic doping.

Ying Wang1, Jun Xiao1, Hanyu Zhu1

  • 1NSF Nanoscale Science and Engineering Center (NSEC), 3112 Etcheverry Hall, University of California, Berkeley, California 94720, USA.

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|October 12, 2017
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Summary
This summary is machine-generated.

Researchers demonstrate electrostatic doping to control crystal phases in molybdenum ditelluride (MoTe2) monolayers. This breakthrough enables reversible phase transitions, paving the way for novel electronic devices.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Monolayers of transition-metal dichalcogenides (TMDs) possess diverse crystal phases with unique properties.
  • Controlling these phases is key to developing advanced materials and devices.
  • Previous phase transitions were induced thermally or chemically, limiting precise control.

Purpose of the Study:

  • To experimentally demonstrate electrostatic doping as a method to drive structural phase transitions in TMDs.
  • To investigate the characteristics and reversibility of these doping-induced phase changes.
  • To explore the potential for electrostatic control in atomically thin materials.

Main Methods:

  • Utilized electrostatic doping to induce phase transitions in monolayer molybdenum ditelluride (MoTe2).
  • Employed Raman spectroscopy to observe phase transitions and their hysteretic behavior.
  • Combined second-harmonic generation and polarization-resolved Raman spectroscopy to analyze crystal structure and orientation.

Main Results:

  • Successfully achieved an electrostatic-doping-driven phase transition between hexagonal and monoclinic phases in MoTe2.
  • Observed a hysteretic loop in Raman spectra, indicating reversible phase switching via gate voltage.
  • Confirmed that the induced monoclinic phase retains the crystal orientation of the original hexagonal phase.
  • Demonstrated that the phase transition occurs uniformly across the entire sample.

Conclusions:

  • Electrostatic doping provides a novel and effective method for controlling structural phase transitions in 2D materials.
  • This technique allows for reversible switching of material properties, opening avenues for phase-change devices.
  • The ability to electrostatically control crystal phases in atomically thin membranes has significant implications for future nanoelectronic applications.