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Tightly bound trions in monolayer MoS2.

Kin Fai Mak1, Keliang He, Changgu Lee

  • 1Departments of Physics and Electrical Engineering, Columbia University, New York, NY 10027, USA.

Nature Materials
|December 4, 2012
PubMed
Summary

Researchers identified novel quasiparticles called negative trions in two-dimensional (2D) molybdenum disulfide (MoS2) atomic crystals. These quasiparticles have unique properties for future optoelectronic and valleytronic applications.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Two-dimensional (2D) atomic crystals like graphene and transition-metal dichalcogenides exhibit unique physical properties.
  • Monolayer molybdenum disulfide (MoS2) is a non-centrosymmetric material with a direct energy gap, unlike graphene.
  • Previous research demonstrated strong photoluminescence and high on/off ratios in MoS2 field-effect transistors.

Purpose of the Study:

  • To spectroscopically identify and characterize novel quasiparticles in monolayer MoS2.
  • To investigate the properties and potential applications of these quasiparticles in 2D atomic crystals.

Main Methods:

  • Fabrication of a monolayer MoS2 field-effect transistor.
  • Spectroscopic analysis to detect and study quasiparticles.
  • Optical creation of valley and spin polarized quasiparticles.

Main Results:

  • Spectroscopic identification of tightly bound negative trions (two electrons and a hole) in monolayer MoS2.
  • Demonstration that these negative trions can be optically created with polarized holes.
  • Observation of a large binding energy (~20 meV) for negative trions, significant even at room temperature.

Conclusions:

  • Negative trions in monolayer MoS2 are novel quasiparticles with no analogue in conventional semiconductors.
  • These findings open avenues for fundamental studies of many-body interactions.
  • Potential for future optoelectronic and valleytronic applications using 2D atomic crystals.