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Exciton Hall effect in monolayer MoS2.

Masaru Onga1, Yijin Zhang2,3, Toshiya Ideue1

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Researchers observed the Hall effect in excitons, composite particles in semiconductors. This finding reveals insights into quantum transport and opens avenues for exciton-based valleytronics in 2D materials.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Mechanics

Background:

  • The spontaneous Hall effect, driven by quantum Berry phase, reveals topological properties of quasiparticles.
  • Excitons, composite particles of electrons and holes, are crucial for optical responses in semiconductors.
  • Controlling information flow via spin and valley degrees of freedom is a key area in spintronics and valleytronics.

Purpose of the Study:

  • To directly observe and characterize the Hall effect of excitons.
  • To investigate the valley-selective spatial transport of excitons.
  • To explore the potential of exciton-based valleytronics in two-dimensional (2D) materials.

Main Methods:

  • Polarization-resolved photoluminescence (PL) mapping was employed to visualize exciton behavior.
  • Monolayer molybdenum disulfide (MoS2) was used as the 2D material system.
  • Microscopic spatial mapping was performed to observe transport phenomena.

Main Results:

  • The Hall effect of excitons was directly observed in monolayer MoS2.
  • Valley-selective spatial transport of excitons was demonstrated on a micrometer scale.
  • The observed Hall angle for excitons significantly exceeded that of single electrons in the same material.

Conclusions:

  • Exciton quantum transport is strongly influenced by their composite internal structure.
  • The study presents a fundamental challenge to the understanding of the Hall effect in composite particles.
  • This work provides a pathway for developing exciton-based valleytronic devices in 2D materials.