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Valleytronics: Opportunities, Challenges, and Paths Forward.

Steven A Vitale1, Daniel Nezich1, Joseph O Varghese1

  • 1MIT Lincoln Laboratory, 244 Wood Street, Lexington, MA, 02421, USA.

Small (Weinheim an Der Bergstrasse, Germany)
|August 14, 2018
PubMed
Summary
This summary is machine-generated.

Two-dimensional transition metal dichalcogenides offer unique valley addressability for novel information processing. This review explores the potential and challenges of using electron and hole momentum states in valleytronics.

Keywords:
quantum computingvalleytronic computingvalleytronics

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Information Science

Background:

  • Two-dimensional transition metal dichalcogenides (TMDs) possess unique electronic properties due to broken inversion symmetry and preserved time-reversal symmetry.
  • These symmetries allow for the independent control of electron, hole, and exciton states in distinct momentum-space valleys (K and K').
  • This valley degree of freedom presents a novel platform for information encoding and processing, termed valleytronics.

Purpose of the Study:

  • To review the opportunities and challenges in manipulating the valley degree of freedom in 2D TMDs.
  • To explore the potential of valleytronics for both quantum and classical information processing applications.
  • To consolidate findings from the 2017 Workshop on Valleytronic Materials, Architectures, and Devices.

Main Methods:

  • This review synthesizes findings and discussions from a dedicated workshop.
  • Analysis of theoretical proposals and experimental advancements in valley manipulation.
  • Exploration of device architectures and material requirements for valleytronic applications.

Main Results:

  • Valley addressability in 2D TMDs is a viable mechanism for spintronics and quantum information.
  • Significant progress has been made in controlling and detecting valley polarization.
  • Challenges remain in achieving robust valley coherence and efficient readout at room temperature.

Conclusions:

  • Valleytronics holds significant promise for next-generation electronic and quantum devices.
  • Further research is needed to overcome current limitations and realize practical valleytronic applications.
  • Interdisciplinary collaboration is crucial for advancing the field of valleytronics.