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The Frequency Domain Thermoreflectance Technique for Thermal Property Measurements
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Room-temperature valleytronic transistor.

Lingfei Li1,2, Lei Shao3, Xiaowei Liu4

  • 1School of Electronic Science and Engineering, Nanjing University, Nanjing, China.

Nature Nanotechnology
|July 22, 2020
PubMed
Summary
This summary is machine-generated.

This study introduces a room-temperature solid-state device for valleytronics, enabling the generation, propagation, and manipulation of valley information. This breakthrough paves the way for next-generation electronic devices beyond CMOS technology.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Nanotechnology

Background:

  • Valleytronics utilizes the valley degree of freedom for information processing, offering potential beyond traditional charge-based electronics (CMOS).
  • Previous research explored valleytronic properties mainly at low temperatures, with limited demonstrations of transistor-like building blocks at room temperature.

Purpose of the Study:

  • To demonstrate a room-temperature solid-state device capable of generating, propagating, detecting, and manipulating valley information.
  • To develop valleytronic building blocks for next-generation information devices.

Main Methods:

  • Utilizing chiral nanocrescent plasmonic antennae for selective generation of valley-polarized carriers in MoS2 via hot-electron injection.
  • Employing a valley Hall configuration for detection of valley-polarized free carriers without charge current.
  • Implementing electrostatic gating to modulate the valley Hall voltage.

Main Results:

  • Demonstrated a full sequence of valley information processing (generation, propagation, detection, manipulation) at room temperature.
  • Achieved propagation of valley-polarized free carriers over 18 μm.
  • Showcased electrostatic gating's ability to control valley Hall voltage, enabling transistor-like operation with pure valleytronic input/output.

Conclusions:

  • The developed device enables encoding and processing information using the valley degree of freedom.
  • This work provides a universal strategy for studying Berry curvature dipole in quantum materials.
  • The findings represent a significant step towards practical room-temperature valleytronic devices.