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Related Experiment Videos

Dissipationless quantum spin current at room temperature.

Shuichi Murakami1, Naoto Nagaosa, Shou-Cheng Zhang

  • 1Department of Applied Physics, University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-8656, Japan. murakami@appi.t.u-tokyo.ac.jp

Science (New York, N.Y.)
|August 9, 2003
PubMed
Summary
This summary is machine-generated.

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Researchers predict electric fields can create dissipationless quantum spin currents in semiconductors at room temperature. This breakthrough could enable low-power, reversible quantum computing and spintronic devices.

Area of Science:

  • Quantum physics
  • Condensed matter physics
  • Materials science

Background:

  • Microscopic laws are time-reversible, but macroscopic processes like energy transport are irreversible, causing dissipation in electronic devices.
  • This irreversibility limits the potential for efficient quantum computation.

Purpose of the Study:

  • To theoretically predict a method for generating dissipationless quantum spin currents.
  • To explore the potential for low-power, reversible quantum computation and spintronics.

Main Methods:

  • Theoretical prediction based on a generalization of the quantum Hall effect.
  • Investigated hole-doped semiconductors (Si, Ge, GaAs) at room temperature.

Main Results:

Related Experiment Videos

  • Electric fields can induce substantial dissipationless quantum spin currents.
  • Efficient spin injection is achievable without metallic ferromagnets.

    • Conclusions:

    • The findings pave the way for novel quantum spintronic devices with integrated processing and storage.
    • Potential for low-power consumption and reversible quantum computation.