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Spin-orbit-induced circulating currents in a semiconductor nanostructure.

J van Bree1, A Yu Silov1, P M Koenraad1

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Physical Review Letters
|May 27, 2014
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Summary
This summary is machine-generated.

Electron spin-orbit interaction in quantum dots generates circulating orbital currents. These currents affect the total magnetic moment, influencing spin lifetimes and manipulation, even when spin and orbital moments cancel.

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Area of Science:

  • Quantum physics
  • Condensed matter physics

Background:

  • Electron spin possesses both spin and orbital magnetic moments.
  • Spin-orbit interaction is crucial for understanding electron behavior in confined systems like quantum dots.
  • The spatial distribution of these magnetic moments is key to their interactions.

Purpose of the Study:

  • To evaluate circulating orbital currents from spin-orbit interaction in a single electron spin quantum dot.
  • To analyze the impact of these currents on the total magnetic moment (spin and orbital) at zero magnetic field.
  • To understand the spatial differences between spin and orbital magnetic moment contributions.

Main Methods:

  • Explicit evaluation of circulating orbital currents.
  • Analysis of electronic states using conduction and valence envelope functions.
  • Zero magnetic field calculations.

Main Results:

  • Orbital currents are dominated by coherent superpositions of electronic envelope functions.
  • These currents vary smoothly within the quantum dot, peaking between the center and edge.
  • The spatial structure of the spin contribution differs significantly from the orbital contribution.
  • Even with zero net magnetic moment, spin interacts strongly with local magnetic fields.

Conclusions:

  • The spatial separation of spin and orbital magnetic moment contributions is significant.
  • Spin-orbit interaction-induced currents have implications for spin lifetimes.
  • These findings are important for spin manipulation in quantum computing and spintronics.