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Related Experiment Videos

Spontaneous spin polarization in quantum point contacts.

L P Rokhinson1, L N Pfeiffer, K W West

  • 1Department of Physics, Purdue University, West Lafayette, Indiana 47907, USA.

Physical Review Letters
|May 23, 2006
PubMed
Summary

We measured spin polarization in quantum point contacts using magnetic focusing. Polarization was observed at low densities, especially in samples exhibiting the "0.7 structure," indicating spin-dependent transport phenomena.

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Area of Science:

  • Condensed matter physics
  • Quantum electronics
  • Spintronics

Background:

  • Quantum point contacts (QPCs) are crucial nanoscale electronic devices.
  • Understanding spin polarization in QPCs is key for spintronics applications.
  • Previous studies have explored QPC properties, but direct probing of spin polarization in specific regimes remains an active area.

Purpose of the Study:

  • To investigate the spin polarization of quantum point contacts.
  • To probe spin-dependent transport phenomena in p-type GaAs/AlGaAs heterostructures.
  • To correlate spin polarization with the "0.7 structure" in QPCs.

Main Methods:

  • Utilized spatial spin separation via a magnetic focusing technique.
  • Fabricated quantum point contacts from p-type GaAs/AlGaAs heterostructures.

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  • Measured conductance of QPCs and tuned them to specific conductivity regimes (< 2e2/h).

    • Main Results:

    • A finite spin polarization was detected in the low-density regime.
    • The measured polarization was dependent on the conductance of the quantum point contact.
    • Significantly stronger polarization was observed in samples featuring a well-defined "0.7 structure".

    Conclusions:

    • Spatial spin separation is an effective method for probing QPC polarization.
    • Low-density regimes and the "0.7 structure" are associated with significant spin polarization in QPCs.
    • These findings contribute to the understanding of spin-dependent transport in mesoscopic systems.