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Spin transition in the half-filled Landau level.

L A Tracy1, J P Eisenstein, L N Pfeiffer

  • 1California Institute of Technology, Pasadena, CA 91125, USA.

Physical Review Letters
|March 16, 2007
PubMed
Summary

Researchers studied spin polarization in two-dimensional electrons using resistively detected nuclear magnetic resonance (RDNMR). The nuclear spin-lattice relaxation time increased sharply at the transition to full polarization, indicating a key change in electron behavior.

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Area of Science:

  • Condensed matter physics
  • Quantum Hall effect
  • Two-dimensional electron systems

Background:

  • The behavior of two-dimensional (2D) electron systems at low temperatures and high magnetic fields is crucial for understanding quantum phenomena.
  • The transition from partial to complete spin polarization in the lowest Landau level is a key area of interest.

Purpose of the Study:

  • To investigate the transition from partial to complete spin polarization in 2D electrons at half filling of the lowest Landau level.
  • To characterize the changes in nuclear spin dynamics associated with this transition.

Main Methods:

  • Resistively detected nuclear magnetic resonance (RDNMR) was employed to probe the electronic system.
  • Nuclear spin-lattice relaxation time (T1) was measured as a function of electron density.

Main Results:

  • The nuclear spin-lattice relaxation time was found to be density independent in the partially polarized phase.
  • A sharp increase in T1 was observed at the transition to full spin polarization.
  • A strong maximum in the RDNMR signal was detected near the critical density at low temperatures.

Conclusions:

  • The study reveals distinct changes in nuclear spin dynamics accompanying the transition to full spin polarization.
  • RDNMR is a sensitive probe for detecting electronic phase transitions in 2D electron systems.
  • The observed behavior provides insights into electron-electron interactions and spin correlations in the quantum Hall regime.