Transition from a Fractional Quantum Hall Liquid to an Electron Solid at ν=1/3 in Tilted Magnetic Fields
Abstract
While theoretically predicted [see, for example, Y. Yu and S. Yang, Phys. Rev. B 66, 245318 (2002)], the transition from a fractional quantum Hall liquid to an electron solid with increasing in-plane magnetic field has not been observed so far. In this talk, we wish to present experimental results that demonstrate such a transition in a low density and an extremely high quality two-dimensional hole sample. At the temperature of 30mK there is a well-developed fractional quantum Hall (FQH) state at Landau level filling ν=1/3 at the magnetic field of 2.0T. By continuously tilting our sample in magnetic field, this state weakens. At the tilt angle of 80^0 and the in-plane magnetic field of 11.8T the longitudinal resistivity at ν=1/3 reaches 180kω/Box, a value about 7h/e^2, indicating that the 2D hole system has already been deep in the insulating regime. We attribute the observed crossover to the transition from the ν=1/3 FQH liquid to the weakly pinned Wigner solid, and argue that the observed transition is due to the strong coupling of Landau level subbands under the application of an in-plane magnetic field.
- Publication:
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APS March Meeting Abstracts
- Pub Date:
- March 2004
- Bibcode:
- 2004APS..MARY11014C