Finite Temperature Effects of the Pressure-Driven Quantum Hall to Nematic Phase Transition in the Second Landau Level

ORAL

Abstract

The second Landau level of a two-dimensional electron gas is known to exhibit a rich variety of electronic phases which are close in energy. Within the second Landau level we have recently reported a pressure-driven quantum phase transition from a fractional quantum Hall state to an electronic nematic, or stripe, phase occurring at the Landau level filling factor 5/2. This phase transition is special as it is one of the very few known examples of a transition between a topologically ordered phase and a traditional Landau phase. We now report on the temperature dependence of the fractional quantum Hall state and the nematic phase at filling factor 5/2 as they evolve with pressure. In particular, we trace the energy gap of the fractional quantum Hall state and the onset temperature of the nematic state. From these measurements, we obtain a phase diagram of competing phases with topological and nematic orders.

*This work was supported by the DOE grant DE-SC0006671.

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Authors

  • Katherine Schreiber

    • Purdue University

  • Nodar Samkharadze

    • Purdue University

  • Geoffrey Gardner

    • Purdue University

  • Michael Manfra

    • Department of Physics, Birck Nanotechnology Center, Schools of Electrical and Computer Engineering and Materials Engineering, Purdue University
    • Purdue University

  • Rudro Biswas

    • Purdue University

  • G\'abor Cs\'athy

    • Purdue University