Observation of new collective mode in the partially populated second Landau level

ORAL

Abstract

We present the observation of a new collective mode in the partially populated second Landau level. The mode is measured in experiments of resonant inelastic light scattering (RILS) at temperature of 40mK. Its energy is proportional to the square root of the filling factor of quasiholes for electron filling factors v equal or greater than v= 5/2 or quasiparticles for v equal or less than v= 5/2. This collective mode exists in the range 2.1 < v < 2.8. While the mode coexists with the fractional quantum Hall state at v= 7/3, it is absent at v= 5/2. Possible interpretations of this intriguing observation will be considered.

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Presenters

  • Aron Pinczuk

    Department of Applied Physics and Applied Mathematics and Department of Physics, Columbia University

Authors

  • Ursula Wurstbauer

    Walter Schottky Institut and Physik Department, Technische Universität München, Garching, Germany, and Nanosystems Initiative Munich (NIM)

  • Lingjie Du

    Department of Applied Physics and Applied Mathematics, Columbia University

  • Aron Pinczuk

    Department of Applied Physics and Applied Mathematics and Department of Physics, Columbia University

  • Michael Manfra

    Department of Physics and Astronomy and Station Q Purdue, Purdue University, Department of Physics and Astronomy and Microsoft Station Q Purdue, Purdue University, Purdue University, Physics, Purdue University, Purdue University, Station Q Purdue, Purdue Univ, Department of Physics and Astronomy, and School of Materials Engineering, and School of Electrical and Computer Engineering, Purdue University, Physics and Astronomy, Purdue University, Dept. of Physics and Astronomy, Purdue Univ

  • Loren Pfeiffer

    Electrical Engineering, princeton university, Department of Electrical Engineering, Princeton University, Princeton University, Princeton Univ, Electrical Engineering, Princeton Univ, EE, Princeton University

  • K West

    Electrical Engineering, princeton university, Department of Electrical Engineering, Princeton University, Princeton University, Univ of Basel, Princeton Univ, Electrical Engineering, Princeton Univ, EE, Princeton University