Spinless composite fermions in an ultrahigh-quality strained Ge quantum well

Article English OPEN
Shi, Q. ; Zudov, M. A. ; Morrison, Christopher ; Myronov, Maksym (2015)
  • Publisher: American Physical Society
  • Related identifiers: doi: 10.1103/PhysRevB.91.241303
  • Subject: QC
    arxiv: Condensed Matter::Mesoscopic Systems and Quantum Hall Effect

We report on an observation of a fractional quantum Hall effect in an ultrahigh-quality two-dimensional hole gas hosted in a strained Ge quantum well. The Hall resistance reveals precisely quantized plateaus and vanishing longitudinal resistance at filling factors ν=2/3,4/3, and 5/3. From the temperature dependence around ν=3/2 we obtain the composite fermion mass of m☆≈0.4me, where me is the mass of a free electron. Owing to large Zeeman energy, all observed states are spin polarized and can be described in terms of spinless composite fermions.
  • References (40)
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    Q. Shi,1 M. A. Zudov,1,* C. Morrison,2 and M. Myronov2

    1School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA

    2Department of Physics, University of Warwick, Coventry, CV4 7AL, United Kingdom

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