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Experiments with Interacting one-dimensional electrons

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  • User Sanjeev Kumar, UCL
  • ClockThursday 23 July 2020, 13:00-14:15
  • Housevia zoom.

If you have a question about this talk, please contact C.VonKeyserlingk.

In this presentation, I will show experimental results of one-dimensional (1D) quantum wire realised using GaAs/AlGaAs heterostructure by squeezing the two-dimensional electron gas using a pair of split gates and a top gate. Lowering confinement potential and reducing carrier concentration lead to the disappearance of the first plateau at 2e2/h, thus, the new ground state is at 4e2/h, indicating a row of electrons bifurcating into two, which was confirmed with transverse electron focusing. This is the formation of the Incipient Wigner Lattice, which is expected to provide rich spin and charge phases. I will conclude by showing recent experimental results in the low-density regime or the Wigner regime, showing the emergence of non-magnetic fractional conductance plateaus (in units of e^2/h) at values of 1/6, 2/5, 1/5, etc.

Kumar et al Physical Review Letters 122 (8), 086803, 2019 Kumar et al, Applied Physics Letters 115 (12), 123104, 2019 Ho et al, Physical Review Letters 121, 106801, 2018

This talk is part of the Theoretical Physics Seminars series.

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