Electrically induced bulk and edge excitations in the fractional quantum Hall regime
Abstract
We apply a voltage pulse to electrically excite the incompressible region of a two-dimensional electron liquid in the =2/3 fractional quantum Hall state and investigate the collective excitations in both the edge and bulk via photoluminescence spectral energy shifts. Introducing an offset in the voltage pulse significantly enhances the excitation signal. Real-space and time-resolved measurements reveal the dynamics of the bulk excitations, with an estimated group velocity of approximately 3 × 104 m/s. These bulk excitations align well with the magneto-plasmon model. Our results highlight the topological link between edge and bulk states, providing a novel approach to exploring solid-state analogs of quantum gravity.
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