Electrically induced bulk and edge excitations in the fractional quantum Hall regime

TL;DR

This study investigates how voltage pulses excite and reveal the dynamics of bulk and edge collective excitations in the fractional quantum Hall regime, linking topological states to potential quantum gravity analogs.

Contribution

It demonstrates electrically induced bulk and edge excitations in the fractional quantum Hall state and explores their dynamics, providing new insights into topological quantum states.

Findings

Bulk excitations have a group velocity of ~3 x 10^4 m/s.

Voltage pulse offset enhances excitation signals.

Bulk excitations match the magneto-plasmon model.

Abstract

We apply a voltage pulse to electrically excite the incompressible region of a two-dimensional electron liquid in the $\nu=2/3$ 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 $3 \times 10^4$ 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.