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Investigations of Dynamics in the Quantum Hall Regime by Time-Resolved Measurements

Matsuura Masahiro 東北大学

2020.03.25

概要

In this thesis, the dynamics in the quantum Hall regime were investigated using a time-domain charge transport measurement and a photoluminescence microscopy. In this chapter, the main results and discussions are summarised.

The time-domain charge transport measurement was performed on a QH device fabricated from a GaAs/AlGaAs heterostructure wafer. The transport properties of the charge wave packet (excited QH edge state) were studied at filling factor ν = 1 QH regime. We observed the waveform of the charge packet, which is proportional to the time derivative of the applied square voltage wave. Further, we study the transmission and reflection behaviors of the charge-density wave packet by applying a voltage to another front gate electrode to control the path of the edge state. It was shown that the threshold voltages where the dominant direction is switched in either transmission or reflection for dense and sparse wave packets are different from the threshold voltage where the current stops flowing in an equilibrium state . From these results, it was interpreted that the dense and sparse regions of the charge-density wave packet wave packet correspond to convexity and concavity of the boundary of the two-dimensional electron system (2DES).

We also conducted time-resolved photoluminescence (PL) measurements with a QH device with a GaAs/AlGaAs quantum well structure to investigate the radiative decay time of the charged excitons in a QH regime. It was found that the decay time for the singlet state is longer than the triplet state. Further more, the decay times of the both states reach the longest in the vicinity of the ν = 1, 2/5 regions. This is interpreted to mean that the localization of the electron and hole wavefunctions diminish the overlap integral in the QH system.

Finally, we performed a novel measurement which utilizes the time and spatially resolved microscopy.A concavity-like pattern was observed in the PL intensity map plotted as func- tion of time and space.It was interpreted that the propagation of the excited edge state is accompanied by the density wave and deformation of the confinement potential. This results provides the relevant information that supports the Wen’s theory.

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