Electrical detection of excitonic states by time-resolved conductance measurements

Ebler, C. and Labud, P.A. and Rai, A.K. and Reuter, D. and Wieck, A.D. and Ludwig, Ar.

Volume: 101 Pages:
DOI: 10.1103/PhysRevB.101.125303
Published: 2020

We present time-resolved conductance measurements and charge spectra for the conduction-band states of InAs quantum dots after creating metastable holes by illumination. We demonstrate an electrical way of measuring the conduction-band energy offset and inverse tunnel rates of electrons from a two-dimensional electron gas into neutral (X0), single positively (X1+), and double positively (X2+) charged exciton states. The experiment also gives information about the metastable hole storage time and discharge dynamics. © 2020 American Physical Society.

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