The Rashba effect in Ge/Si0.15Ge0.85 multiple quantum wells embedded in a p-i-n diode is studied through polarization and time-resolved photoluminescence. In addition to a sizeable redshift arising from the quantum-confined Stark effect, a threefold enhancement of the circular polarization degree of the direct transition is obtained by increasing the pump power over a 2 kW cm−2 range. This marked variation reflects an efficient modulation of the spin population and is further supported by dedicated investigations of the indirect gap transition. This study demonstrates a viable strategy to engineer the spin-orbit Hamiltonian through contactless optical excitation and opens the way toward the electro-optical manipulation of spins in quantum devices based on group-IV heterostructures.

Rossi, S., Talamas Simola, E., Raimondo, M., Acciarri, M., Pedrini, J., Balocchi, A., et al. (2022). Optical Manipulation of the Rashba Effect in Germanium Quantum Wells. ADVANCED OPTICAL MATERIALS, 10(18) [10.1002/adom.202201082].

Optical Manipulation of the Rashba Effect in Germanium Quantum Wells

Simone Rossi
Primo
;
Maurizio Acciarri;Jacopo Pedrini;Fabio Pezzoli
Ultimo
2022

Abstract

The Rashba effect in Ge/Si0.15Ge0.85 multiple quantum wells embedded in a p-i-n diode is studied through polarization and time-resolved photoluminescence. In addition to a sizeable redshift arising from the quantum-confined Stark effect, a threefold enhancement of the circular polarization degree of the direct transition is obtained by increasing the pump power over a 2 kW cm−2 range. This marked variation reflects an efficient modulation of the spin population and is further supported by dedicated investigations of the indirect gap transition. This study demonstrates a viable strategy to engineer the spin-orbit Hamiltonian through contactless optical excitation and opens the way toward the electro-optical manipulation of spins in quantum devices based on group-IV heterostructures.
Articolo in rivista - Articolo scientifico
Ge quantum wells; group IV heterostructures; photoluminescence; Rashba effect;
English
17-lug-2022
2022
10
18
2201082
open
Rossi, S., Talamas Simola, E., Raimondo, M., Acciarri, M., Pedrini, J., Balocchi, A., et al. (2022). Optical Manipulation of the Rashba Effect in Germanium Quantum Wells. ADVANCED OPTICAL MATERIALS, 10(18) [10.1002/adom.202201082].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/390507
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