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 [10.1002/adom.202201082].

Optical Manipulation of the Rashba Effect in Germanium Quantum Wells

Simone Rossi
Primo
;
Marta Raimondo;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.
Si
Articolo in rivista - Articolo scientifico
Scientifica
Ge quantum wells; group IV heterostructures; photoluminescence; Rashba effect;
English
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 [10.1002/adom.202201082].
Rossi, S; Talamas Simola, E; Raimondo, M; Acciarri, M; Pedrini, J; Balocchi, A; Marie, X; Isella, G; Pezzoli, F
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/10281/390507
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