1. Optical Manipulation of the Rashba Effect in Germanium Quantum Wells.
- Author
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Rossi, Simone, Talamas Simola, Enrico, Raimondo, Marta, Acciarri, Maurizio, Pedrini, Jacopo, Balocchi, Andrea, Marie, Xavier, Isella, Giovanni, and Pezzoli, Fabio
- Subjects
RASHBA effect ,GERMANIUM ,PIN diodes ,STARK effect ,QUANTUM wells ,CIRCULAR polarization - 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. [ABSTRACT FROM AUTHOR]
- Published
- 2022
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