Abstract
Using inelastic light scattering, we measure the zone-center electronic excitation modes in a set of multiple quantum wells. The width of the wavefunction barriers was chosen such that it prevents significant coupling of the electron ground states between wells yet is transparent to electron tunneling under an electric field. Under these conditions, we find charge-density-like and spin-density-like plasmons whose energies do not correspond to the excitations calculated for either a single well or a set of Coulomb-coupled wells. The observed energies are proportional to the electric field strength and the lower energy modes agree with predictions for plasmons tunneling between the Wannier-Stark ladder states.
Original language | American English |
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Number of pages | 6 |
Journal | Journal of Applied Physics |
Volume | 123 |
Issue number | 21 |
DOIs | |
State | Published - 2018 |
NREL Publication Number
- NREL/JA-5K00-71495
Keywords
- chemical kinetics
- electron gas
- lasers
- light scattering
- phonons
- quantum wells
- semiconductors
- single particle tunneling