Observation by resonant tunneling of high-energy states in GaAs-Ga1-xAlxAs quantum wells

The current-voltage characteristics of Ga1-xAlxAs-GaAs-Ga1-xAlx As double-barrier devices show, in addition to resonant tunneling via quasibound states, well-defined structures corresponding to energies higher than the barrier height. These new features are interpreted as resonant tunneling through confined states in Ga1-xAlxAs, at the X point of the Brillouin zone. © 1986 The American Physical Society.