Abstract
Ballistic electron emission microscopy ~BEEM! is capable of injecting electrons into the L valley of a GaAs-AlAs double-barrier resonant tunneling diode ~DBRTD! coherently. Resonant tunneling through the L-valley confined states of the DBRTD is then observed as additional current onsets in the BEEM spectrum, followed by a characteristic linear regime. The corresponding ballistic transport mass is derived from the effective-mass tensor by a projection in @100# direction and differs considerably from the GaAs and AlAs longitudinal and transversal effective masses.
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