Observation of resonant tunneling through a quantized state in InP quantum dots in a double-barrier heterostructure

Reddy, C. V.; Reddy, C.V.; Narayanamurti, V.; Ryou, J. H.; Ryou, J.H.; Chowdhury, U.; Dupuis, R. D.; Dupuis, R.D.
August 2000
Applied Physics Letters;8/21/2000, Vol. 77 Issue 8
Academic Journal
A direct spectroscopic signature associated with the quantized state of the charge carriers in three-dimensionally confined InP quantum dots (QDs) is reported using a ballistic electron emission microscopy (BEEM)/spectroscopy technique. The self-assembled InP QDs are sandwiched in an AlInP double-barrier heterostructure. The excellent nanometer-scale lateral resolution of the BEEM technique is used to investigate the current transport mechanism by the direct injection of electrons into a single quantum dot. The BEEM spectra taken on and off the dot revealed the presence of a localized state at around 0.1±0.02 eV above the ground state. © 2000 American Institute of Physics.


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