论文信息 - Tuning the onset voltage of resonant tunneling through InAs quantum dots by growth parameters

Tuning the onset voltage of resonant tunneling through InAs quantum dots by growth parameters

We investigated the size dependence of the ground-state energy in self-assembled InAs quantum dots embedded in resonant tunneling diodes. Individual current steps observed in the current–voltage characteristics are attributed to resonant single-electron tunneling via the ground state of individual InAs quantum dots. The onset voltage of the first step observed is shown to decrease systematically from 200 mV to 0 with increasing InAs coverage. We relate this to a coverage-dependent size of InAs dots grown on AlAs. The results are confirmed by atomic force micrographs and photoluminescence experiments on reference samples.

[1] K. Pierz,et al. Shot noise in self-assembled InAs quantum dots , 2002, cond-mat/0207266.

[2] Torino,et al. Electro-optical properties of semiconductor quantum dots: Application to quantum information processing , 2001, cond-mat/0108334.

[3] K. Pierz,et al. Magnetic-field-induced singularities in spin-dependent tunneling through InAs quantum dots , 2000, cond-mat/0003400.

[4] K. Pierz,et al. Size determination of InAs quantum dots using magneto-tunnelling experiments , 1999 .

[5] G. Salamo,et al. Morphology of InAs self-organized islands on AlAs surfaces , 1999 .

[6] T. Ihn,et al. Observation of spin splitting in single InAs self-assembled quantum dots in AlAs , 1998 .

[7] K. Nomoto,et al. Tunneling Spectroscopy of InAs Wetting Layers and Self-Assembled Quantum Dots: Resonant Tunneling through Two- and Zero-Dimensional Electronic States , 1997 .

[8] Takeshi Noda,et al. Resonant tunneling of electrons via 20 nm scale InAs quantum dot and magnetotunneling spectroscopy of its electronic states , 1997 .

[9] Thornton,et al. Resonant magnetotunneling through individual self-assembled InAs quantum dots. , 1996, Physical review. B, Condensed matter.

[10] Nikolai N. Ledentsov,et al. Quantum dot heterostructures , 1999 .