Regensburg 2004 – wissenschaftliches Programm

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HL: Halbleiterphysik

HL 44: Poster II

HL 44.34: Poster

Donnerstag, 11. März 2004, 16:30–19:00, Poster A

Experimental indications for coherent coupling of two quantum dots — •Gerhard Ortner¹, M. Bayer¹, A.V. Larionov¹, I. Yugova¹, G. Baldassarri H.v.H.¹, P. Hawrylak², S. Fafard², and Z. Wasilewski² — ¹Experimentelle Physik II, Otto-Hahn-Str. 4, 44221 Dortmund, Germany — ²Institute of Microstructual Sciences, National Research Council, Ottawa, K1AOR6, Canada

Semiconductor Quantum Dots (QDs) have attracted considerable interest recently because of its potential for possible applications in quantum information processing. For this purpose a quantum gate which entangles the states of two quantum bits as the essential block of a quantum processor is needed.

A pair of vertically aligned QDs has been suggested as a promising candidate for an optically driven quantum gate. Recently the coherent coupling of the exciton states in a single QD molecule due to tunneling of carriers has been demonstrated in various experiments. These are: anti-crossings in the fine structure of excitons in single QD molecules and diamagnetic shifts in Faraday- and Voigt-configuration which depend systematically on barrier width between the two dots. Similar systematic dependences have been found for spin-splitting and biexciton properties in single QD molecules.