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Proceedings Paper

Probing many particle correlations in semiconductor quantum wells using double-quantum-coherence signal
Author(s): Lijun Yang; Shaul Mukamel
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Paper Abstract

Multidimensional analysis of coherent signals is commonly used in nuclear magnetic resonance to study correlations among spins. These techniques were recently extended to the femtosecond regime and applied to chemical, biological and semiconductor systems. In this work, we apply a two-dimensional correlation spectroscopy technique which employs double-quantum-coherence to investigate many-body effects in a semiconductor quantum well. The signal is detected along the direction k1+ k2- k3, where k1, k2 and k3 are the pulse wave vectors in chronological order. We show that this signal is particularly sensitive to many-body correlations which are missed by time-dependent Hartree-Fock approximation. The correlation energy of two-exciton can be probed with a very high resolution arising from a twodimensional correlation spectrum, where two-exciton couplings spread the cross peaks along both axes of the 2D spectrum to create a characteristic highly resolved pattern. This level of detail is not available from conventional onedimensional four-wave mixing or other two-dimensional correlation spectroscopy signals such as the photo echo (-k1+ k2+ k3).

Paper Details

Date Published: 1 March 2010
PDF: 9 pages
Proc. SPIE 7600, Ultrafast Phenomena in Semiconductors and Nanostructure Materials XIV, 76001G (1 March 2010); doi: 10.1117/12.840993
Show Author Affiliations
Lijun Yang, Univ. of Califorina, Irvine (United States)
Shaul Mukamel, Univ. of Califorina, Irvine (United States)

Published in SPIE Proceedings Vol. 7600:
Ultrafast Phenomena in Semiconductors and Nanostructure Materials XIV
Jin-Joo Song; Kong-Thon Tsen; Markus Betz; Abdulhakem Y. Elezzabi, Editor(s)

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