@conference {288, title = {Global Picosecond Structural Dynamics of Orange Carotenoid Protein in Photo/Chemical Activated Signaling States}, booktitle = {APS 2017 S4.002}, year = {2017}, month = {03/2017}, url = {http://meetings.aps.org/link/BAPS.2017.MAR.S4.2}, author = {Deng, Y. and Xu, M. and Liu, H. and Blankenship, R. and Markelz, A.} } @article {269, title = {GIANT 3RD-ORDER NONLINEAR SUSCEPTIBILITIES FOR INPLANE FAR-INFRARED EXCITATION OF SINGLE INAS QUANTUM-WELLS}, journal = {Solid-State Electronics}, volume = {37}, number = {4-6}, year = {1994}, note = {Sherwin, Mark S/Q-4762-2017
Sherwin, Mark S/0000-0002-3869-1893; Markelz, Andrea/0000-0003-0443-4319
6th International Conference on Modulated Semiconductor Structures
Aug 23-27, 1993
Garmisch partenkir, germany
Tech univ munchen, walter schottky inst
9}, month = {Apr-Jun}, pages = {1243-1245}, abstract = {

Third-order, free-carrier nonlinear susceptibilities, chi(3), have been measured between 19 and 23 cm-1 for three InAs/AlSb quantum wells with sheet densities between 2.5 x 10(12) cm-2 and 8 x 10(12) cm-2. We find that these wells are strongly nonlinear at far-infrared frequencies: odd harmonics ninth order have been observed at high incident intensities, and the peak value of chi(3) reaches approximately 1 esu. This is several orders of magnitude larger than previously reported values for chi(3) in bulk n-GaAs (10(-4) esu)[1] and in polyacetylene (10(-7) esu)[2]. The large magnitude of chi(3) is attributed to the high carrier density in the InAs wells, and to the strong non-parabolicity of the conduction band in InAs. However, the free-carrier chi(3) for bulk InAs predicts a density-dependence different from that observed, and the measured decrease in chi(3) with increasing intensity indicates non-perturbative response. We find that the anisotropy of chi(3) displays the expected 4-fold symmetry.

}, isbn = {0038-1101}, doi = {10.1016/0038-1101(94)90399-9}, author = {Markelz, A. G. and Gwinn, E. G. and Sherwin, M. S. and Nguyen, C. and Kroemer, H.} }