%0 Journal Article %1 Janner2001 %A Janner, A. M. %A Jonkman, H. T. %A Sawatzky, G. A. %D 2001 %J Physical Review B %K 2ND-HARMONIC ABSORPTION; BAND-STRUCTURE; C-60; C60 CUCL; DISPERSION; ENERGY; GENERATION; INTERFACES; SOLID THIN-FILMS; %N 8 %P 085111 %T Second-harmonic generation spectroscopy: A technique for selectively probing excitons %V 63 %X We show that second-harmonic generation (SHG) and sum-frequency generation (SFG) are selective tools for probing excitons. In SHG and SFG measurements performed on C-60 and CuCl films we observe Frenkel and Wannier excitons, respectively. On the other hand, no second-harmonic (sum-frequency) intensity enhancement was observed at energies above the conductivity gap. This is in strong contrast to, for instance, one-photon and two-photon absorption experiments. The selectivity of SHG and SFG for excitons compared to interband transitions can be explained in terms of coherence of the respective excitation processes.

@article{Janner2001, abstract = {We show that second-harmonic generation (SHG) and sum-frequency generation (SFG) are selective tools for probing excitons. In SHG and SFG measurements performed on C-60 and CuCl films we observe Frenkel and Wannier excitons, respectively. On the other hand, no second-harmonic (sum-frequency) intensity enhancement was observed at energies above the conductivity gap. This is in strong contrast to, for instance, one-photon and two-photon absorption experiments. The selectivity of SHG and SFG for excitons compared to interband transitions can be explained in terms of coherence of the respective excitation processes.}, added-at = {2010-01-22T11:58:32.000+0100}, author = {Janner, A. M. and Jonkman, H. T. and Sawatzky, G. A.}, biburl = {https://www.bibsonomy.org/bibtex/26426196c4355fe0dd91832c92b0201d9/myrta}, description = {Second Harmonic generation in semiconductors; excitonic effects}, file = {:home/cfc/myrta/VirtualLibrary/MemoryKernel/PhysRevB.63.085111.pdf:PDF}, interhash = {2212d032aad1a649f0a0c8dcbd0d6bbf}, intrahash = {6426196c4355fe0dd91832c92b0201d9}, journal = {Physical Review B}, keywords = {2ND-HARMONIC ABSORPTION; BAND-STRUCTURE; C-60; C60 CUCL; DISPERSION; ENERGY; GENERATION; INTERFACES; SOLID THIN-FILMS;}, month = {February}, number = 8, owner = {myrta}, pages = 085111, sn = {0163-1829}, tc = {5}, timestamp = {2010-01-22T11:58:33.000+0100}, title = {Second-harmonic generation spectroscopy: A technique for selectively probing excitons}, ut = {ISI:000167203500034}, volume = 63, year = 2001 }