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HL: Fachverband Halbleiterphysik
HL 71: Focus Session: Tailored Nonlinear Photonics II
HL 71.7: Vortrag
Donnerstag, 19. März 2020, 17:00–17:15, POT 51
Second Harmonic Generation on excitons and magnon-sideband in the antiferromagnet Cr2O3 — •Johannes Mund1, Victor V. Pavlov2, Roman V. Pisarev2, Dmitri R. Yakovlev1,2, and Manfred Bayer1,2 — 1Experimentelle Physik 2, Technische Universität Dortmund, Germany — 2Ioffe Institute, Russian Academy of Sciences, St. Petersburg, Russia
We present results of optical second harmonic generation (SHG) in Cr2O3 on Frenkel excitons formed by 4A1-2E states of Cr3+ ions in the near infrared range 1.7−1.78 eV. As was shown in previous work [1], the electric-dipole SHG is allowed in Cr2O3 due to its particular antiferromagnetic ordering below TN=307.5 K. In addition, it was possible to image the antiferromagnetic domains in a Cr2O3 sample by SHG [2].
We investigated detailed SHG polarization dependencies for linearly and circularly polarized light of the exciton states using femtosecond laser pulses. In magnetic field B, applied parallel and perpendicular to the sample optical c-axis, further information on exciton symmetries and optical selection rules were obtained. Moreover, in our spectra, we succeed for the first time to observe SHG signals on the exciton-magnon-sideband.
[1] M. Fiebig et al. PRL 73, 2127 (1994)
[2] M. Fiebig et al. Appl. Phys. Lett 66, 2906 (1995)