Abstract
The 1S ortho- and para-exciton of the yellow series in Cu 2O are studied by high resolution spectroscopy. We observe that the 3-fold ortho-exciton ( Γ 5 +-symmetry) is not degenerate. For a general k-direction there are three resonances with line width down to 1 μeV. The splitting is quantitatively explained by taking into account the long range and short range exchange interaction. The group velocity of the quadrupole polariton is directly determined with use of 20 ns pulses with still high spectral resolution (Δ E≈0.1 μeV). Group velocities down to 4×10 4 m/s are quantitatively described by a one-oscillator quadrupole polariton model. The para-exciton ( Γ 2 +-symmetry) is seen in absorption in magnetic fields down to 1 T. In selected crystals it shows a line width of 0.2 μeV.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
