Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2011-08-18
Physics
Condensed Matter
Strongly Correlated Electrons
10 Pages, 6 Figures, Submitted to PRB
Scientific paper
Motivated by the lack of an obvious spectroscopic probe to investigate non-conventional order such as quadrupolar orders in spin S>1/2 systems, we present a theoretical approach to inelastic light scattering for spin-1 quantum magnets in the context of a two-band Hubbard model. In contrast to the S=1/2 case, where the only type of local excited state is a doubly occupied state of energy $U$, several local excited states with occupation up to 4 electrons are present. As a consequence, we show that two distinct resonating scattering regimes can be accessed depending on the incident photon energy. For $\hbar\omega_{in}\lesssim U$, the standard Loudon-Fleury operator remains the leading term of the expansion as in the spin-1/2 case. For $\hbar\omega_{in}\lesssim4U$, a second resonant regime is found with a leading term that takes the form of a biquadratic coupling $\sim({\bf S}_{i}\cdot{\bf S}_{j)^{2}$. Consequences for the Raman spectra of S=1 magnets with magnetic or quadrupolar order are discussed. Raman scattering appears to be a powerful probe of quadrupolar order.
Michaud Frédéric
Mila Frédéric
Vernay François
No associations
LandOfFree
Theory of inelastic light scattering in spin-1 systems: resonant regimes and detection of quadrupolar order does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Theory of inelastic light scattering in spin-1 systems: resonant regimes and detection of quadrupolar order, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Theory of inelastic light scattering in spin-1 systems: resonant regimes and detection of quadrupolar order will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-180900