19 citations · 33 across the 2 of their papers we have counts for
4 papers
Two-magnon Raman scattering in spin-ladder geometries and the ratio of rung and leg exchange constants
P. J. Freitas, R. R. P. Singh
We discuss ways in which the ratio of exchange constants along the rungs and legs of a spin-ladder material influences the two-magnon Raman scattering spectra and hence can be dete…
Two-magnon Raman scattering in insulating cuprates: Modifications of the effective Raman operator
P. J. Freitas, R. R. P. Singh
Calculations of Raman scattering intensities in spin 1/2 square-lattice Heisenberg model, using the Fleury-Loudon-Elliott theory, have so far been unable to describe the broad line…
A new paradigm for two-dimensional spin-liquids
R. R. P. Singh, O. A. Starykh, P. J. Freitas
Motivated by the geometry of the materials Na_2 Ti_2 As_2 O and Na_2 Ti_2 Sb_2 O, we study a square-lattice Heisenberg antiferromagnet with spins located at the bond-centers. The l…
Connections Between Special Relativity, Charge Conservation, and Quantum Mechanics
Paul J. Freitas
Examination of the Einstein energy-momentum relationship suggests that simple unbound forms of matter exist in a four-dimensional Euclidean space. Position, momentum, velocity, and…