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Your search keyword '"SPIN polarization"' showing total 2 results
Start Over Descriptor "SPIN polarization" Topic condensed matter Topic condensed matter physics Publisher american physical society
2 results on '"SPIN polarization"'

1. Anisotropy of the molecular magnet V15 spin Hamiltonian detected by high-field electron spin resonance.

Author

Martens, M., van Tol, J., Dalal, N. S., Bertaina, S., Barbara, B., Tsukerblat, B., Müller, A., Garai, S., Miyashita, S., and Chiorescu, I.

Subjects
*ANISOTROPY, *ELECTRON spin, *PARTICLE spin, *ELECTRON spin polarization, *SPIN polarization, *CONDENSED matter, *CONDENSED matter physics
Abstract

The molecular compound K6 [V15IVAs6IIIO42(H2O)] .8H2O , in short V15, has shown important quantum effects such as coherent spin oscillations. The details of the spin quantum dynamics depend on the exact form of the spin Hamiltonian. In this study, we present a precise analysis of the intramolecular interactions in V15. To that purpose, we performed high-field electron spin resonance measurements at 120 GHz and extracted the resonance fields as a function of crystal orientation and temperature. The data are compared against simulations using exact diagonalization to obtain the parameters of the molecular spin Hamiltonian. [ABSTRACT FROM AUTHOR]

Published
2014
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2. Polarized interacting exciton gas in quantum wells and bulk semiconductors

Author

Carlos Tejedor, Joaquín Fernández-Rossier, Luis Viña, L. Muñoz, Grupo de Nanofísica, and Universidad de Alicante. Departamento de Física Aplicada

Subjects
Physics, Condensed Matter::Quantum Gases, Bulk semiconductors, Spin polarization, Condensed matter physics, Física de la Materia Condensada, Condensed Matter::Other, Exciton, Energy level splitting, Binding energy, Condensed Matter (cond-mat), Spin polarized exciton gases, FOS: Physical sciences, Condensed Matter, Condensed Matter::Mesoscopic Systems and Quantum Hall Effect, Condensed Matter::Materials Science, Quantum wells, Mean field theory, Exciton binding energies, Excitation, Quantum well, Biexciton
Abstract

We develop a theory to calculate exciton binding energies of both two- and three-dimensional spin polarized exciton gases within a mean field approach. Our method allows the analysis of recent experiments showing the importance of the polarization and intensity of the excitation light on the exciton luminescence of GaAs quantum wells. We study the breaking of the spin degeneracy observed at high exciton density $(5 \ \ 10^{10} cm ^2)$. Energy level splitting betwen spin +1 and spin -1 is shown to be due to many-body inter-excitonic exchange while the spin relaxation time is controlled by intra-exciton exchange., Comment: Revtex, 4 figures sent by fax upon request by e-mail

Published
1996

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