scholarly journals Transverse Spin and Spin-Orbit Coupling in Silicon Waveguides

2016 ◽  
Vol 28 (14) ◽  
pp. 1561-1564 ◽  
Author(s):  
Alba Espinosa-Soria ◽  
Alejandro Martinez
Keyword(s):  
Orbit Coupling ◽  
Transverse Spin ◽  
Spin Orbit Coupling ◽  
Spin Orbit ◽  
Silicon Waveguides

scholarly journals Spin-orbit coupling affecting the evolution of transverse spin

2019 ◽  
Vol 1 (3) ◽  
Author(s):  
Jörg S. Eismann ◽  
Peter Banzer ◽  
Martin Neugebauer
Keyword(s):  
Orbit Coupling ◽  
Transverse Spin ◽  
Spin Orbit Coupling ◽  
Spin Orbit

Spin Relaxation Times of Donor Centers Associated with Lithium in Monoisotopic 28 Si

2015 ◽  
Vol 242 ◽  
pp. 322-326
Author(s):  
Alexander A. Ezhevskii ◽  
Alexandra P. Detochenko ◽  
Sergey A. Popkov ◽  
Anton A. Konakov ◽  
Andrey V. Soukhorukov ◽  
...  
Keyword(s):  
Spin Relaxation ◽  
Continuous Wave ◽  
Coupling Parameter ◽  
Relaxation Times ◽  
Lattice Relaxation ◽  
Orbit Coupling ◽  
Spin Lattice Relaxation ◽  
Transverse Spin ◽  
Spin Orbit Coupling ◽  
Spin Orbit

We report a detailed study of electron longitudinal and transverse spin relaxation times for Li donors in monoisotopic 28Si over the temperature range 4–20 K using continuous wave and pulsed electron paramagnetic resonance. Comparison of the obtained spin-lattice relaxation times for the states of the isolated donor center and lithium complex LiO showed that due to the presence of orbital degeneracy, relaxation is faster for single lithium than for the LiO complexes with the nondegenerate ground state. For the isolated lithium center in silicon the relaxation is well described by Blume-Orbach process, with the parameters of the spin-orbit coupling ~ 1·10-6 meV compare to Orbach process for LiO complex with spin-orbit coupling parameter ~ 1.5·10-2 meV.

scholarly journals Observation of chiral surface excitons in a topological insulator Bi2Se3

2019 ◽  
Vol 116 (10) ◽  
pp. 4006-4011 ◽  
Author(s):  
H.-H. Kung ◽  
A. P. Goyal ◽  
D. L. Maslov ◽  
X. Wang ◽  
A. Lee ◽  
...  
Keyword(s):  
Polarized Light ◽  
Orbit Coupling ◽  
Experimental Investigations ◽  
Composite Particles ◽  
Spin Orbit Coupling ◽  
Spin Orbit ◽  
Excitation Energies ◽  
Circularly Polarized Light ◽  
Pl Emission ◽  
Strong Spin

The protected electron states at the boundaries or on the surfaces of topological insulators (TIs) have been the subject of intense theoretical and experimental investigations. Such states are enforced by very strong spin–orbit interaction in solids composed of heavy elements. Here, we study the composite particles—chiral excitons—formed by the Coulomb attraction between electrons and holes residing on the surface of an archetypical 3D TI,Bi2Se3. Photoluminescence (PL) emission arising due to recombination of excitons in conventional semiconductors is usually unpolarized because of scattering by phonons and other degrees of freedom during exciton thermalization. On the contrary, we observe almost perfectly polarization-preserving PL emission from chiral excitons. We demonstrate that the chiral excitons can be optically oriented with circularly polarized light in a broad range of excitation energies, even when the latter deviate from the (apparent) optical band gap by hundreds of millielectronvolts, and that the orientation remains preserved even at room temperature. Based on the dependences of the PL spectra on the energy and polarization of incident photons, we propose that chiral excitons are made from massive holes and massless (Dirac) electrons, both with chiral spin textures enforced by strong spin–orbit coupling. A theoretical model based on this proposal describes quantitatively the experimental observations. The optical orientation of composite particles, the chiral excitons, emerges as a general result of strong spin–orbit coupling in a 2D electron system. Our findings can potentially expand applications of TIs in photonics and optoelectronics.

Spin–orbit coupling driven novel magnetism in d 5 6H-perovskite iridates Ba3IrTi2O9 and Ba3TiIr2O9

2019 ◽  
Vol 31 (18) ◽  
pp. 185802 ◽  
Author(s):  
Sayantika Bhowal ◽  
Shreemoyee Ganguly ◽  
Indra Dasgupta
Keyword(s):  
Orbit Coupling ◽  
Spin Orbit Coupling ◽  
Spin Orbit
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