Tuning of spin-orbit coupling in metal-free conjugated polymers by structural conformation

2020 ◽  
Vol 4 (8) ◽  
Author(s):  
Eric Vetter ◽  
Ian VonWald ◽  
Shijia Yang ◽  
Liang Yan ◽  
Sanaz Koohfar ◽  
...  
2020 ◽  
Vol 22 (20) ◽  
pp. 11663-11670
Author(s):  
Xianmin Zhang ◽  
Junwei Tong ◽  
Liuxia Ruan ◽  
Xiannian Yao ◽  
Lianqun Zhou ◽  
...  

Spin–orbit coupling has been regarded as the core interaction to determine the efficiency of spin conserved transport in semiconductor spintronics. Here, we show the spin filter effect should be responsible for the magnetoresistance of H2Pc device.


Author(s):  
Ramin Ansari ◽  
Daniel Hashemi ◽  
John Kieffer

The enhanced spin-orbit coupling necessary for phosphorescence is thought to be due to the halogen bonding that is present in the all-organic crystalline systems.1 To elucidate the underlying mechanism, the...


2013 ◽  
Vol 3 (1) ◽  
Author(s):  
C.-X. Sheng ◽  
S. Singh ◽  
A. Gambetta ◽  
T. Drori ◽  
M. Tong ◽  
...  

2019 ◽  
Vol 116 (10) ◽  
pp. 4006-4011 ◽  
Author(s):  
H.-H. Kung ◽  
A. P. Goyal ◽  
D. L. Maslov ◽  
X. Wang ◽  
A. Lee ◽  
...  

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.


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