Direct visualization of the spin-orbit angular momentum conversion in optical trapping

2020 ◽  
Author(s):  
Alejandro V. Arzola ◽  
Laura Pérez-García ◽  
Petr Jákl ◽  
Lukáš Chvátal ◽  
Jaime Donlucas ◽  
...  
Keyword(s):  
Angular Momentum ◽  
Optical Trapping ◽  
Spin Orbit ◽  
Direct Visualization

scholarly journals Current-induced spin–orbit torques

2011 ◽  
Vol 369 (1948) ◽  
pp. 3175-3197 ◽  
Author(s):  
Pietro Gambardella ◽  
Ioan Mihai Miron
Keyword(s):  
Angular Momentum ◽  
Exchange Coupling ◽  
Spin Transfer Torque ◽  
Spin Transfer ◽  
Spin Torque ◽  
Inversion Symmetry ◽  
Spin Orbit ◽  
Great Flexibility ◽  
Combined Action ◽  
Proper Material

The ability to reverse the magnetization of nanomagnets by current injection has attracted increased attention ever since the spin-transfer torque mechanism was predicted in 1996. In this paper, we review the basic theoretical and experimental arguments supporting a novel current-induced spin torque mechanism taking place in ferromagnetic (FM) materials. This effect, hereafter named spin–orbit (SO) torque, is produced by the flow of an electric current in a crystalline structure lacking inversion symmetry, which transfers orbital angular momentum from the lattice to the spin system owing to the combined action of SO and exchange coupling. SO torques are found to be prominent in both FM metal and semiconducting systems, allowing for great flexibility in adjusting their orientation and magnitude by proper material engineering. Further directions of research in this field are briefly outlined.

Spin-Orbital Angular Momentum of Light and Its Application

2020 ◽  
Vol 29 (10) ◽  
pp. 28-31
Author(s):  
Teun-Teun KIM
Keyword(s):  
Angular Momentum ◽  
Quantum Entanglement ◽  
Orbital Angular Momentum ◽  
Phase Distribution ◽  
Optical Vortex ◽  
Spin Orbit ◽  
Vortex Beam ◽  
Spin Orbital ◽  
Matter Interaction ◽  
Light Matter Interaction

Like the eletron, the photon carries spin and orbital angular momentum caused by the polarization and the spatial phase distribution of light, respectively. Since the first observation of an optical vortex beam with orbital angular momentum (OAM), the use of an optical vortex beam has led to further studies on the light-matter interaction, the quantum nature of light, and a number of applications. In this article, using a metasurface with geometrical phase, we introduce the fundamental origins and some important applications of light with spin-orbit angular momentum as examples, including optical vortex tweezer and quantum entanglement of the spin-orbital angular momentum.

Phase separation in spin-orbit-angular-momentum coupling Bose–Einstein condensate systems

2020 ◽  
Vol 34 (23) ◽  
pp. 2050241
Author(s):  
Jin Xu ◽  
Jinbin Li
Keyword(s):  
Angular Momentum ◽  
Phase Separation ◽  
Coupling Strength ◽  
Interaction Strength ◽  
Einstein Condensate ◽  
Three Dimensions ◽  
Pitaevskii Equation ◽  
Spin Orbit ◽  
Bose Einstein Condensate ◽  
Bose Einstein

We study the phase separation in three-component spin-orbit-angular-momentum coupled Bose–Einstein condensate with spin-1 in three dimensions. Different types of phase-separation are acquired upon an increase of the coupling strength, magnetic gradient strength, spin-dependent interaction strength and particle number above a critical value. Increasing the value of coupling strength and other related parameters shows distinct behaviors which are produced by repulsion for large strengths of spin-orbit angular-momentum (SOAM) coupling. The present investigation is carried out through a numerical Crank–Nicolson method of the underlying mean-field Gross–Pitaevskii equation.

scholarly journals Angular momentum of light revisited: spin-orbit interactions in free space

2011 ◽  
Author(s):  
Konstantin Y. Bliokh ◽  
Miguel A. Alonso ◽  
Elena A. Ostrovskaya
Keyword(s):  
Angular Momentum ◽  
Free Space ◽  
Spin Orbit ◽  
Spin Orbit Interactions
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