# What Is Particle Spin

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### Optical Isolation Induced By Subwavelength Spinning Particle Via ...

Optical isolation enables nonreciprocal manipulations of light with broad applications in optical communications. Optical isolation by rotating structures has drawn considerable attention due to its magnetic-free nature and unprecedented performance. Conventional rotation-based optical isolation relies on the use of bulky cavities hindering applications in subwavelength photonics. Here, we propose a mechanism of optical isolation by integrating the unique dispersion of a hyperbolic metamaterial with the transverse spin-orbit interaction of evanescent waves. We show that rotation of a subwavelength hyperbolic nanoparticle breaks the time-reversal symmetry and yields two resonant chiral modes that selectively couple to the transverse spin of waveguide modes. Remarkably, the transverse spin-orbit interaction can give rise to unidirectional coupling and more than $95%$ isolation of infrared light at an experimentally feasible rotation speed. Our work fuses the two important fields of optical isolation and photoni Mar 10, 2021 ... Optical isolation induced by subwavelength spinning particle via spin-orbit interaction. Hongkang Shi, Yuqiong Cheng, Zheng Yang, ... [ReadMore..]

### Spin Classification Of Particles

Particles with integer spin are called bosons. Fermions include electrons, protons, neutrons. The wavefunction which describes a collection of fermions must be ... [ReadMore..]

### The Weird Quantum Property Of 'Spin' | Space

Dec 19, 2017 ... For one, the magnitude of a particular particle's spin is fixed. By definition, electrons have a spin equal to 1/2. Other particles might ... [ReadMore..]

### The Quantum Atlas | Spin

It's more about a particle's identity than its merry-go-round motion. It's more about a particle's identity than its merry-go-round motion. Quantum particles have a quirky property called spin, which, as it turns out, has almost ... [ReadMore..]

### New Evidence For Electron's Dual Nature Found In A Quantum Spin Liquid

New experiments conducted at Princeton University provide evidence for a decades-old theory that, in the quantum regime, an electron behaves as if it is made of two particles, one particle that carries its negative charge and the other that gives it a magnet-like property called spin. The Princeton team detected evidence for this theory in materials called quantum spin liquids. May 13, 2021 ... ... is made of two particles, one particle that carries its negative charge and the other that gives it a magnet-like property called spin. [ReadMore..]

### Particle With Spin S= 3/2 In Riemannian Space-time

Equations for 16-component vector-bispinor field, originated from Rarita-Schwinger Lagrangian for spin 3/2 field extended to Riemannian space-time are investigated. Additional general covariant constrains for the field are produced, which for some space-time models greatly simplify original wave equation. Peculiarities in description of the massless spin 3/2 field are specified. In the flat Minkowski space for massless case there exist gauge invariance of the main wave equation, which reduces to possibility to produce a whole class of trivial solutions in the the form of 4-gradient of arbitrary (gauge) bispinor function, Ψ^{0}_{c} = \partial_{c} ψ. Generalization of that property for Riemannian model is performed; it is shown that in general covariant case solutions of the gradient type Ψ^{0}_β = (\nabla_β + Γ_β)Ψexist in space-time regions where the Ricci tensor obeys an identity R_{αβ} - {1 \over 2} R g_{αβ} = 0. Sep 18, 2011 ... Equations for 16-component vector-bispinor field, originated from Rarita-Schwinger Lagrangian for spin 3/2 field extended to Riemannian space- ... [ReadMore..]

### Transverse Spin Forces And Non-equilibrium Particle Dynamics In A ...

Dec 21, 2018 ... Here, its effect is revealed in the inertial motion of a probe particle in a circularly polarized Gaussian trap, in vacuum. Transverse spin ... [ReadMore..]

### What Exactly Is The 'spin' Of Subatomic Particles Such As Electrons ...

Oct 21, 1999 ... "Spin is the total angular momentum, or intrinsic angular momentum, of a body. The spins of elementary particles are analogous to the spins of ... [ReadMore..]

### What Is A Particle? | Quanta Magazine

It has been thought of as many things: a pointlike object, an excitation of a field, a speck of pure math that has cut into reality. But never has physicists’ conception of a particle changed more… Nov 12, 2020 ... This key property is “spin.” At the time of Wigner's work, physicists already knew particles have spin, a kind of intrinsic angular momentum ... [ReadMore..]

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### Q: What Is “spin” In Particle Physics? Why Is It Different From Just ...

Physicist: “Spin” or sometimes “nuclear spin” or “intrinsic spin” is the quantum version of angular momentum.  Unlike regular angular momentum, spin has nothing … Oct 29, 2011 ... The spin of a particle has a very real effect on what happens when it's physically rotated around another, identical particle. When you rotate ... [ReadMore..]

### Why Does The Proton Spin? Physics Holds A Surprising Answer

If you thought it was because it's made of three quarks, you might luck into the right answer, but not for the right reason. Apr 19, 2017 ... (Don't be fooled: no particles are actually, physically spinning, but "spin" is the name we give to this property of intrinsic angular momentum.) ... [ReadMore..]