Mass splitting of vector meson and spontaneous spin polarization under rotation

The first step of electrochemical oxidation of 2-phenyl- and 2-(4-tolyl)-1,3,4,7-tetramethylisoindoles in anhydrous acetonitrile produces relatively stable cationradicals which have been studied by means of EPR spectroscopy using the method of internal electrochemical generation of radicals under reduced temperature. The same electrochemical behaviour of the both studied derivatives and identical EPR spectra of their cationradicals can be explained within the Huckel MO method. The largest contribution to the magnitude of splitting constant of nitrogen nucleus is due to π-σ-spin polarization of C-N bonds caused by high spin abundance of pz-AO of carbon atoms. Half-life of decomposition of the studied cationradicals is 4 min at -30°C.

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Dynamical Nuclear Polarization

10.1093/oso/9780198807308.003.0005 ◽

2018 ◽

Author(s):

M. M. Glazov

Keyword(s):

Spin Polarization ◽

Nuclear Spin ◽

Nuclear Polarization ◽

Magnetic Moments ◽

Nonlinear Effects ◽

Many Body ◽

Nuclear Spin Polarization ◽

Optical Resonances ◽

Dynamical Nuclear Polarization ◽

Temperature Concept

The transfer of nonequilibrium spin polarization between the electron and nuclear subsystems is studied in detail. Usually, a thermal orientation of nuclei in magnetic field is negligible due to their small magnetic moments, but if electron spins are optically oriented, efficient nuclear spin polarization can occur. The microscopic approach to the dynamical nuclear polarization effect based on the kinetic equation method, along with a phenomenological but very powerful description of dynamical nuclear polarization in terms of the nuclear spin temperature concept is given. In this way, one can account for the interaction between neighbouring nuclei without solving a complex many-body problem. The hyperfine interaction also induces the feedback of polarized nuclei on the electron spin system giving rise to a number of nonlinear effects: bistability of nuclear spin polarization and anomalous Hanle effect, dragging and locking of optical resonances in quantum dots. Theory is illustrated by experimental data on dynamical nuclear polarization.

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Vector Meson Production in Semi‐Inclusive π ‐ p Interactions

10.1063/1.2947389 ◽

1974 ◽

Author(s):

A. Levy ◽

D. Brick ◽

M. Hodous ◽

R. Hulsizer ◽

V. Kistiakowsky ◽

...

Keyword(s):

Vector Meson ◽

Meson Production ◽

Vector Meson Production

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Spin Polarization in Normal Photoemission by Linearly Polarized Light from Non-Magnetic (110) Surfaces

EPL (Europhysics Letters) ◽

10.1209/0295-5075/28/8/012 ◽

1994 ◽

Vol 28 (8) ◽

pp. 609-614 ◽

Cited By ~ 27

Author(s):

J Henk ◽

R Feder

Keyword(s):

Spin Polarization ◽

Polarized Light ◽

Linearly Polarized

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Xenon-1T excess as a possible signal of a sub-GeV hidden sector dark matter

Journal of High Energy Physics ◽

10.1007/jhep02(2021)229 ◽

2021 ◽

Vol 2021 (2) ◽

Author(s):

Amin Aboubrahim ◽

Michael Klasen ◽

Pran Nath

Keyword(s):

Dark Matter ◽

Particle Physics ◽

Small Mass ◽

Big Bang ◽

Mass Splitting ◽

Recoil Energy ◽

Dirac Fermions ◽

Dark Sector ◽

Dark Photon ◽

Physics Model

Abstract We present a particle physics model to explain the observed enhancement in the Xenon-1T data at an electron recoil energy of 2.5 keV. The model is based on a U(1) extension of the Standard Model where the dark sector consists of two essentially mass degenerate Dirac fermions in the sub-GeV region with a small mass splitting interacting with a dark photon. The dark photon is unstable and decays before the big bang nucleosynthesis, which leads to the dark matter constituted of two essentially mass degenerate Dirac fermions. The Xenon-1T excess is computed via the inelastic exothermic scattering of the heavier dark fermion from a bound electron in xenon to the lighter dark fermion producing the observed excess events in the recoil electron energy. The model can be tested with further data from Xenon-1T and in future experiments such as SuperCDMS.

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Room-temperature electron spin polarization exceeding 90% in an opto-spintronic semiconductor nanostructure via remote spin filtering

Nature Photonics ◽

10.1038/s41566-021-00786-y ◽

2021 ◽

Author(s):

Yuqing Huang ◽

Ville Polojärvi ◽

Satoshi Hiura ◽

Pontus Höjer ◽

Arto Aho ◽

...

Keyword(s):

Spin Polarization ◽

Electron Spin ◽

Room Temperature ◽

Electron Spin Polarization ◽

Semiconductor Nanostructure ◽

Temperature Electron ◽

Spin Filtering

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Topological isoconductance signatures in Majorana nanowires

Scientific Reports ◽

10.1038/s41598-021-96415-3 ◽

2021 ◽

Vol 11 (1) ◽

Author(s):

L. S. Ricco ◽

J. E. Sanches ◽

Y. Marques ◽

M. de Souza ◽

M. S. Figueira ◽

...

Keyword(s):

Quantum Dot ◽

Transport Properties ◽

Spin Polarization ◽

Bound States ◽

Spin Asymmetry ◽

Experimental Protocol ◽

Zero Bias ◽

Topological Superconductor ◽

Hybrid Device ◽

Majorana Bound States

AbstractWe consider transport properties of a hybrid device composed by a quantum dot placed between normal and superconducting reservoirs, and coupled to a Majorana nanowire: a topological superconducting segment hosting Majorana bound states (MBSs) at the opposite ends. It is demonstrated that if highly nonlocal and nonoverlapping MBSs are formed in the system, the zero-bias Andreev conductance through the dot exhibits characteristic isoconductance profiles with the shape depending on the spin asymmetry of the coupling between the dot and the topological superconductor. Otherwise, for overlapping MBSs with less degree of nonlocality, the conductance is insensitive to the spin polarization and the isoconductance signatures disappear. This allows to propose an alternative experimental protocol for probing the nonlocality of the MBSs in Majorana nanowires.

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