scholarly journals Adiabatic demagnetization of quadrupolar nuclear spins in a rotating frame by use of an rf electric field

1993 ◽  
Vol 47 (6) ◽  
pp. 3213-3219 ◽  
Author(s):  
Hiroshi Hatanaka ◽  
Masahiro Takahama
Keyword(s):  
Electric Field ◽  
Rotating Frame ◽  
Nuclear Spins ◽  
Adiabatic Demagnetization

Adiabatic demagnetization at absolute negative temperature: Generation of quantum correlations

2019 ◽  
Vol 17 (03) ◽  
pp. 1950023
Author(s):  
Gregory B. Furman ◽  
Shaul D. Goren ◽  
Victor M. Meerovich ◽  
Vladimir L. Sokolovsky
Keyword(s):  
Magnetic Field ◽  
Negative Temperature ◽  
Quantum Correlations ◽  
Zero Magnetic Field ◽  
Positive Temperature ◽  
Nuclear Spins ◽  
Adiabatic Demagnetization ◽  
Negative Temperatures ◽  
Classical Correlations ◽  
Quantum And Classical Correlations

In this paper, we study behavior of the correlations, both quantum and classical, under adiabatic demagnetization process in systems of nuclear spins with dipole–dipole interactions in an external magnetic field and in the temperature range including positive and negative temperatures. For a two-spin system, analytical expressions for the quantum and classical correlations are obtained. It is revealed that the field dependences of the quantum and classical correlations at positive and negative temperatures are substantially different. This difference most clearly appears in the case of zero magnetic field: at negative temperature, the measures of quantum correlations tend to the maximum values with a temperature increase. At positive temperature, these quantities tend to zero at a decrease of magnetic field. It is also found that, for the nearest-neighboring spins in the same field, the values of concurrence and discord are larger at negative temperatures than at positive ones.

Refrigeration by adiabatic demagnetization of nuclear spins

1978 ◽  
Vol 31 (1-2) ◽  
pp. 193-222 ◽  
Author(s):  
S. Y. Shen ◽  
J. B. Ketterson ◽  
W. P. Halperin
Keyword(s):  
Nuclear Spins ◽  
Adiabatic Demagnetization

Manifestations of the rotation and gravity of the Earth in spin physics experiments

2016 ◽  
Vol 31 (28n29) ◽  
pp. 1645030 ◽  
Author(s):  
Yuri N. Obukhov ◽  
Alexander J. Silenko ◽  
Oleg V. Teryaev
Keyword(s):  
Electric Field ◽  
Particle Motion ◽  
Earth Rotation ◽  
Reaction Force ◽  
Rotating Frame ◽  
Spin Physics ◽  
Earth Gravity ◽  
The Earth ◽  
Maxwell Electrodynamics ◽  
Physics Experiments

An influence of the rotation and gravity of the Earth on the particle motion and the spin evolution is not negligible and it should be taken into account in spin physics experiments. The Earth rotation brings the Coriolis and centrifugal forces in the lab frame and also manifests in the additional rotation of the spin and in the change of the Maxwell electrodynamics. The change of the Maxwell electrodynamics due to the Earth gravity is much smaller and can be neglected. One of manifestations of the Earth rotation is the Sagnac effect. The electric and magnetic fields acting on the spin in the Earth’s rotating frame coincide with the corresponding fields determined in the inertial frame instantly accompanying a lab. The effective electric field governing the particle motion differs from the electric field in the instantly accompanying frame. Nevertheless, the difference between the conventional Lorentz force and the actual force in the Earth’s rotating frame vanishes on average in accelerators and storage rings due to the beam rotation. The Earth gravity manifests in additional forces acting on particles/nuclei and in additional torques acting on the spin. The additional forces are the Newton-like force and the reaction force provided by a focusing system. The additional torques are caused by the corresponding focusing field and by the geodetic effect. As a result, the Earth gravity leads to the additional spin rotation about the radial axis which may not be negligible in EDM experiments.

Coherent Manipulation of Nuclear Spins in Semiconductors with an Electric Field

2013 ◽  
Vol 6 (3) ◽  
pp. 033002 ◽  
Author(s):  
Masaaki Ono ◽  
Jun Ishihara ◽  
Genki Sato ◽  
Yuzo Ohno ◽  
Hideo Ohno
Keyword(s):  
Electric Field ◽  
Nuclear Spins ◽  
Coherent Manipulation

Adiabatic demagnetization in the rotating frame by non-resonant oscillating field

1974 ◽  
Vol 49 (2) ◽  
pp. 135-136 ◽  
Author(s):  
M. Kunitomo ◽  
H. Hatanaka ◽  
T. Hashi
Keyword(s):  
Rotating Frame ◽  
Adiabatic Demagnetization

Notizen: Cross Polarization in Electron Nuclear Double Resonance by Satisfying the Hartmann-Hahn Condition

1987 ◽  
Vol 42 (12) ◽  
pp. 1456-1457 ◽  
Author(s):  
H Brunner ◽  
R. H. Fritsch ◽  
K. H. Hausser
Keyword(s):  
Magnetic Field ◽  
Time Constant ◽  
Microwave Field ◽  
Double Resonance ◽  
Cross Relaxation ◽  
Rotating Frame ◽  
Cross Polarization ◽  
Nuclear Spins ◽  
Electron Nuclear Double Resonance ◽  
Spin Lock

The polarization of electronic spins S is transferred to nuclear spins I by cross relaxation in an electron nuclear double resonance experiment. The cross relaxation becomes very efficient with a time constant Tcr of about 0.5 microseconds if the Hartmann-Hahn condition is satisfied for electronic spins S spin-lock ed to the microwave field B1,S in the rotating frame and for proton spins / in the static magnetic field B0.

scholarly journals Entanglement of systems of dipolar coupled nuclear spins at the adiabatic demagnetization

2008 ◽  
Vol 21 (2) ◽  
pp. 025601 ◽  
Author(s):  
S I Doronin ◽  
E B Fel’dman ◽  
M M Kucherov ◽  
A N Pyrkov
Keyword(s):  
Nuclear Spins ◽  
Adiabatic Demagnetization

Molecular Rovibronic Symmetries in Electric and Magnetic Fields

1975 ◽  
Vol 53 (19) ◽  
pp. 2210-2220 ◽  
Author(s):  
James K. G. Watson
Keyword(s):  
Magnetic Field ◽  
Magnetic Fields ◽  
Electric Field ◽  
Symmetry Groups ◽  
Nuclear Spins ◽  
Symmetry Classification ◽  
Electric And Magnetic Fields ◽  
Field Symmetry ◽  
Point Groups

The structures of the symmetry groups for the rovibronic levels of a molecule in a homogeneous electric or magnetic field are derived, and the symmetry classification of the levels in terms of the representations and corepresentations of these groups is discussed. Specific results are given for molecules of the point groups C3, C2v, C3v, D2d, and Td in an electric field. Symmetry in combined electric and magnetic fields and the inclusion of nuclear spins are considered briefly.

scholarly journals Rotating-Frame Overhauser Transfer via Long-Lived Coherences

Symmetry ◽  
2021 ◽  
Vol 13 (9) ◽  
pp. 1685
Author(s):  
Florin Teleanu ◽  
Alexandru Topor ◽  
Diana Serafin ◽  
Aude Sadet ◽  
Paul R. Vasos
Keyword(s):  
Spin Dynamics ◽  
Magnetization Transfer ◽  
Protein Structure Determination ◽  
Rotating Frame ◽  
Nuclear Spins ◽  
Correlation Times ◽  
Transfer Rates ◽  
Distance Restraints ◽  
Rotational Correlation Times ◽  
Magnetic Couplings

Solution-state distance restraints for protein structure determination with Ångström-level resolution rely on through-space transfer of magnetization between nuclear spins. Such magnetization transfers, named Overhauser effects, occur via dipolar magnetic couplings. We demonstrate improvements in magnetization transfer using long-lived coherences (LLCs)—singlet-triplet superpositions that are antisymmetric with respect to spin-permutation within pairs of coupled magnetic nuclei—as the magnetization source. Magnetization transfers in the presence of radio-frequency irradiation, known as ‘rotating-frame’ Overhauser effects (ROEs), are predicted by theory to improve by the use of LLCs; calculations are matched by preliminary experiments herein. The LLC-ROE transfers were compared to the transmission of magnetization via classical transverse routes. Long-lived coherences accumulate magnetization on an external third proton, K, with transfer rates that depended on the tumbling regime. I,S →K transfers in the LLC configuration for (I,S) are anticipated to match, and then overcome, the same transfer rates in the classical configuration as the molecular rotational correlation times increase. Experimentally, we measured the LLC-ROE transfer in dipeptide AlaGly between aliphatic protons in different residues K = Ala − Hα and (I,S) = Gly − Hα1,2 over a distance dK,I,S = 2.3 Å. Based on spin dynamics calculations, we anticipate that, for such distances, a superior transfer of magnetization occurs using LLC-ROE compared to classical ROE at correlation times above τC=10 ns. The LLC-ROE effect shows potential for improving structural studies of large proteins and offering constraints of increased precision for high-affinity protein-ligand complexes in slow tumbling in the liquid state.

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