scholarly journals Effect of Noise on the Decoherence of a Central Electron Spin Coupled to an Antiferromagnetic Spin Bath

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
G. C. Fouokeng ◽  
M. Tchoffo ◽  
S. Moussiliou ◽  
J. C. Ngana Kuetche ◽  
Lukong Cornelius Fai ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Electron Spin ◽  
Spin System ◽  
Transition Probability ◽  
Entangled State ◽  
Energy Splitting ◽  
Gaussian Shape ◽  
Autocorrelated Noise ◽  
Low Magnetic Field ◽  
Antiferromagnetic Spin

We analyze the influence of a two-state autocorrelated noise on the decoherence and on the tunneling Landau-Zener (LZ) transitions during a two-level crossing of a central electron spin (CES) coupled to a one dimensional anisotropic-antiferomagnetic spin, driven by a time-dependent global external magnetic field. The energy splitting of the coupled spin system is found through an approach that computes the noise-averaged frequency. At low magnetic field intensity, the decoherence (or entangled state) of a coupled spin system is dominated by the noise intensity. The effects of the magnetic field pulse and the spin gap antiferromagnetic material used suggest to us that they may be used as tools for the direct observation of the tunneling splitting through the LZ transitions in the sudden limit. We found that the dynamical frequencies display basin-like behavior decay with time, with the birth of entanglement, while the LZ transition probability shows Gaussian shape.

Electron spin exchange relaxation of radicals in low magnetic field

2006 ◽  
Vol 104 (10-11) ◽  
pp. 1739-1749 ◽  
Author(s):  
S. R. Shakirov ◽  
P. A. Purtov ◽  
YuA. Grishin ◽  
E. G. Bagryanskaya
Keyword(s):  
Magnetic Field ◽  
Electron Spin ◽  
Spin Exchange ◽  
Low Magnetic Field

scholarly journals Cross-Relaxation Effects in a Ruby L?Band (1440 Mc/s) Maser at Low Magnetic Fields

1961 ◽  
Vol 14 (3) ◽  
pp. 381 ◽  
Author(s):  
GS Bogle ◽  
FF Gardner
Keyword(s):  
Magnetic Field ◽  
Transition Probability ◽  
Cross Relaxation ◽  
Gaussian Shape ◽  
Crystal Axis ◽  
Relaxation Effects ◽  
Low Field ◽  
Field L ◽  
L Band ◽  
The Magnetic Field

The reversals of maser behaviour which occur in ruby at low fields on cooling from 80� to 4 oK are explained in terms of cross-relaxation transitions (resonant interchanges of energy between neighbouring paramagnetic ions). For an angle of 29� between the magnetic field and the crystal axis a cross-relaxation process has been demonstrated which involves groups of three ions and has a transition probability of 700� 100 per second in 0�013% ruby. The profile of the cross-relaxation resonance has a half-width of 190�30 Mcts at half-intensity, and has an approximately Gaussian shape. It should be possible to obtain useful low-field L-band maser action at 4 oK by pumping V41 with the magnetic field nearly perpendicular to the crystal axis, and also at 80 oK using a concentration ten times higher, i.e. 0�13%

Thermodynamic properties of a multiferroic antiferromagnetic spin system: The influence of Dzyaloshinskii Moriya interaction

2019 ◽  
Vol 33 (08) ◽  
pp. 1950051
Author(s):  
Martin Tchoffo ◽  
William Degaulle Waladi Gueagni ◽  
Georges Collince Fouokeng ◽  
Lionel Tenemeza Kenfack ◽  
Lukong Cornelius Fai
Keyword(s):  
Magnetic Field ◽  
Heat Capacity ◽  
Thermodynamic Properties ◽  
Specific Heat ◽  
Specific Heat Capacity ◽  
Spin System ◽  
Statistical Physics ◽  
Wave Theory ◽  
Dm Interaction ◽  
Antiferromagnetic Spin

In this paper, we address the influence of Dzyaloshinskii Moriya (DM) interaction on the thermodynamic properties of a multiferroic antiferromagnetic spin system using the spin wave theory (SWT) as a diagonalization method which, associated to the statistical physics, helps to evaluate the statistical sum. The basic factors in thermodynamics, such as the Boltzmann entropy and the specific heat capacity at thermal equilibrium, are obtained. Analyzing the numerical results, it follows that the DM interaction is the best candidate that can help to maintain in long time the system in its coherent state. Furthermore, we find that the influence of the DM interaction is more accentuated at low-temperature and that it enables the system to release heat energy. On the other hand, the fact that the specific heat capacity tends to the constant clearly shows that the system obeys the Dulong–Petit law. In addition, our results also show that for high magnetic field (greater than B[Formula: see text]=[Formula: see text]30 Tesla), the magnetic field dependence of both entropy and specific heat shows a peak-like behavior and that the DM interaction raises the corresponding critical magnetic field but lowers the peak amplitude. It follows that the spin-flop transition occurs in the system and that the strong magnetic field withdraw the antiferromagnetic phase. Overall, we find that the DM interaction is a promising candidate for the control of our system.

Electron spin redistribution in a Kondo quantum dot in the low-magnetic-field regime

2004 ◽  
Vol 22 (1-3) ◽  
pp. 538-541
Author(s):  
W.G. van der Wiel ◽  
M. Stopa ◽  
S. De Franceschi ◽  
L.P. Kouwenhoven ◽  
S. Tarucha
Keyword(s):  
Magnetic Field ◽  
Quantum Dot ◽  
Electron Spin ◽  
Low Magnetic Field

HYMU 80

Alloy Digest ◽  
1971 ◽  
Vol 20 (10) ◽  
Keyword(s):  
Magnetic Field ◽  
Fracture Toughness ◽  
Corrosion Resistance ◽  
Heat Treating ◽  
Initial Permeability ◽  
Nickel Iron ◽  
Technology Corporation ◽  
Carpenter Technology Corporation ◽  
Low Magnetic Field ◽  
Maximum Permeability

Abstract Carpenter HYMU 80 is an unoriented 80% nickel-iron-molybdenum alloy which offers extremely high initial permeability and maximum permeability with minimum hysteresis loss at low magnetic field strengths. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as fracture toughness. It also includes information on corrosion resistance as well as forming, heat treating, machining, and joining. Filing Code: Ni-5. Producer or source: Carpenter Technology Corporation. Originally published May 1953, revised October 1971.

Low magnetic field spin flops in giant magnetoresistance multilayers

1995 ◽  
Vol 148 (1-2) ◽  
pp. 329-330 ◽  
Author(s):  
H. Kano ◽  
A. Okabe ◽  
K. Kagawa ◽  
A. Suzuki ◽  
T. Yaoi ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Giant Magnetoresistance ◽  
Low Magnetic Field

scholarly journals TRANSPORT PROPERTIES OF 2D ELECTRON GAS IN AN n-InGaAs/GaAs DQW IN A VICINITY OF LOW MAGNETIC-FIELD-INDUCED HALL INSULATOR–QUANTUM HALL LIQUID TRANSITION

2007 ◽  
Vol 06 (03n04) ◽  
pp. 173-177
Author(s):  
YU. G. ARAPOV ◽  
S. V. GUDINA ◽  
G. I. HARUS ◽  
V. N. NEVEROV ◽  
N. G. SHELUSHININA ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Electron Gas ◽  
Quantum Hall ◽  
Zero Magnetic Field ◽  
Double Quantum ◽  
Ballistic Regime ◽  
2D Electron Gas ◽  
Double Quantum Well ◽  
Liquid Transition ◽  
Low Magnetic Field

The resistivity (ρ) of low mobility dilute 2D electron gas in an n- InGaAs / GaAs double quantum well (DQW) exhibits the monotonic "insulating-like" temperature dependence (dρ/dT < 0) at T = 1.8–70 K in zero magnetic field. This temperature interval corresponds to a ballistic regime (kBTτ/ħ > 0.1–3.5) for our samples, and the electron density is on an "insulating" side of the so-called B = 0 2D metal–insulator transition. We show that the observed features of localization and Landau quantization in a vicinity of the low magnetic-field-induced insulator–quantum Hall liquid transition is due to the σxy(T) anomalous T-dependence.

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