نتایج جستجو برای: spin fluctuation

تعداد نتایج: 148389  

Journal: :Physical review letters 2001
G Santi S B Dugdale T Jarlborg

The recent discovery of superconductivity coexisting with weak itinerant ferromagnetism in the d-electron intermetallic compound ZrZn2 strongly suggests spin-fluctuation mediated superconductivity. Ab initio electronic structure calculations of the Fermi surface and generalized susceptibilities are performed to investigate the viability of longitudinal spin-fluctuation-induced spin-triplet supe...

Journal: :Physical review letters 2006
Wei Ren Zhenhua Qiao Jian Wang Qingfeng Sun Hong Guo

We report a theoretical investigation on spin-Hall conductance fluctuation of disordered four-terminal devices in the presence of Rashba or/and Dresselhaus spin-orbital interactions in two dimensions. As a function of disorder, the spin-Hall conductance GsH shows ballistic, diffusive, and insulating transport regimes. For given spin-orbit interactions, a universal spin-Hall conductance fluctuat...

Journal: :Physical Review Letters 2004

1999
David H. Lyth

Using the equations recently presented by Kallosh et. al. (hep-th/9907124) and Giudice et. al. (hep-ph/9907510), we estimate the abundance of gravitinos created from the vacuum, in ‘new’ inflation models for which global supersymmetry is a good approximation. Gravitinos with helicity 1/2 are produced abundantly just after inflation, when their effective mass rises sharply, and even more abundan...

Journal: :Physical review letters 1996
Sigl

Extrapolation of perturbative nucleon spin fluctuation rates seems to suggest a strong suppression of weak interactions in supernova cores. We derive a new sum rule for the dynamical spin-density structure function which relates the spin fluctuation rate to the average nuclear interaction energy. For a bremsstrahlung like structure function profile we show that instead of strongly decreasing, t...

2016
Vivek Mishra Douglas J. Scalapino Thomas A. Maier

Observations of robust superconductivity in some of the iron based superconductors in the vicinity of a Lifshitz point where a spin density wave instability is suppressed as the hole band drops below the Fermi energy raise questions for spin-fluctuation theories. Here we discuss spin-fluctuation pairing for a bilayer Hubbard model, which goes through such a Lifshitz transition. We find s± pairi...

2002
I. A. Merkulov

We have studied theoretically the electron spin relaxation in semiconductor quantum dots via interaction with nuclear spins. The relaxation is shown to be determined by three processes: (i) – the precession of the electron spin in the hyperfine field of the frozen fluctuation of the nuclear spins; (ii) – the precession of the nuclear spins in the hyperfine field of the electron; and (iii) – the...

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