Spin projection chromatography
نویسندگان
چکیده
We formulate the many-body spin dynamics at high temperature within the non-equilibrium Keldysh formalism. For the simplest XY interaction, analytical expressions in terms of the one particle solutions are obtained for linear and ring configurations. For small rings of even spin number, the group velocities of excitations depend on the parity of the total spin projection. This should enable a dynamical filtering of spin projections with a given parity i.e., a spin projection chromatography. 2003 Elsevier B.V. All rights reserved.
منابع مشابه
Vortex Dynamics in Classical Non–Abelian Spin Models
We discuss the abelian vortex dynamics in the abelian projection approach to non-abelian spin models. We show numerically that in the three-dimensional SU(2) spin model in the Maximal Abelian projection the abelian off-diagonal vortices are not responsible for the phase transition contrary to the diagonal vortices. A generalization of the abelian projection approach to SU(N) spin models is brie...
متن کاملVortex Dynamics in Non–Abelian Spin Models
We discuss the abelian vortex dynamics in the abelian projection approach to non-abelian spin models. We show numerically that in the three-dimensional SU(2) spin model in the Maximal Abelian projection the abelian off-diagonal vortices are not responsible for the phase transition contrary to the diagonal vortices. A generalization of the abelian projection approach to SU(N) spin models is brie...
متن کاملSome reasons not to use spin projected density functional theory
Spin unrestricted calculations using density functional theory can yield wave functions with spin contamination. In conventional post Hartree–Fock calculations ~such as Mo”ller–Plesset perturbation theory!, spin projection can ameliorate some of the problems caused by spin contamination. However, spin projection can seriously degrade the quality of potential energy surfaces calculated by densit...
متن کاملInfluence of Spin Projection Noise on the Sensitivity of Cs Atom Magne- tometer
This article introduces the influence of laser’s spin projection noise on the sensitivity of Cs atom magnetometer and concludes that the theoretical value of the spin projection noise is about1.23fT·Hz under the optimization conditions of the atom steam chest, namely temperature as 105°C, volume as 0.0785cm and molecular density as 1.7×10 cm. Such research has provided us with the necessary bas...
متن کاملSpin projection and spin current density within relativistic electronic-transport calculations
A spin projection scheme is presented which allows the decomposition of the electric conductivity into two different spin channels within fully relativistic ab initio transport calculations that account for the impact of spin-orbit coupling. This is demonstrated by calculations of the spin-resolved conductivity of Fe1−xCrx and Co1−xPtx disordered alloys on the basis of the corresponding Kubo-Gr...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 2004