Theory of spin-anisotropic electron-electron interactions in quasi-one-dimensional metals
Theory of spin-anisotropic electron-electron interactions in quasi-one-dimensional metals
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准一维金属中自旋各向异性电子-电子相互作用理论
DOI:
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发表时间:
1988
期刊:
影响因子:
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通讯作者:
H. Schulz
中科院分区:
文献类型:
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作者:
T. Giamarchi;H. Schulz
We construct a theoretical model for one-dimensional conductors taking into account the effects of spin-dependent interactions due to spin-orbit or electronic dipole-dipole couplings. We show that a new type of interaction which does not conserve the z-component of the spin is generated, and that in the presence of time-reversal and inversion symmetry four different coupling constants are necessary to describe the most general case. The spin-dependence of the interactions is computed for spin-orbit and dipolar coupling. The use of bosonization and a renormalization group calculation allow us to obtain the correlation functions and the zero-temperature phase diagram of a strictly one-dimensional system. There is a gap in the spin excitations in the whole phase diagram which leads to fully anisotropic spin-density wave phases. The behaviour under a magnetic field is studied and we find a spin-flop transition. In order to describe quasi-one-dimensional systems we introduce an effective interchain coupling and treat it in the mean-field approximation. The phase diagram is qualitatively different in the case Construction d'un modele qui prend en compte les interactions dues au couplage spin-orbite et les interactions dipole-dipole entre electrons, ce qui induit un nouveau type d'interaction qui ne conserve pas la composante z du spin et qui necessite quatre constantes differentes dans le cas le plus general s'il existe une symetrie par renversement du temps et une symetrie d'espace. Emploi de la bosonisation et d'un calcul de renormalisation pour obtenir les fonctions de correlation et le diagramme de phase du systeme a temperature nulle. Observation de phases ondes de densite de spin totalement anisotropes, d'une transition de type spin-flop sous champ magnetique. Introduction d'un couplage interchaines, traite a l'approximation du champ moyen. Obtention de diagrammes de phases tres differents suivant que les anisotropies sont faibles ou fortes