Ordering instability of weakly interacting electrons in a dirty metal

Article

关键词: INSULATOR-TRANSITION;    MAGNETIC-FIELD;    2 DIMENSIONS;    SYSTEMS;    FERROMAGNETS;    FLUCTUATIONS;    TEMPERATURE;    SILICON;    LAYERS;    GAS;   

DOI  :  10.1103/PhysRevB.68.104423

来源: SCIE

【 摘 要 】

In a dirty metal, electron-electron interactions in the spin-triplet channel lead to singular corrections to a variety of physical quantities. We show that these singularities herald the emergence of ferromagnetism. We calculate the effective action for the magnetic moment of weakly interacting electrons in a dirty metal and show that a state with finite ferromagnetic moment minimizes this effective action. The saddle-point approximation is exact in an appropriate large-N limit. We discuss the physics of the ferromagnetic state with particular regard to thermal fluctuations and localization effects.

【 授权许可】

Free