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