Magnetism

已經將近幾個月冇動過這方面的腦筋了。感覺很好。Direct exchange, superexchange, tight-binding.. 希望以後至少大概記得係乜黎。

"The exchange interaction is normally very short-ranged so that the longer-ranged interaction that is operating in this case must be in some sense 'super'." 哩句好正。

看來一大清早看看好看的小說真的會促進一整天的腦部活動。我真係有 d 睇哂意大利佬 Italo Calvino 所有作品的衝動。