# Tag Info

## New answers tagged topological-order

1

IQHE is a topological phase transition, but it’s non-interacting. FQHE is also a topological phase transition, and it involves interactions. IQHE is therefore a special (“boring”) case of FQHE. The Ginzburg-Landau theory of phase transitions relies on interactions. The potential energy usually looks like: $$V \propto a\phi^2 + b\phi^4,$$ where $a$ gives ...

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