A Holographic Model of Quantum Hall Transition

Understand

We consider a phenomenological holographic model, inspired by the D3/D7 system with a 2+1 dimensional intersection, at finite chemical potential and magnetic field.

• At large 't Hooft coupling the system is unstable and needs regularization; the UV cutoff can be decoupled by considering a certain double scaling limit.
• At finite chemical potential the model exhibits a phase transition between states with filling fractions plus and minus one--half as the magnetic field is varied.
• By varying the parameters of the model, this phase transition can be made to happen at arbitrary values of the magnetic field.