Fluctuations of a holographic quantum Hall fluid

Understand

We analyze the neutral spectrum of the holographic quantum Hall fluid described by the D2-D8' model.

• As expected for a quantum Hall state, we find the system to be stable and gapped and that, at least over much of the parameter space, the lowest excitation mode is a magneto-roton.
• In addition, we find magneto-rotons in higher modes as well.
• We show that these magneto-rotons are direct consequences of level crossings between vector and scalar modes.