4 papers
Quartic multifractality and finite-size corrections at the spin quantum Hall transition
Martin Puschmann, Daniel Hernangómez-Pérez, Bruno Lang +2
The spin quantum Hall (or class C) transition represents one of the few localization-delocalization transitions for which some of the critical exponents are known exactly. Not know…
Green's functions on a renormalized lattice: An improved method for the integer quantum Hall transition
Martin Puschmann, Thomas Vojta
We introduce a performance-optimized method to simulate localization problems on bipartite tight-binding lattices. It combines an exact renormalization group step to reduce the spa…
Collective modes at a disordered quantum phase transition
Martin Puschmann, Jack Crewse, Jose A. Hoyos +1
We study the collective excitations, i.e., the Goldstone (phase) mode and the Higgs (amplitude) mode, near the superfluid--Mott glass quantum phase transition in a two-dimensional…
Integer quantum Hall transition on a tight-binding lattice
Martin Puschmann, Philipp Cain, Michael Schreiber +1
Even though the integer quantum Hall transition has been investigated for nearly four decades its critical behavior remains a puzzle. The best theoretical and experimental results…