36 citations · 116 across the 11 of their papers we have counts for
11 papers
Critical Behavior and Collective Modes at the Superfluid Transition in Amorphous Systems
Vishnu Pulloor Kuttanikkad, Martin Puschmann, Rajesh Narayanan +1
We investigate the critical behavior and the dynamics of the amplitude (Higgs) mode close to the superfluid-insulator quantum phase transition in an amorphous system (i.e., a syste…
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…
Inhomogeneous mean-field approach to collective excitations in disordered interacting bosons
Martin Puschmann, João C. Getelina, José A. Hoyos +1
We develop an inhomogeneous quantum mean-field approach to the behavior of collective excitations across the superfluid-Mott glass quantum phase transition in two dimensions, compl…
Edge state critical behavior of the integer quantum Hall transition
Martin Puschmann, Philipp Cain, Michael Schreiber +1
The integer quantum Hall effect features a paradigmatic quantum phase transition. Despite decades of work, experimental, numerical, and analytical studies have yet to agree on a un…
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…
Superfluid-Mott glass quantum multicritical point on a percolating lattice
Martin Puschmann, Thomas Vojta
We employ large-scale Monte Carlo simulations to study a particle-hole symmetric site-diluted quantum rotor model in two dimensions. The ground state phase diagram of this system f…
Quantum critical behavior of the superfluid-Mott glass transition
Thomas Vojta, Jack Crewse, Martin Puschmann +2
We investigate the zero-temperature superfluid to insulator transitions in a diluted two-dimensional quantum rotor model with particle-hole symmetry. We map the Hamiltonian onto a…
Multifractal analysis of electronic states on random Voronoi-Delaunay lattices
Martin Puschmann, Philipp Cain, Michael Schreiber +1
We consider the transport of non-interacting electrons on two- and three-dimensional random Voronoi-Delaunay lattices. It was recently shown that these topologically disordered lat…
Analysis of localization-delocalization transitions in corner-sharing tetrahedral lattices
Martin Puschmann, Philipp Cain, Michael Schreiber
We study the critical behavior of the Anderson localization-delocalization transition in corner-sharing tetrahedral lattices. We compare our results obtained by three different num…