M. Punk

Publications46
h-index14
Citations1,014
Highly Influential Citations41
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Spectral Functions and rf Response of Ultracold Fermionic Atoms
We present a calculation of the spectral functions and the associated rf response of ultracold fermionic atoms near a Feshbach resonance. The single particle spectra are peaked at energies that can…
Polaron-to-molecule transition in a strongly imbalanced Fermi gas
A single down spin Fermion with an attractive, zero range interaction with a Fermi sea of up-spin Fermions forms a polaronic quasiparticle. The associated quasipart icle weight vanishes beyond a…
Relaxation of antiferromagnetic order in spin-1/2 chains following a quantum quench.
TLDR
This analysis indicates that the antiferromagnetic order imprinted in the initial state vanishes exponentially and the corresponding relaxation time exhibits a minimum at the critical point, in contrast to the usual notion of critical slowing down, from which a maximum is expected.
Quantum dimer model for the pseudogap metal
TLDR
This model describes an exotic metal that is similar in many respects to simple metals like silver, however, the simple metallic character coexists with “topological order” and long-range quantum entanglement previously observed only in exotic insulators or fractional quantum Hall states in very high magnetic fields.
Topological excitations and the dynamic structure factor of spin liquids on the kagome lattice
A quantum spin liquid is a spin state with no magnetic order even at the lowest temperatures. To explain neutron scattering data on a ‘kagome lattice’ antiferromagnet, visons (elementary excitations…
Quantum quenches in the anisotropic spin-\frac{1}{2} Heisenberg chain: different approaches to many-body dynamics far from equilibrium
Recent experimental achievements in controlling ultracold gases in optical lattices open a new perspective on quantum many-body physics. In these experimental setups, it is possible to study coherent…
Theory of rf-spectroscopy of strongly interacting fermions.
We show that strong pairing correlations in Fermi gases lead to the appearance of a gaplike structure in the rf spectrum, both in the balanced superfluid and in the normal phase above the…
Fermi surface reconstruction in hole-doped t-J models without long-range antiferromagnetic order.
We calculate the Fermi surface of electrons in hole-doped, extended t-J models on a square lattice in a regime where no long-range antiferromagnetic order is present, and no symmetries are broken.…
Transport near the Ising-nematic quantum critical point of metals in two dimensions
We consider two-dimensional metals near a Pomeranchuk instability which breaks ${90}^{\ensuremath{\circ}}$ lattice rotation symmetry. Such metals realize strongly coupled non-Fermi liquids with…
Collective mode damping and viscosity in a 1D unitary Fermi gas
We calculate the damping of the Bogoliubov–Anderson mode in a one-dimensional (1D) two-component attractive Fermi gas for arbitrary coupling strength within a quantum hydrodynamic approach. Using the…
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