47 citations · 320 across the 37 of their papers we have counts for
38 papers
Approximating the density of states for Poisson distributed random Schroedinger operators
David Hasler, Jannis Koberstein
We consider a Schroedinger operator with random potential distributed according to a Poisson process. We show that expectations of matrix elements of the resolvent as well as the d…
Non-Fock Ground States in the Translation-Invariant Nelson Model Revisited Non-Perturbatively
David Hasler, Benjamin Hinrichs, Oliver Siebert
The Nelson model, describing a quantum mechanical particle linearly coupled to a bosonic field, exhibits the infrared problem in the sense that no ground state exists at arbitrary…
On dilation analyticity and spatial exponential decay of atomic ground states in non-relativistic qed
David Hasler, Christian Lejsek
We consider the ground state and the ground state energy of an atom with spinless electrons in the framework of non-relativistic qed. We show that the ground state energy as well a…
Symmetries in non-relativistic quantum electrodynamics
David Hasler, Markus Lange
We define symmetries in non-relativistic quantum electrodynamics, which have the physical interpretation of rotation, parity and time reversal symmetry. We collect transformation p…
Degenerate perturbation theory for models of quantum field theory with symmetries
David Hasler, Markus Lange
We consider Hamiltonians of models describing non-relativistic quantum mechanical matter coupled to a relativistic field of bosons. If the free Hamiltonian has an eigenvalue, we sh…
On asymptotic expansions of resolvents for Poisson distributed random Schrödinger operators
David Hasler, Jannis Koberstein
We study expectation values of matrix elements of the resolvent for a random Schrödinger operator with potential distributed according to a Poisson process. Asymptotic expansions f…