29 citations · 29 across the 2 of their papers we have counts for
7 papers
Trapping, cooling, and photodissociation analysis of state-selected H ions produced by (3+1) multiphoton ionization
Julian Schmidt, Thomas Louvradoux, Johannes Heinrich +4
We report on the production of cold, state-selected H molecular ions in a linear RF trap. The ions are produced by (3+1) resonance-enhanced multi-photon ionisation (REMPI) of…
Mass-selective removal of ions from Paul traps using parametric excitation
Julian Schmidt, Daniel Hönig, Pascal Weckesser +3
We study a method for mass-selective removal of ions from a Paul trap by parametric excitation. This can be achieved by applying an oscillating electric quadrupole field at twice t…
The Massless Nelson Hamiltonian and its Domain
Julian Schmidt
In the theory of point interactions, one is given a formal expression for a quantum mechanical Hamiltonian. The interaction terms of the Hamiltonian are singular: they can not be r…
Interior-Boundary Conditions for Many-Body Dirac Operators and Codimension-1 Boundaries
Julian Schmidt, Stefan Teufel, Roderich Tumulka
We are dealing with boundary conditions for Dirac-type operators, i.e., first order differential operators with matrix-valued coefficients, including in particular physical many-bo…
On a Direct Description of Pseudorelativistic Nelson Hamiltonians
Julian Schmidt
Abstract interior-boundary conditions (IBC's) allow for the direct description of the domain and the action of Hamiltonians for a certain class of ultraviolet-divergent models in Q…
Complex Charges, Time Reversal Asymmetry, and Interior-Boundary Conditions in Quantum Field Theory
Julian Schmidt, Roderich Tumulka
While fundamental physically realistic Hamiltonians should be invariant under time reversal, time asymmetric Hamiltonians can occur as mathematical possibilities or effective Hamil…