132 citations · 385 across the 14 of their papers we have counts for
15 papers
Universal Properties of Near-Threshold Single-Neutron Resonances
Myungkuk Kim, Young-Ho Song, Hans-Werner Hammer +3
We establish universal width predictions for near-threshold single-neutron resonances in partial waves. Our results go beyond Wigner's well-known scaling behavior of cross…
Learning shape resonances from the stabilization method
Daniel Kromm, Hans-Werner Hammer, Artem Volosniev
Resonances in quantum mechanics are commonly introduced as quasi-bound states embedded in the continuum, a perspective that can be conceptually challenging due to the abstract natu…
Renormalizing Two-Neutron Halo Nuclei Without Neutron-Core Interaction
Daniel Kromm, Matthias Göbel, Hans-Werner Hammer
We consider the Effective Field Theory (EFT) scheme proposed by Hongo and Son (HS) to describe two-neutron halo nuclei where the neutron-core interaction is subleading. In this EFT…
Generalized Gross-Pitaevskii Equation for 2D Bosons with Attractive Interactions
Michał Suchorowski, Fabian Brauneis, Hans-Werner Hammer +2
We introduce a generalized Gross-Pitaevskii equation that provides a nonlinear framework for studying two-dimensional (2D) attractive Bose systems. Its defining feature is the loga…
Effective theory for strongly attractive one-dimensional fermions
Timothy G. Backert, Fabian Brauneis, Matija Čufar +3
We study a one-dimensional system of two-component fermions in the limit of strong attractive particle-particle interactions. First, we analyze scattering in the corresponding few-…
Two-dimensional bosonic droplets in a harmonic trap
Fabian Brauneis, Artem G. Volosniev, Hans-Werner Hammer
We investigate a system of bosons in a two-dimensional harmonic trap. In the limit of strong attractive interactions, the bosons make a droplet insensitive to external confinement.…
On the sensitivity of nuclear clocks to new physics
Andrea Caputo, Doron Gazit, Hans-Werner Hammer +4
The recent demonstration of laser excitation of the eV isomeric state of Thorium-229 is a significant step towards a nuclear clock. The low excitation energy likely res…
Analytical approach to the Bose polaron problem in one dimension
A. G. Volosniev, H. -W. Hammer
We discuss the ground state properties of a one-dimensional bosonic system doped with an impurity (the so-called Bose polaron problem). We introduce a formalism that allows us to c…
Ab initio lattice results for Fermi polarons in two dimensions
Shahin Bour, Dean Lee, H. -W. Hammer +1
We investigate the attractive Fermi polaron problem in two dimensions using non-perturbative Monte Carlo simulations. We introduce a new Monte Carlo algorithm called the impurity l…
Causality, universality, and effective field theory for van der Waals interactions
Serdar Elhatisari, Sebastian König, Dean Lee +1
We analyze low-energy scattering for arbitrary short-range interactions plus an attractive 1/r^6 tail. We derive the constraints of causality and unitarity and find that the van de…
Convergence Properties of the Effective Theory for Trapped Bosons
S. Tölle, H. -W. Hammer, B. Ch. Metsch
We investigate few-boson systems with resonant interactions in a narrow harmonic trap within an effective theory framework. The size of the model space is identified with the effec…
Universal few-body physics in a harmonic trap
S. Tölle, H. -W. Hammer, B. C. Metsch
Few-body systems with resonant short-range interactions display universal properties that do not depend on the details of their structure or their interactions at short distances.…
Effective Field Theory for Fermi Systems in a large N expansion
R. J. Furnstahl, H. -W. Hammer
A system of fermions with short-range interactions at finite density is studied using the framework of effective field theory. The effective action formalism for fermions with auxi…
Universal Equation for Efimov States
Eric Braaten, H. -W. Hammer, M. Kusunoki
Efimov states are a sequence of shallow 3-body bound states that arise when the 2-body scattering length is large. Efimov showed that the binding energies of these states can be ca…
The Dilute Bose-Einstein Condensate with Large Scattering Length
Eric Braaten, H. -W. Hammer, Thomas Mehen
We study a dilute Bose gas of atoms whose scattering length a is large compared to the range of their interaction. We calculate the energy density of the homogeneous Bose-Einstein…