Publications (14)
Importance of local correlations for the order parameter of high-Tc superconductors
Matthias Balzer, Werner Hanke, Michael Potthoff
It is shown that local temporal correlations in addition to non-local spatial correlations are important to understand the size and the doping dependence of the d-wave superconduct…
Improved limit on the effective electron neutrino mass with the ECHo-1k experiment
Fabienne Adam, Felix Ahrens, Luis E. Ardila Perez +56
The effective electron neutrino mass can be determined by analyzing the endpoint region of the Ho electron capture spectrum, provided a measurement with high energy resolut…
Self-energy-functional theory for systems of interacting electrons with disorder
Michael Potthoff, Matthias Balzer
Based on a functional-integral formalism, a generalization of the self-energy-functional theory (SFT) is proposed which is applicable to systems of interacting electrons with disor…
The Remote Analog to Digital Conversion DAQ System for the TRISTAN Detector Upgrade
Andrew S. Gavin, Matthias Balzer, Suren Chilingaryan +10
The TRISTAN detector is an upgrade to the KATRIN experiment to enable a differential measurement of the tritium -decay spectrum to search for sterile neutrinos with keV masses.…
A Beam Monitor for Ion Beam Therapy based on HV-CMOS Pixel Detectors
Matthias Balzer, Alexander Dierlamm, Felix Ehrler +13
Particle therapy is a well established clinical treatment of tumors. More than one hundred particle therapy centers are in operation world wide. The advantage of using hadrons like…
Design of a mobile neutron spectrometer for the Laboratori Nazionali del Gran Sasso (LNGS)
Melih Solmaz, Klaus Eitel, Kathrin Valerius +7
Environmental neutrons are a source of background for rare event searches (e.g., dark matter direct detection and neutrinoless double beta decay experiments) taking place in deep u…
Non-equilibrium cluster-perturbation theory
Matthias Balzer, Michael Potthoff
The cluster perturbation theory (CPT) is one of the simplest but systematic quantum cluster approaches to lattice models of strongly correlated electrons with local interactions. B…
Disorder- and correlation-driven metal-insulator transitions
Matthias Balzer, Michael Potthoff
Metal-insulator transitions driven by disorder (Delta) and/or by electron correlations (U) are investigated within the Anderson-Hubbard model with local binary-alloy disorder using…
Variational cluster approach to ferromagnetism in infinite dimensions and in one-dimensional chains
Matthias Balzer, Michael Potthoff
The variational cluster approach (VCA) is applied to study spontaneous ferromagnetism in the Hubbard model at zero temperature. We discuss several technical improvements of the num…
DTS-100G -- A versatile heterogeneous MPSoC board for cryogenic sensor readout
Timo Muscheid, Artur Boebel, Nick Karcher +7
Heterogeneous devices such as the Multi-Processor System-on-Chip (MPSoC) from Xilinx are extremely valuable in custom instrumentation systems. This contribution presents the joint…
Non-perturbative conserving approximations and Luttinger's sum rule
Jutta Ortloff, Matthias Balzer, Michael Potthoff
Weak-coupling conserving approximations can be constructed by truncations of the Luttinger-Ward functional and are well known as thermodynamically consistent approaches which respe…
Mott transition in one dimension: Benchmarking dynamical cluster approaches
Matthias Balzer, Werner Hanke, Michael Potthoff
The variational cluster approach (VCA) is applied to the one-dimensional Hubbard model at zero temperature using clusters (chains) of up to ten sites with full diagonalization and…
Krylov-space approach to the equilibrium and the nonequilibrium single-particle Green's function
Matthias Balzer, Nadine Gdaniec, Michael Potthoff
The zero-temperature single-particle Green's function of correlated fermion models with moderately large Hilbert-space dimensions can be calculated by means of Krylov-space techniq…
First order Mott transition at zero temperature in two dimensions: Variational plaquette study
Matthias Balzer, Bumsoo Kyung, David Sénéchal +2
The nature of the metal-insulator Mott transition at zero temperature has been discussed for a number of years. Whether it occurs through a quantum critical point or through a firs…