Explanipedia

Exploring nonperturbative behavior of moments and cumulants in quantum theories Open

S. Schenk · 2025

The dynamics of quantum fields become nonperturbative when their interactions are probed by a large number of particles. To explore this regime, we study correlation functions that involve a large number of fields, focusing on massive scal…

Exploring Nonperturbative Behaviour of Moments and Cumulants in Quantum Theories Open

S. Schenk · 2025

The dynamics of quantum fields become nonperturbative when their interactions are probed by a large number of particles. To explore this regime we study correlation functions which involve a large number of fields, focussing on massive sca…

A coordinate-independent formalism for detecting high-frequency gravitational waves Open

Wolfram Ratzinger, S. Schenk, Pedro Schwaller · 2024

A bstract In an external electric or magnetic field, a gravitational wave (GW) may be converted into electromagnetic radiation. We present a coordinate-invariant framework to describe the GW signal in a detector that is based on this effec…

A higher-dimensional geometrical approach for the classification of 2D square-triangle-rhombus tilings Open

Marianne Impéror‐Clerc, Pavel Kalugin, S. Schenk, W. Widdra, Stefan Förster · 2024

Square-triangle-rhombus ($\mathcal{STR}$) tilings are encountered in various self-organized multi-component systems. They exhibit a rich structural diversity, encompassing both periodic tilings and long-range ordered quasicrystals, dependi…

Charting the free energy landscape of metastable topological magnetic objects Open

Juan Carlos Criado, P. D. Hatton, Álvaro Lanza, S. Schenk, Michael Spannowsky · 2024

Chiral magnets with Dzyaloshinskii-Moriya interactions feature a rich phase diagram with a variety of thermodynamical phases. These include helical and conical spin arrangements and topologically charged objects such as (anti)Skyrmions. Cr…

A Coordinate-Independent Formalism for Detecting High-Frequency Gravitational Waves Open

Wolfram Ratzinger, S. Schenk, Pedro Schwaller · 2024

In an external electric or magnetic field, a gravitational wave (GW) may be converted into electromagnetic radiation. We present a coordinate-invariant framework to describe the GW signal in a detector that is based on this effect, such as…

Primordial gravitational waves in the nano-Hertz regime and PTA data — towards solving the GW inverse problem Open

Eric Madge, Enrico Morgante, Nicklas Ramberg, Wolfram Ratzinger, S. Schenk , et al. · 2023

A bstract In recent years, several pulsar timing array collaborations have reported first hints for a stochastic gravitational wave background at nano-Hertz frequencies. Here we elaborate on the possibility that this signal comes from new …

Quantum Imprint of the Anharmonic Oscillator Open

P. Lo Chiatto, S. Schenk, G. B. Yu · 2023

We study the anharmonic double well in quantum mechanics using exact Wentzel-Kramers-Brillouin (WKB) methods in a 't Hooft-like double scaling limit where classical behavior is expected to dominate. We compute the tunneling action in this …

Primordial gravitational waves in the nano-Hertz regime and PTA data -- towards solving the GW inverse problem Open

Eric Madge, Enrico Morgante, Cristina Puchades-Ibáñez, Nicklas Ramberg, Wolfram Ratzinger , et al. · 2023

In recent years, several pulsar timing array collaborations have reported first hints for a stochastic gravitational wave background at nano-Hertz frequencies. Here we elaborate on the possibility that this signal comes from new physics th…

Toward a quantum simulation of nonlinear sigma models with a topological term Open

Jack Y. Araz, S. Schenk, Michael Spannowsky · 2023

We determine the mass gap of a two-dimensional O(3) nonlinear sigma model augmented with a topological θ-term using tensor network and digital quantum algorithms. As proof of principle, we consider the example θ=π and study its critical be…

Charting the Skyrmion Free-Energy Landscape Open

Juan Carlos Criado, P. D. Hatton, Álvaro Lanza, S. Schenk, Michael Spannowsky · 2023

Chiral magnets with Dzyaloshinskii-Moriya interactions feature a rich phase diagram with a variety of thermodynamical phases. These include helical and conical spin arrangements and topologically charged objects such as (anti)skyrmions. Cr…

2D honeycomb transformation into dodecagonal quasicrystals driven by electrostatic forces Open

S. Schenk, Oliver Krahn, Eric Cockayne, H. L. Meyerheim, M. de Boissieu , et al. · 2022

Simulating anti-skyrmions on a lattice Open

Juan Carlos Criado, S. Schenk, Michael Spannowsky, P. D. Hatton, Luke Turnbull · 2022

Towards a Quantum Simulation of Nonlinear Sigma Models with a Topological Term Open

Jack Y. Araz, S. Schenk, Michael Spannowsky · 2022

We determine the mass gap of a two-dimensional $O(3)$ nonlinear sigma model augmented with a topological $θ$-term using tensor network and digital quantum algorithms. As proof of principle, we consider the example $θ= π$ and study its crit…

2D honeycomb transformation into dodecagonal quasicrystals driven by electrostatic forces Open

S. Schenk, Oliver Krahn, Eric Cockayne, H. L. Meyerheim, Marc DeBoissieu , et al. · 2022

This repository contains the key input and output files used for the density fucntional theory calculations of the paper "Mechanism of 2D Oxide Quasicrystal formation from honeycomb structures" by Sebastian Schenk, Oliver Krahn, Eric Cocka…

2D honeycomb transformation into dodecagonal quasicrystals driven by electrostatic forces Open

S. Schenk, Oliver Krahn, Eric Cockayne, H. L. Meyerheim, Marc DeBoissieu , et al. · 2022

This repository contains the key input and output files used for the density fucntional theory calculations of the paper "Mechanism of 2D Oxide Quasicrystal formation from honeycomb structures" by Sebastian Schenk, Oliver Krahn, Eric Cocka…

2D honeycomb transformation into dodecagonal quasicrystals driven by electrostatic forces Open

S. Schenk, Oliver Krahn, Eric Cockayne, H. L. Meyerheim, Marc DeBoissieu , et al. · 2022

This repository contains the SXRD data measured for the 48-18-6 approximant in Sr-Ti-O on Pt(111). The data has been acquired at the SixS beamline of the Synchrotron SOLEIL in France on 19.09.2019. Monochromatic x-rays with photon energy o…

2D honeycomb transformation into dodecagonal quasicrystals driven by electrostatic forces Open

S. Schenk, Oliver Krahn, Eric Cockayne, H. L. Meyerheim, Marc DeBoissieu , et al. · 2022

This repository contains the SXRD data measured for the 48-18-6 approximant in Sr-Ti-O on Pt(111). The data has been acquired at the SixS beamline of the Synchrotron SOLEIL in France on 19.09.2019. Monochromatic x-rays with photon energy o…

Multiparticle amplitudes in a scalar EFT Open

Valentin V. Khoze, S. Schenk · 2022

The breakdown of resummed perturbation theory at high energies Open

S. Schenk · 2022

A bstract Calculations of high-energy processes involving the production of a large number of particles in weakly-coupled quantum field theories have previously signaled the need for novel non-perturbative behavior or even new physical phe…

Antiphase Domain Boundary Formation in 2D Ba–Ti–O on Pd(111): An Alternative to Phase Separation Open

Friederike Elisa Wührl, Oliver Krahn, S. Schenk, Stefan Förster, W. Widdra · 2021

2D oxide quasicrystals (OQCs) are unique structures arising from atoms positioned at the vertices of a dodecagonal triangle–square–rhombus tiling. The prototypical example for OQCs is derived from BaTiO 3 on Pt(111). Herein, scanning tunne…

Simulating magnetic antiskyrmions on the lattice Open

Juan Carlos Criado, P. D. Hatton, S. Schenk, Michael Spannowsky, Luke Turnbull · 2021

Magnetic skyrmions are topologically protected spin structures that naturally emerge in magnetic materials. While a vast amount of effort has gone into the study of their properties, their counterpart of opposite topological charge, the an…

Probing dark matter clumps, strings and domain walls with gravitational wave detectors Open

Joerg Jaeckel, S. Schenk, Michael Spannowsky · 2021

Challenging the stability of light millicharged dark matter Open

Joerg Jaeckel, S. Schenk · 2021

We investigate the cosmological stability of light bosonic dark matter\ncarrying a tiny electric charge. In the wave-like regime of high occupation\nnumbers, annihilation into gauge bosons can be drastically enhanced by\nparametric resonan…

Exploring instantons in nonlinear sigma models with spin-lattice systems Open

S. Schenk, Michael Spannowsky · 2021

Instanton processes are present in a variety of quantum field theories relevant to high energy as well as condensed matter physics. While they have led to important theoretical insights and physical applications, their underlying features …

Vergleich von Point-of-Care (POC) Gerinnungsmessverfahren in der Kinderkardiochirurgie Open

S. Schenk · 2020

Blutungskomplikationen gehören in der Kardiochirurgie und Kinderkardiochirurgie zu den häufigsten Komplikationen. Neben Faktoren wie Hypothermie, Kontakt des Blutes zu Fremdoberflächen und chirurgischem Trauma, gehört das gerinnungshemmend…

Probing Dark Matter Clumps, Strings and Domain Walls with Gravitational\n Wave Detectors Open

Joerg Jaeckel, S. Schenk, Michael Spannowsky · 2020

Gravitational wave astronomy has recently emerged as a new way to study our\nUniverse. In this work, we survey the potential of gravitational wave\ninterferometers to detect macroscopic astrophysical objects comprising the dark\nmatter. St…

Two‐Dimensional Wetting Layer Structures of Reduced Ternary Oxides on Ru(0001) and Pt(111) Open

Eva Maria Zollner, Fabian Schuster, K. Meinel, Philine Stötzner, S. Schenk , et al. · 2020

Long‐range ordered structures of reduced oxide films with monolayer thickness derived from and on Ru(0001) and Pt(111) are investigated by scanning tunneling microscopy (STM) and low‐energy electron diffraction (LEED). Upon ultrahigh vacuu…

Quasicrystals and their Approximants in 2D Ternary Oxides Open

Stefan Förster, S. Schenk, Eva Maria Zollner, Oliver Krahn, Cheng‐Tien Chiang , et al. · 2019

2D oxide quasicrystals (OQCs) are recently discovered aperiodic, but well‐ordered oxide interfaces. In this topical review, an introduction to these new thin‐film systems is given. The concept of quasicrystals and their approximants is exp…

Perfect Monolayers of the BaTiO<sub>3</sub>‐Derived 2D Oxide Quasicrystals Investigated by Scanning Tunneling Microscopy and Noncontact Atomic Force Microscopy Open

Eva Maria Zollner, S. Schenk, Martin Setvín, Stefan Förster · 2019

The atomic structure of the BaTiO 3 ‐derived 2D oxide quasicrystals (OQCs) is investigated using scanning tunneling microscopy (STM) and noncontact atomic force microscopy (nc‐AFM). It is demonstrated that these extraordinary films can eas…

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