Markus Garst
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View article: Topological Dipoles of Quantum Skyrmions
Topological Dipoles of Quantum Skyrmions Open
Magnetic skyrmions are spatially localized whirls of spin moments in two dimensions, featuring a nontrivial topological charge and a well-defined topological charge density. We demonstrate that the quantum dynamics of magnetic skyrmions is…
View article: Elastic quantum criticality in nematics and altermagnets via the elastocaloric effect
Elastic quantum criticality in nematics and altermagnets via the elastocaloric effect Open
The coupling between electronic nematic degrees of freedom and acoustic phonons is known to significantly alter the universality class of a nematic quantum critical point (QCP). While non-Fermi-liquid behavior emerges in the absence of lat…
View article: Magnetic $2π$ domain walls for tunable Majorana devices
Magnetic $2π$ domain walls for tunable Majorana devices Open
Identifying realistic platforms capable of controlled operations with Majorana bound states is a key challenge in the study of topological superconductivity. Among the most promising proposals are magnet-superconductor hybrid devices, whic…
View article: Elastic Quantum Criticality in Nematics and Altermagnets via the Elasto-Caloric Effect
Elastic Quantum Criticality in Nematics and Altermagnets via the Elasto-Caloric Effect Open
The coupling between electronic nematic degrees of freedom and acoustic phonons is known to significantly alter the universality class of a nematic quantum critical point (QCP). While non-Fermi-liquid behaviour emerges in the absence of la…
View article: Topological dipoles of quantum skyrmions
Topological dipoles of quantum skyrmions Open
Magnetic skyrmions are spatially localized whirls of spin moments in two dimension, featuring a nontrivial topological charge and a well-defined topological charge density. We demonstrate that the quantum dynamics of magnetic skyrmions is …
View article: Colloquium: Quantum Properties and Functionalities of Magnetic Skyrmions
Colloquium: Quantum Properties and Functionalities of Magnetic Skyrmions Open
Competing magnetic interactions may stabilize smooth magnetization textures that can be characterized by a topological winding number. Such textures, which are spatially localized within a two-dimensional plane, are commonly known as skyrm…
View article: Pairing at a single Van Hove point
Pairing at a single Van Hove point Open
We show that an interacting electronic system with a single ordinary or extended Van Hove point, which crosses the Fermi energy, is unstable against triplet superconductivity. The pairing mechanism is unconventional. There is no Cooper ins…
View article: Observation of the sliding phason mode of the incommensurate magnetic texture in Fe/Ir(111)
Observation of the sliding phason mode of the incommensurate magnetic texture in Fe/Ir(111) Open
The nanoscopic magnetic texture forming in a monolayer of iron on the (111) surface of iridium, Fe/Ir(111), is spatially modulated and uniaxially incommensurate with respect to the crystallographic periodicities. As a consequence, a low-en…
View article: Short-wave magnons with multipole spin precession detected in the topological bands of a skyrmion lattice
Short-wave magnons with multipole spin precession detected in the topological bands of a skyrmion lattice Open
Topological magnon bands enable uni-directional edge transport without backscattering, enhancing the robustness of magnonic circuits and providing a novel platform for exploring quantum transport phenomena. Magnetic skyrmion lattices, in p…
View article: Observation of the sliding phason mode of the incommensurate magnetic texture in Fe/Ir(111)
Observation of the sliding phason mode of the incommensurate magnetic texture in Fe/Ir(111) Open
The nanoscopic magnetic texture forming in a monolayer of iron on the (111) surface of iridium, Fe/Ir(111), is spatially modulated and uniaxially incommensurate with respect to the crystallographic periodicities. As a consequence, a low-en…
View article: Giant lattice softening at a Lifshitz transition in Sr <sub>2</sub> RuO <sub>4</sub>
Giant lattice softening at a Lifshitz transition in Sr <sub>2</sub> RuO <sub>4</sub> Open
The interplay of electronic and structural degrees of freedom in solids is a topic of intense research. More than 60 years ago, Lifshitz discussed a counterintuitive possibility: lattice softening driven by conduction electrons at topologi…
View article: Applicability and limitations of cluster perturbation theory for Hubbard models
Applicability and limitations of cluster perturbation theory for Hubbard models Open
We present important use cases and limitations when considering results obtained from cluster perturbation theory (CPT). CPT combines the solutions of small individual clusters of an infinite lattice system with the Bloch theory of convent…
View article: Quantum criticality on a compressible lattice
Quantum criticality on a compressible lattice Open
The stability of a quantum critical point in the $O(N)$ universality class with respect to an elastic coupling, that preserves $O(N)$ symmetry, is investigated for isotropic elasticity in the framework of the renormalization group (RG) clo…
View article: Giant lattice softening at a Lifshitz transition in Sr$_{2}$RuO$_{4}$
Giant lattice softening at a Lifshitz transition in Sr$_{2}$RuO$_{4}$ Open
The interplay of electronic and structural degrees of freedom in solids is a topic of intense research. Experience and intuition suggest that structural changes drive conduction electron behavior, because the large number of valence electr…
View article: Applicability and limiations of Cluster Perturbation Theory for Hubbard models
Applicability and limiations of Cluster Perturbation Theory for Hubbard models Open
These are the Cluster Greensfunctions that were used in the paper "Applicability and limiations of Cluster Perturbation Theory for Hubbard models" published as part of the special edition “S.I.: Non-Equilibrium Quantum Physics, Many Body S…
View article: Applicability and limiations of Cluster Perturbation Theory for Hubbard models
Applicability and limiations of Cluster Perturbation Theory for Hubbard models Open
These are the Cluster Greensfunctions that were used in the paper "Applicability and limiations of Cluster Perturbation Theory for Hubbard models" published as part of the special edition “S.I.: Non-Equilibrium Quantum Physics, Many Body S…
View article: Instability of magnetic skyrmion strings induced by longitudinal spin currents
Instability of magnetic skyrmion strings induced by longitudinal spin currents Open
It is well established that spin-transfer torques exerted by in-plane spin currents give rise to a motion of magnetic skyrmions resulting in a skyrmion Hall effect. In films of finite thickness or in three-dimensional bulk samples the skyr…
View article: Divergent thermal expansion and Grüneisen ratio in a quadrupolar Kondo metal
Divergent thermal expansion and Grüneisen ratio in a quadrupolar Kondo metal Open
We report on the low-temperature thermal expansion and magnetostriction of the single-impurity quadrupolar Kondo candidate Y1−xPrxIr2Zn20. In the dilute limit, we find a quadrupolar strain that possesses a singular dependence on temperatur…
View article: Topological magnon band structure of emergent Landau levels in a skyrmion lattice
Topological magnon band structure of emergent Landau levels in a skyrmion lattice Open
The motion of a spin excitation across topologically nontrivial magnetic order exhibits a deflection that is analogous to the effect of the Lorentz force on an electrically charged particle in an orbital magnetic field. We used polarized i…
View article: Screw Dislocations in Chiral Magnets
Screw Dislocations in Chiral Magnets Open
Helimagnets realize an effective lamellar ordering that supports disclination and dislocation defects. Here, we investigate the micromagnetic structure of screw dislocation lines in cubic chiral magnets using analytical and numerical metho…
View article: Detection of Topological Spin Textures via Nonlinear Magnetic Responses
Detection of Topological Spin Textures via Nonlinear Magnetic Responses Open
Topologically nontrivial spin textures, such as skyrmions and dislocations, display emergent electrodynamics and can be moved by spin currents over macroscopic distances. These unique properties and their nanoscale size make them excellent…
View article: Microwave spectroscopy of the low-temperature skyrmion state in Cu2OSeO3
Microwave spectroscopy of the low-temperature skyrmion state in Cu2OSeO3 Open
This data set is used for the figures published in Phys. Rev. Lett 126, 017202 (2021).
View article: Microwave spectroscopy of the low-temperature skyrmion state in Cu2OSeO3
Microwave spectroscopy of the low-temperature skyrmion state in Cu2OSeO3 Open
This data set is used for the figures published in Phys. Rev. Lett 126, 017202 (2021).
View article: Data supplement for "Topological magnon band structure of emergent Landau levels in a skyrmion lattice"
Data supplement for "Topological magnon band structure of emergent Landau levels in a skyrmion lattice" Open
Collection of the data sets for our paper, Topological magnon band structure of emergent Landau levels in a skyrmion lattice. (The source code supplement can be found here.) Contents Data files used for the paper's figures. Scan Figure Fil…
View article: Data supplement for "Topological magnon band structure of emergent Landau levels in a skyrmion lattice"
Data supplement for "Topological magnon band structure of emergent Landau levels in a skyrmion lattice" Open
Collection of the data sets for our paper, Topological magnon band structure of emergent Landau levels in a skyrmion lattice. (The source code supplement can be found here.) Contents Data files used for the paper's figures. Scan Figure Fil…