Matthias Krüger
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View article: Nanoscale Friction of Manganite Superlattice Films Controlled by Layer Thickness and Fluorine Content
Nanoscale Friction of Manganite Superlattice Films Controlled by Layer Thickness and Fluorine Content Open
Frictional losses play a major role in global energy consumption, making control of friction across length scales essential for improving efficiency. Since friction at the mesoscale often originates from processes at the nanoscale, underst…
View article: Below the surface: Nanoscale origins and macroscale control of sliding friction
Below the surface: Nanoscale origins and macroscale control of sliding friction Open
In this article, we examine the current understanding of how material properties influence dry sliding friction at the nanoscale in the absence of wear and discuss how these effects can be harnessed to control frictional losses. While the …
View article: Equilibrium trajectories quantify second-order violations of the fluctuation–dissipation theorem without the need for a model
Equilibrium trajectories quantify second-order violations of the fluctuation–dissipation theorem without the need for a model Open
Quantifying and characterizing fluctuations far away from equilibrium is a challenging task. We discuss and experimentally confirm a series expansion for a driven classical system, relating the different nonequilibrium cumulants of the obs…
View article: Jean–Léon Gérôme, His Badger and His Studio
Jean–Léon Gérôme, His Badger and His Studio Open
View article: Identities for nonlinear memory kernels
Identities for nonlinear memory kernels Open
Perturbing a system far away from equilibrium via a time-dependent protocol can formally be described by a nonlinear Volterra series expansion. Here we derive identities for the nonlinear memory kernels arising in such nonlinear expansion,…
View article: Evaluation of the probability current in the stochastic path integral formalism
Evaluation of the probability current in the stochastic path integral formalism Open
The probability current is a vital quantity in the Fokker-Planck description of stochastic processes. It characterizes non-equilibrium stationary states and appears in linear response calculations. We recover and review the probability cur…
View article: Elementary Steps of Energy Conversion in Strongly Correlated Systems: Beyond Single Quasiparticles and Rigid Bands
Elementary Steps of Energy Conversion in Strongly Correlated Systems: Beyond Single Quasiparticles and Rigid Bands Open
Energy conversion in materials can be considered as a sequence of elementary steps initiated by a primary excitation. While these steps are quite well understood in classical semiconductors in terms of quasiparticle (QP) excitations and in…
View article: Observation and control of nonmonotonic recoils in a viscoelastic fluid
Observation and control of nonmonotonic recoils in a viscoelastic fluid Open
We experimentally study the relaxation dynamics of a colloidal particle in a micellar viscoelastic fluid following different driving protocols. When the particle is driven at constant velocity for a finite duration, its recovery to equilib…
View article: Equilibrium trajectories quantify second order violation of fluctuation dissipation theorem without need of a model
Equilibrium trajectories quantify second order violation of fluctuation dissipation theorem without need of a model Open
Quantifying and characterizing fluctuations far away from equilibrium is a challenging task. We discuss and experimentally confirm a series expansion for a driven classical system, relating the different non-equilibrium cumulants of the ob…
View article: Identities for nonlinear memory kernels
Identities for nonlinear memory kernels Open
Perturbing a system far away from equilibrium via a time dependent protocol can formally be described by a nonlinear Volterra series expansion. Here we derive identities for the nonlinear memory kernels arising in such nonlinear expansion,…
View article: Advancing Energy Materials by In Situ Atomic Scale Methods
Advancing Energy Materials by In Situ Atomic Scale Methods Open
Despite significant advancements in materials design for renewable energy devices, the fundamental understanding of the underlying processes in many materials remains limited, particularly in complex, inhomogeneous systems and interfaces. …
View article: Propulsion force and heat transfer for nonreciprocal nanoparticles
Propulsion force and heat transfer for nonreciprocal nanoparticles Open
Deutsche Forschungsgemeinschaft http://dx.doi.org/10.13039/501100001659
View article: Magnetization fluctuations and magnetic after-effect probed via the anomalous Hall effect
Magnetization fluctuations and magnetic after-effect probed via the anomalous Hall effect Open
Taking advantage of the anomalous Hall effect, we electrically probe low-frequency magnetization fluctuations at room temperature in a thin ferromagnetic Pt/Co/AlOx layer stack with perpendicular magnetic anisotropy. We observe a strong en…
View article: Forces from coarse-graining non-equilibrium degrees of freedom: exact results
Forces from coarse-graining non-equilibrium degrees of freedom: exact results Open
We explore the relaxation dynamics of a tracer in a harmonic trap coupled to a non-equilibrium bath particle in a stationary state, finding qualitative differences from the well-known equilibrium case. This can be attributed to an addition…
View article: Propulsion force and heat transfer for nonreciprocal nanoparticles
Propulsion force and heat transfer for nonreciprocal nanoparticles Open
We analyze heat transfer and Casimir forces involving a nonreciprocal nanoparticle. By dissecting the resulting expressions into reciprocal and nonreciprocal contributions, we find that the particle's self emission contains $++$ and $--$ t…
View article: Evaluation of the probability current in the stochastic path integral formalism
Evaluation of the probability current in the stochastic path integral formalism Open
The probability current is a vital quantity in the Fokker-Planck description of stochastic processes. It characterizes non-equilibrium stationary states and appears in linear response calculations. We recover and review the probability cur…
View article: Mean back relaxation for position and densities
Mean back relaxation for position and densities Open
Correlation functions are a standard tool for analyzing statistical particle trajectories. Recently, a so-called mean back relaxation (MBR) has been introduced, which correlates positions at three time points. The deviation of its long-tim…
View article: Nonlinear Langevin functionals for a driven probe
Nonlinear Langevin functionals for a driven probe Open
When a probe particle immersed in a fluid with nonlinear interactions is subject to strong driving, the cumulants of the stochastic force acting on the probe are nonlinear functionals of the driving protocol. We present a Volterra series f…
View article: Reflectors Tune Near-Field Thermal Transport
Reflectors Tune Near-Field Thermal Transport Open
We explore near-field thermal radiation transport in nanoparticles embedded within a multilayer slab structure, focusing on dynamic modulation of heat flux via cavity interactions. Our findings reveal that by tuning the distance between re…
View article: Accessing activity and viscoelastic properties of artificial and living systems from passive measurement
Accessing activity and viscoelastic properties of artificial and living systems from passive measurement Open
Living systems are complex dynamic entities that operate far from thermodynamic equilibrium. Their active, non-equilibrium behaviour requires energy to drive cellular organization and dynamics. Unfortunately, most statistical mechanics app…
View article: Forces from coarse-graining nonequilibrium degrees of freedom: exact results
Forces from coarse-graining nonequilibrium degrees of freedom: exact results Open
We explore the relaxation dynamics of a tracer in a harmonic trap coupled to a non-equilibrium bath particle in stationary state, finding qualitative differences compared to the well known equilibrium case. These can be attributed to an ad…
View article: Nonlinear Langevin functionals for a driven probe
Nonlinear Langevin functionals for a driven probe Open
When a probe particle immersed in a fluid with nonlinear interactions is subject to strong driving, the cumulants of the stochastic force acting on the probe are nonlinear functionals of the driving protocol. We present a Volterra series f…
View article: Mobility-induced kinetic effects in multicomponent mixtures
Mobility-induced kinetic effects in multicomponent mixtures Open
We give an overview exploring the role of kinetics in multicomponent mixtures. Compared to the most commonly studied binary (single species plus solvent) case, multicomponent fluids show a rich interplay between kinetics and thermodynamics…
View article: Mobility-induced kinetic effects in multicomponent mixtures
Mobility-induced kinetic effects in multicomponent mixtures Open
We give an overview exploring the role of kinetics in multicomponent mixtures. Compared to the most commonly studied binary (single species plus solvent) case, multicomponent fluids show a rich interplay between kinetics and thermodynamics…
View article: Heat radiation and transfer for nanoparticles in the presence of a cylinder
Heat radiation and transfer for nanoparticles in the presence of a cylinder Open
We study heat radiation and radiative heat transfer for nanoparticles in the presence of an infinitely long cylinder in different geometrical configurations, based on its electromagnetic Green's tensor. The heat radiation of a single parti…
View article: Scale-Dependent Heat Transport in Dissipative Media via Electromagnetic Fluctuations
Scale-Dependent Heat Transport in Dissipative Media via Electromagnetic Fluctuations Open
We develop a theory for heat transport via electromagnetic waves inside media, and use it to derive a spatially nonlocal thermal conductivity tensor, in terms of the electromagnetic Green's function and potential, for any given system. Whi…
View article: Magnetization fluctuations and magnetic aftereffect probed via the anomalous Hall effect
Magnetization fluctuations and magnetic aftereffect probed via the anomalous Hall effect Open
Taking advantage of the anomalous Hall effect, we electrically probe low-frequency magnetization fluctuations at room temperature in a thin ferromagnetic Pt/Co/AlO$_x$ layer stack with perpendicular magnetic anisotropy. We observe a strong…
View article: Latest results from the RD42 collaboration on the radiation tolerance of polycrystalline diamond detectors
Latest results from the RD42 collaboration on the radiation tolerance of polycrystalline diamond detectors Open
As nuclear and particle physics facilities move to higher intensities, the detectors used there must be more radiation tolerant. Diamond is in use at many facilities due to its inherent radiation tolerance and ease of use. In this article …
View article: Friction of a driven chain: role of momentum conservation, Goldstone and radiation modes
Friction of a driven chain: role of momentum conservation, Goldstone and radiation modes Open
We analytically study friction and dissipation of a driven bead in a 1D harmonic chain, and analyze the role of internal damping mechanism as well as chain length. Specifically, we investigate Dissipative Particle Dynamics and Langevin Dyn…
View article: Entropy bound for time reversal markers
Entropy bound for time reversal markers Open
We derive a bound for entropy production in terms of the mean of normalizable path-antisymmetric observables. The optimal observable for this bound is shown to be the signum of entropy production, which is often easier determined or estima…