Michael Knap
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View article: Fractionalized prethermalization in the one-dimensional Hubbard model
Fractionalized prethermalization in the one-dimensional Hubbard model Open
Prethermalization phenomena in driven systems are generally understood via a local Floquet Hamiltonian obtained from a high-frequency expansion. Remarkably, recently it has been shown that a driven Kitaev spin liquid with fractionalized ex…
View article: Simulating Topological Order on Quantum Processors
Simulating Topological Order on Quantum Processors Open
It is an ongoing quest to realize topologically ordered quantum states on different platforms including condensed matter systems, quantum simulators and digital quantum processors. Unlike conventional states characterized by their local or…
View article: Anisotropic spin ice on a breathing pyrochlore lattice
Anisotropic spin ice on a breathing pyrochlore lattice Open
Spin ice systems represent a prime example of constrained spin systems and exhibit rich low-energy physics. In this study, we explore how introducing a tunable anisotropic spin coupling to the conventional Ising spin ice Hamiltonian on the…
View article: Quantum phase transitions between symmetry-enriched fracton phases
Quantum phase transitions between symmetry-enriched fracton phases Open
Topologically ordered phases exhibit further complexity in the presence of global symmetries: Their anyonic excitations may exhibit different transformation patterns under these symmetries, leading to a classification in terms of symmetry-…
View article: Probing non-equilibrium topological order on a quantum processor
Probing non-equilibrium topological order on a quantum processor Open
Out-of-equilibrium phases in many-body systems constitute a new paradigm in quantum matter—they exhibit dynamical properties that may otherwise be forbidden by equilibrium thermodynamics. Among these non-equilibrium phases are periodically…
View article: Scattering theory of chiral edge modes in topological magnon insulators
Scattering theory of chiral edge modes in topological magnon insulators Open
Topological magnon insulators exhibit robust edge modes with chiral properties similar to quantum Hall edge states. However, due to their strong localization at the edges, interactions between these chiral edge magnons can be significant, …
View article: Transient localization from fractionalization: vanishingly small heat conductivity in gapless quantum magnets
Transient localization from fractionalization: vanishingly small heat conductivity in gapless quantum magnets Open
Several candidate materials for gapless quantum spin liquids exhibit a vanishing thermal conductivity, which is at odds with theoretical predictions. Here, we show that a suppressed response can arise due to transient localization from fra…
View article: Tensor-Network Study of the Roughening Transition in a <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mo stretchy="false">(</mml:mo><mml:mn>2</mml:mn><mml:mo>+</mml:mo><mml:mn>1</mml:mn><mml:mo stretchy="false">)</mml:mo><mml:mi mathvariant="normal">D</mml:mi></mml:mrow></mml:math> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi mathvariant="double-struck">Z</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:math> Lattice Gauge Theory with Matter
Tensor-Network Study of the Roughening Transition in a Lattice Gauge Theory with Matter Open
Within the confined phase of (2+1)D lattice gauge theories a roughening transition arises between a weakly confined regime with floppy string excitations and a strongly confined regime with stiff string excitations. In this Letter, we use …
View article: Theory of Angle Resolved Photoemission Spectroscopy of Altermagnetic Mott Insulators
Theory of Angle Resolved Photoemission Spectroscopy of Altermagnetic Mott Insulators Open
Altermagnetism has emerged as an unconventional form of collinear magnetism with spatial rotational symmetries, that give rise to strongly spin-split bands despite of an underlying fully-compensated antiferromagnetic order. Here, we develo…
View article: Anisotropic Spin Ice on a Breathing Pyrochlore Lattice
Anisotropic Spin Ice on a Breathing Pyrochlore Lattice Open
Spin ice systems represent a prime example of constrained spin systems and exhibit rich low-energy physics. In this study, we explore how introducing a tunable anisotropic spin coupling to the conventional Ising spin ice Hamiltonian on the…
View article: Emergent Fracton Hydrodynamics of Ultracold Atoms in Partially Filled Landau Levels
Emergent Fracton Hydrodynamics of Ultracold Atoms in Partially Filled Landau Levels Open
The realization of synthetic gauge fields for charge neutral ultracold atoms and the simulation of quantum Hall physics have witnessed remarkable experimental progress. Here, we establish key signatures of fractional quantum Hall systems i…
View article: The strongly driven Fermi polaron
The strongly driven Fermi polaron Open
Quasiparticles are emergent excitations of matter that underlie much of our understanding of quantum many-body systems. Therefore, the prospect of controlling their properties has both fundamental and practical implications. However, in so…
View article: Digital quantum magnetism at the frontier of classical simulations
Digital quantum magnetism at the frontier of classical simulations Open
The utility of near-term quantum computers for simulating realistic quantum systems hinges on the stability of digital quantum matter--realized when discrete quantum gates approximate continuous time evolution--and whether it can be mainta…
View article: Tuning Transport in Solid-State Bose-Fermi Mixtures by Feshbach Resonances
Tuning Transport in Solid-State Bose-Fermi Mixtures by Feshbach Resonances Open
Transition-metal-dichalcogenide heterostructures have emerged as promising platforms for realizing tunable Bose–Fermi mixtures. Their constituents are fermionic charge carriers resonantly coupled to long-lived bosonic interlayer excitons, …
View article: Tensor-Network Study of the Roughening Transition in (2 + 1)D lattice gauge theories
Tensor-Network Study of the Roughening Transition in (2 + 1)D lattice gauge theories Open
Within the confined phase of (2+1)D lattice gauge theories a roughening transition arises between a weakly confined regime with floppy string excitations and a strongly confined regime with stiff string excitations. In this work, we use an…
View article: Purely Electronic Model for Exciton-Polaron Formation in Moiré Heterostructures
Purely Electronic Model for Exciton-Polaron Formation in Moiré Heterostructures Open
Understanding interactions between excitons and correlated electronic states presents a fundamental challenge in quantum many-body physics. Here, we introduce a purely electronic model for the formation of exciton-polarons in moiré lattice…
View article: Information-theoretic principle of emergent 1-form symmetries
Information-theoretic principle of emergent 1-form symmetries Open
Higher-form symmetries act on sub-dimensional spatial manifolds of a quantum system. They can emerge as an exact symmetry at low energies even when they are explicitly broken at the microscopic level, making them difficult to characterize.…
View article: Code and Data set for "Theory of Nonlinear Spectroscopy of Quantum Magnets"
Code and Data set for "Theory of Nonlinear Spectroscopy of Quantum Magnets" Open
Update: Please refer to version2 of the code(yet to be uploaded). We have made some changes in the code generating figure S5(Symmetric and anti-symmetric channel for radiated electric field) in the Supplementary material Code and datasets …
View article: Fractionalized Prethermalization in the One-Dimensional Hubbard Model
Fractionalized Prethermalization in the One-Dimensional Hubbard Model Open
Prethermalization phenomena in driven systems are generally understood via a local Floquet Hamiltonian obtained from a high-frequency expansion. Remarkably, recently it has been shown that a driven Kitaev spin liquid with fractionalized ex…
View article: Single-particle spectral function of fractional quantum anomalous Hall states
Single-particle spectral function of fractional quantum anomalous Hall states Open
Fractional quantum Hall states are the most prominent example of states with topological order, hosting excitations with fractionalized charge. Recent experiments in twisted MoTe2 and graphene-based heterostructures provided evidence of fr…
View article: Quantum Phase Transitions between Symmetry-Enriched Fracton Phases
Quantum Phase Transitions between Symmetry-Enriched Fracton Phases Open
Topologically ordered phases exhibit further complexity in the presence of global symmetries: Their anyonic excitations may exhibit different transformation patterns under these symmetries, leading to a classification in terms of symmetry-…
View article: Probing non-equilibrium topological order on a quantum processor
Probing non-equilibrium topological order on a quantum processor Open
Out-of-equilibrium phases in many-body systems constitute a new paradigm in quantum matter - they exhibit dynamical properties that may otherwise be forbidden by equilibrium thermodynamics. Among these non-equilibrium phases are periodical…
View article: Entanglement Properties of Gauge Theories from Higher-Form Symmetries
Entanglement Properties of Gauge Theories from Higher-Form Symmetries Open
We explore the relationship between higher-form symmetries and entanglement properties in lattice gauge theories with discrete gauge groups, which can exhibit both topologically ordered phases and higher-form symmetry-protected topological…
View article: Emergent Fracton Hydrodynamics of Ultracold Atoms in Partially Filled Landau Levels
Emergent Fracton Hydrodynamics of Ultracold Atoms in Partially Filled Landau Levels Open
The realization of synthetic gauge fields for charge neutral ultracold atoms and the simulation of quantum Hall physics has witnessed remarkable experimental progress. Here, we establish key signatures of fractional quantum Hall systems in…
View article: Single-particle spectral function of fractional quantum anomalous Hall states
Single-particle spectral function of fractional quantum anomalous Hall states Open
Fractional quantum Hall states are the most prominent example of states with topological order, hosting excitations with fractionalized charge. Recent experiments in twisted $\text{MoTe}_2$ and graphene-based heterostructures provided evid…
View article: Gate-tunable Bose-Fermi mixture in a strongly correlated moiré bilayer electron system
Gate-tunable Bose-Fermi mixture in a strongly correlated moiré bilayer electron system Open
Quantum gases consisting of species with distinct quantum statistics, such as Bose-Fermi mixtures, can behave in a fundamentally different way than their unmixed constituents. This makes them an essential platform for studying emergent qua…
View article: Scattering Theory of Chiral Edge Modes in Topological Magnon Insulators
Scattering Theory of Chiral Edge Modes in Topological Magnon Insulators Open
Topological magnon insulators exhibit robust edge modes with chiral properties similar to quantum Hall edge states. However, due to their strong localization at the edges, interactions between these chiral edge magnons can be significant, …
View article: Giant enhancement of exciton diffusion near an electronic Mott insulator
Giant enhancement of exciton diffusion near an electronic Mott insulator Open
Bose-Fermi mixtures naturally appear in various physical systems. In semiconductor heterostructures, such mixtures can be realized, with bosons as excitons and fermions as dopant charges. However, the complexity of these hybrid systems cha…