Reinhold Egger
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View article: From Kardar-Parisi-Zhang Scaling to Soliton Proliferation in Josephson Junction Arrays
From Kardar-Parisi-Zhang Scaling to Soliton Proliferation in Josephson Junction Arrays Open
We propose Josephson junction arrays as realistic platforms for observing nonequilibrium scaling laws characterizing the Kardar-Parisi-Zhang (KPZ) universality class, and space-time soliton proliferation. Focusing on a two-chain ladder geo…
View article: Magnetic Bloch bands and Weiss oscillations in Dirac mass superlattices
Magnetic Bloch bands and Weiss oscillations in Dirac mass superlattices Open
We study two-dimensional Dirac fermions in a one-dimensional mass superlattice under a perpendicular magnetic field. Using exact solutions for isolated and finite arrays of domain walls, we demonstrate the persistence of Jackiw-Rebbi modes…
View article: Angular-momentum-selective nanofocusing with Weyl semimetals
Angular-momentum-selective nanofocusing with Weyl semimetals Open
We investigate the theory of surface plasmon polaritons on a magnetic Weyl semimetal conical tip. We show that the axion term in the effective electrodynamics modifies the surface plasmon polariton dispersion relation and allows all modes …
View article: Pontus-Mpemba Effects
Pontus-Mpemba Effects Open
Mpemba effects occur after a sudden quench of control parameters if, for “far” (or “hot”) initial states with respect to a final target state, the relaxation time toward the target state is shorter than for “close” (or “cold”) initial stat…
View article: Magnetic-field-tunable anisotropic black-body radiation and condensation of slow thermal light in dynamical axion insulators
Magnetic-field-tunable anisotropic black-body radiation and condensation of slow thermal light in dynamical axion insulators Open
Thermal radiation features of dynamical axion insulators, which are characterized by an antiferromagnetic order with simultaneously broken time-reversal and space-inversion symmetries, are investigated. Planck's radiation law is shown to e…
View article: Data underpinning "Towards scalable active steering protocols for genuinely entangled state manifolds"
Data underpinning "Towards scalable active steering protocols for genuinely entangled state manifolds" Open
We provide the raw data used to produce plots shown in our paper "Towards scalable active steering protocols for genuinely entangled state manifolds". The data is structured by the corresponding figure in the manuscript. Subfolder structur…
View article: Nonreciprocal Weyl semimetal waveguide
Nonreciprocal Weyl semimetal waveguide Open
We study a cylindrical plasmonic waveguide consisting of a magnetic Weyl semimetal embedded in a dielectric medium. We determine the dispersion relation of the surface plasmon polaritons and show how it depends on the plasma frequency, the…
View article: Nonreciprocal Weyl semimetal waveguide
Nonreciprocal Weyl semimetal waveguide Open
We study a cylindrical plasmonic waveguide consisting of a magnetic Weyl semimetal embedded in a dielectric medium. We determine the dispersion relation of the surface plasmon polaritons and show how it depends on the plasma frequency, the…
View article: Towards scalable active steering protocols for genuinely entangled state manifolds
Towards scalable active steering protocols for genuinely entangled state manifolds Open
We introduce and analyze an active steering protocol designed to target multipartite entangled states. The protocol involves multiple qubits subjected to weak Bell-pair measurements with active feedback, where the feedback operations are o…
View article: Green's function approach to Josephson dot dynamics and application to quantum Mpemba effects
Green's function approach to Josephson dot dynamics and application to quantum Mpemba effects Open
We develop a Green's function approach for the nonequilibrium dynamics of multilevel quantum dots coupled to multiple fermionic reservoirs in the presence of a bosonic environment. Our theory is simpler than the Keldysh approach and goes b…
View article: Green's Function Approach to Josephson Dot Dynamics and Application to Quantum Mpemba Effects
Green's Function Approach to Josephson Dot Dynamics and Application to Quantum Mpemba Effects Open
We develop a Green's function approach for the nonequilibrium dynamics of multi-level quantum dots coupled to multiple fermionic reservoirs in the presence of a bosonic environment. Our theory is simpler than the Keldysh approach and goes …
View article: Error threshold in active steering protocols for few-qubit systems
Error threshold in active steering protocols for few-qubit systems Open
We study active steering protocols for weakly measured qubits in the presence of error channels due to amplitude and phase noise. If the error rate is sufficiently small, the protocol approaches and stabilizes a predesignated pure target s…
View article: Quantum description of Fermi arcs in Weyl semimetals in a magnetic field
Quantum description of Fermi arcs in Weyl semimetals in a magnetic field Open
For a Weyl semimetal (WSM) in a magnetic field, a semiclassical description of the Fermi-arc surface state dynamics is usually employed for explaining various unconventional magnetotransport phenomena, e.g., Weyl orbits, the three-dimensio…
View article: Coulomb impurities in graphene driven by fast ions
Coulomb impurities in graphene driven by fast ions Open
We provide a theoretical model for electronic transitions in a two-dimensional (2D) artificial atom in a graphene monolayer. The artificial atom is due to the presence of a charged adatom (Coulomb impurity) in the layer and interacts with …
View article: Coulomb impurities in graphene driven by fast ions
Coulomb impurities in graphene driven by fast ions Open
We provide a theoretical model for electronic transitions in a two-dimensional (2D) artificial atom in a graphene monolayer. The artificial atom is due to the presence of a charged adatom (Coulomb impurity) in the layer and interacts with …
View article: Data underpinning "Error threshold in active steering protocols for few-qubit systems"
Data underpinning "Error threshold in active steering protocols for few-qubit systems" Open
We provide the raw data used to produce plots shown in our paper "Error threshold transitions in active steering protocols". Abstract We study active steering protocols for weakly measured qubits in the presence of error channels due to am…
View article: Many-body quantum dynamics of spin-orbit coupled Andreev states in a Zeeman field
Many-body quantum dynamics of spin-orbit coupled Andreev states in a Zeeman field Open
We provide a theoretical framework to describe the quantum many-body dynamics of Andreev states in Josephson junctions with spin-orbit coupling and a magnetic Zeeman field. In such cases, employing a doubled Nambu spinor description is tec…
View article: Mpemba effects in open nonequilibrium quantum systems
Mpemba effects in open nonequilibrium quantum systems Open
We generalize the classical thermal Mpemba effect (where an initially hot system relaxes faster to the final equilibrium state than a cold one) to open quantum systems coupled to several reservoirs. We show that, in general, two different …
View article: Coulomb impurities in graphene driven by ultrashort electromagnetic pulses: excitation, ionization, and pair creation
Coulomb impurities in graphene driven by ultrashort electromagnetic pulses: excitation, ionization, and pair creation Open
We provide a theory for electronic transitions induced by ultrashort electromagnetic pulses in two-dimensional artificial relativistic atoms which are created by a charged impurity in a gapped graphene monolayer. Using a non-perturbative s…
View article: Local spin-flip transitions induced by magnetic quantum impurities in two-dimensional magnets
Local spin-flip transitions induced by magnetic quantum impurities in two-dimensional magnets Open
We predict a general local spin-flip transition mechanism caused by magnetic quantum impurities in (partially) polarized phases of quantum magnets in the absence of conservation laws. This transition arises when a magnon bound state crosse…
View article: Electric polarization near vortices in the extended Kitaev model
Electric polarization near vortices in the extended Kitaev model Open
We formulate a Majorana mean-field theory for the extended J K Γ Kitaev model in a magnetic Zeeman field of arbitrary direction, and apply it for studying spatially inhomogeneous states harboring vortices. This mean-field theory is exact i…
View article: Engineering unsteerable quantum states with active feedback
Engineering unsteerable quantum states with active feedback Open
We propose active steering protocols for quantum state preparation in quantum circuits where each system qubit is connected to a single detector qubit, employing a simple coupling selected from a small set of steering operators. The decisi…
View article: Non-Abelian anyon statistics through AC conductance of a Majorana interferometer
Non-Abelian anyon statistics through AC conductance of a Majorana interferometer Open
Demonstrating the non-Abelian Ising anyon statistics of Majorana zero modes in a physical platform still represents a major open challenge in physics. We here show that the linear low-frequency charge conductance of a Majorana interferomet…
View article: Dispersive drumhead states in nodal-line semimetal junctions
Dispersive drumhead states in nodal-line semimetal junctions Open
We consider a smooth interface between a topological nodal-line semimetal and a topologically trivial insulator (e.g., the vacuum) or another semimetal with a nodal ring of different radius. Using a low-energy effective Hamiltonian includi…
View article: Electric polarization near vortices in the extended Kitaev model
Electric polarization near vortices in the extended Kitaev model Open
We formulate a Majorana mean-field theory for the extended J-K-Gamma Kitaev model in a magnetic Zeeman field of arbitrary direction, and apply it for studying spatially inhomogeneous states harboring vortices. This mean-field theory is exa…
View article: Electric polarization near vortices in the extended Kitaev model
Electric polarization near vortices in the extended Kitaev model Open
We formulate a Majorana mean-field theory for the extended $JKΓ$ Kitaev model in a magnetic Zeeman field of arbitrary direction, and apply it for studying spatially inhomogeneous states harboring vortices. This mean-field theory is exact i…
View article: Dynamics of parafermionic states in transport measurements
Dynamics of parafermionic states in transport measurements Open
Advances in hybrid fractional quantum Hall (FQH)-superconductor platforms pave the way for realisation of parafermionic modes. We analyse signatures of these non-abelian anyons in transport measurements across devices with \mathbb{Z}_6 …
View article: Coulomb impurities in graphene driven by ultrashort electromagnetic pulses: Excitation, ionization, and pair creation
Coulomb impurities in graphene driven by ultrashort electromagnetic pulses: Excitation, ionization, and pair creation Open
We provide a theory for electronic transitions induced by ultrashort electromagnetic pulses in two-dimensional artificial relativistic atoms which are created by a charged impurity in a gapped graphene monolayer. Using a non-perturbative s…
View article: Dispersive Drumhead States in Nodal-Line Semimetal Junctions
Dispersive Drumhead States in Nodal-Line Semimetal Junctions Open
We consider a smooth interface between a topological nodal-line semimetal and a topologically trivial insulator (e.g., the vacuum) or another semimetal with a nodal ring of different radius. Using a low-energy effective Hamiltonian includi…
View article: Report on scipost_202305_00033v1
Report on scipost_202305_00033v1 Open
Advances in hybrid fractional quantum Hall (FQH)-superconductor platforms pave the way for realisation of parafermionic modes.We analyse signatures of these non-abelian anyons in transport measurements across devices with 6 parafermions (P…