Henrik Johannesson
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View article: Entanglement generation and scaling from noisy quenches across a quantum critical point
Entanglement generation and scaling from noisy quenches across a quantum critical point Open
We study the impact of noise on the dynamics of entanglement in the transverse-field Ising chain, with the field quenched linearly across one or both of the quantum critical points of the model. Taking concurrence as a measure of entanglem…
View article: Ballistic entanglement cloud after a boundary quench
Ballistic entanglement cloud after a boundary quench Open
Entanglement has been extensively used to characterize the structure of strongly correlated many-body systems. Most of these analyses focus on either spatial properties of entanglement or its temporal behavior. Negativity, as an entangleme…
View article: Entanglement generation and scaling from noisy quenches across a quantum critical point
Entanglement generation and scaling from noisy quenches across a quantum critical point Open
We study the impact of noise on the dynamics of entanglement in the transverse-field Ising chain, with the field quenched linearly across one or both of the quantum critical points of the model. Taking concurrence as a measure of entanglem…
View article: Dynamical quantum phase transitions following a noisy quench
Dynamical quantum phase transitions following a noisy quench Open
We study how time-dependent energy fluctuations impact the dynamical quantum phase transitions (DQPTs) following a noisy ramped quench of the transverse magnetic field in a quantum Ising chain. By numerically solving the stochastic Schrödi…
View article: Spectral continuum in the Rabi–Stark model [Invited]
Spectral continuum in the Rabi–Stark model [Invited] Open
The Rabi–Stark model is a nonlinear generalization of the quantum Rabi model including the dynamical Stark shift as a tunable term, which can be realized via quantum simulation on a cavity QED platform. When the Stark coupling becomes equa…
View article: Dynamical quantum phase transitions following a noisy quench
Dynamical quantum phase transitions following a noisy quench Open
We study how time-dependent energy fluctuations impact the dynamical quantum phase transitions (DQPTs) following a noisy ramped quench of the transverse magnetic field in a quantum Ising chain. By numerically solving the stochastic Schrödi…
View article: Corrigendum: A generalization of the quantum Rabi model: exact solution and spectral structure (2017 <i>J. Phys. A: Math. Theor.</i> 50 294004)
Corrigendum: A generalization of the quantum Rabi model: exact solution and spectral structure (2017 <i>J. Phys. A: Math. Theor.</i> 50 294004) Open
View article: Floquet dynamical quantum phase transitions under synchronized periodic driving
Floquet dynamical quantum phase transitions under synchronized periodic driving Open
We study a generic class of fermionic two-band models under synchronized\nperiodic driving, i.e., with the different terms in a Hamiltonian subject to\nperiodic drives with the same frequency and phase. With all modes initially in\na maxim…
View article: Achieving spin-squeezed states by quench dynamics in a quantum chain
Achieving spin-squeezed states by quench dynamics in a quantum chain Open
We study the time evolution of spin squeezing in the one-dimensional spin-1/2 XY model subject to a sudden quantum quench of a transverse magnetic field. The initial state is selected from the ground state phase diagram of the model, consi…
View article: Entanglement in Spin Chains
Entanglement in Spin Chains Open
View article: Achieving spin-squeezed states by quench dynamics in a quantum chain
Achieving spin-squeezed states by quench dynamics in a quantum chain Open
We study the time evolution of spin squeezing in the one-dimensional spin-1/2 XY model subject to a sudden quantum quench of a transverse magnetic field. The initial state is selected from the ground state phase diagram of the model, consi…
View article: Scaling behavior in a multicritical one-dimensional topological insulator
Scaling behavior in a multicritical one-dimensional topological insulator Open
A class of Aubry-Andr\\'e-Harper models of spin-orbit coupled electrons\nexhibits a topological phase diagram where two regions belonging to the same\nphase are split up by a multicritical point. The critical lines which meet at\nthis poin…
View article: Multicriticality in a one-dimensional topological band insulator
Multicriticality in a one-dimensional topological band insulator Open
A central tenet in the theory of quantum phase transitions (QPTs) is that a nonanalyticity in a ground-state energy implies a QPT. Here we report on a finding that challenges this assertion. As a case study we take a phase diagram of a one…
View article: Transport signatures of symmetry protection in one-dimensional topological insulators
Transport signatures of symmetry protection in one-dimensional topological insulators Open
Topological insulators are identified as systems where a gapped bulk supports in-gap edge states, protected against symmetry-preserving local perturbations. In one dimension the robustness of the edge states shows up as a pinning of their …
View article: Quench dynamics and zero-energy modes: The case of the Creutz model
Quench dynamics and zero-energy modes: The case of the Creutz model Open
In most lattice models, the closing of a band gap typically occurs at high-symmetry points in the Brillouin zone. Differently, in the Creutz model $-$ describing a system of spinless fermions hopping on a two-leg ladder pierced by a magnet…
View article: Movable but not removable band degeneracies in a symmorphic crystal
Movable but not removable band degeneracies in a symmorphic crystal Open
Crossings of energy bands in solids that are not pinned at symmetry points in\nthe Brillouin zone and yet cannot be removed by perturbations are thought to be\nconditioned on the presence of a nonsymmorphic symmetry. In this Letter we show…
View article: Measurement Quench in Many-Body Systems
Measurement Quench in Many-Body Systems Open
Measurement is one of the key concepts which discriminates classical and quantum physics. Unlike classical systems, a measurement on a quantum system typically alters it drastically as a result of wave function collapse. Here we suggest th…
View article: Movable but not removable degeneracies in the band structure of a symmorphic crystal
Movable but not removable degeneracies in the band structure of a symmorphic crystal Open
Crossings of energy bands in solids that are not pinned at symmetry points in the Brillouin zone and yet cannot be removed by perturbations are thought to be conditioned on the presence of a nonsymmorphic symmetry. In this Letter we show t…
View article: Decoherence from spin environments: Loschmidt echo and quasiparticle excitations
Decoherence from spin environments: Loschmidt echo and quasiparticle excitations Open
We revisit the problem of decoherence of a qubit centrally coupled to an\ninteracting spin environment, here modeled by a quantum compass chain or an\nextended XY model in a staggered magnetic field. These two models both support\ndistinct…
View article: Half-metal phases in a quantum wire with modulated spin-orbit interaction
Half-metal phases in a quantum wire with modulated spin-orbit interaction Open
We propose a spin filter device based on the interplay of a modulated spin-orbit interaction and a uniform external magnetic field acting on a quantum wire. Half-metal phases, where electrons with only a selected spin polarization exhibit …
View article: Robustness of symmetry-protected topological states against time-periodic perturbations
Robustness of symmetry-protected topological states against time-periodic perturbations Open
The existence of gapless boundary states is a key attribute of any topological insulator. Topological band theory predicts that these states are robust against static perturbations that preserve the relevant symmetries. In this article, us…
View article: A generalization of the quantum Rabi model: exact solution and spectral structure
A generalization of the quantum Rabi model: exact solution and spectral structure Open
We consider a generalization of the quantum Rabi model where the two-level system and the single-mode cavity oscillator are coupled by an additional Stark-like term. By adapting a method recently introduced by Braak [Phys. Rev. Lett. {\bf …
View article: Loschmidt Echo Revivals: Critical and Noncritical
Loschmidt Echo Revivals: Critical and Noncritical Open
A quantum phase transition is generally thought to imprint distinctive characteristics on the nonequilibrium dynamics of a closed quantum system. Specifically, the Loschmidt echo after a sudden quench to a quantum critical point-measuring …
View article: A systematic search strategy identifies cubilin as independent prognostic marker for renal cell carcinoma
A systematic search strategy identifies cubilin as independent prognostic marker for renal cell carcinoma Open
View article: Synthesizing Majorana zero-energy modes in a periodically gated quantum wire
Synthesizing Majorana zero-energy modes in a periodically gated quantum wire Open
We explore a scheme for engineering a one-dimensional spinless p-wave\nsuperconductor hosting unpaired Majorana zero-energy modes, using an\nall-electric setup with a spin-orbit coupled quantum wire in proximity to an\ns-wave superconducto…
View article: Nonequilibrium critical scaling in quantum thermodynamics
Nonequilibrium critical scaling in quantum thermodynamics Open
The emerging field of quantum thermodynamics is contributing important results and insights into archetypal many-body problems, including quantum phase transitions. Still, the question whether out-of-equilibrium quantities, such as fluctua…
View article: Entanglement structure of the two-channel Kondo model
Entanglement structure of the two-channel Kondo model Open
Two electronic channels competing to screen a single impurity spin, as in the\ntwo-channel Kondo model, are expected to generate a ground state with\nnontrivial entanglement structure. We exploit a spin-chain representation of\nthe two-cha…
View article: Critical scaling in quantum thermodynamics
Critical scaling in quantum thermodynamics Open
The emerging field of quantum thermodynamics is contributing important results and insights into archetypal many-body problems, including quantum phase transitions. Still, the question whether out-of-equilibrium quantities, such as fluctua…
View article: Universal single-frequency oscillations in a quantum impurity system after a local quench
Universal single-frequency oscillations in a quantum impurity system after a local quench Open
Long-lived single-frequency oscillations in the local non-equilibrium\ndynamics of a quantum many-body system is an exceptional phenomenon. In fact,\ntill now, it has never been observed, nor predicted, for the physically\nrelevant case wh…
View article: Entanglement structure of the two-channel Kondo model
Entanglement structure of the two-channel Kondo model Open
Two electronic channels competing to screen a single impurity spin, as in the two-channel Kondo model, are expected to generate a ground state with nontrivial entanglement structure. We exploit a spin-chain representation of the two-channe…