"Ojanen, Teemu" - Selaus tekijän mukaan TUNICRIS-julkaisut
Viitteet 1-20 / 24
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Boiling Quantum Vacuum: Thermal Subsystems from Ground-State Entanglement
(08.09.2022)
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Complexity of fermionic states
(04 / 2024)
articleHow much information does a fermionic state contain To address this fundamental question, we define the complexity of a particle-conserving many-fermion state as the entropy of its Fock space probability distribution, ... -
Criticality in amorphous topological matter : Beyond the universal scaling paradigm
(01.12.2020)
articleWe establish the theory of critical transport in amorphous Chern insulators and show that it lies beyond the current paradigm of topological criticality epitomized by the quantum Hall transitions. We consider models of ... -
Curved spacetime theory of inhomogeneous Weyl materials
(16.10.2019)
articleWe show how the universal low-energy properties of Weyl semimetals with spatially varying time-reversal (TR) or inversion (I) symmetry breaking are described in terms of chiral fermions experiencing curved-spacetime geometry ... -
Determination of Dynamical Quantum Phase Transitions in Strongly Correlated Many-Body Systems Using Loschmidt Cumulants
(10 / 2021)
articleDynamical phase transitions extend the notion of criticality to nonstationary settings and are characterized by sudden changes in the macroscopic properties of time-evolving quantum systems. Investigations of dynamical ... -
Dynamical quantum phase transitions in strongly correlated two-dimensional spin lattices following a quench
(07 / 2022)
articleDynamical quantum phase transitions are at the forefront of current efforts to understand quantum matter out of equilibrium. Except for a few exactly solvable models, predictions of these critical phenomena typically rely ... -
Effects of electron-electron interactions in the Yu-Shiba-Rusinov lattice model
(05 / 2023)
articleIn two-dimensional superconductors, Yu-Shiba-Rusinov bound states, induced by the magnetic impurities, extend over long distances giving rise to a long-range hopping model supporting a large number of topological phases ... -
Engineering nodal topological phases in Ising superconductors by magnetic superstructures
(2020)
reviewRecently it was discovered that superconductivity in transition metal dichalcogenides (TMDs) is strongly affected by an out-of-plane spin-orbit coupling. In addition, new techniques of fabricating 2d ferromagnets on van ... -
Engineering of Chern insulators and circuits of topological edge states
(10.04.2019)
articleImpurities embedded in electronic systems induce bound states which under certain circumstances can hybridize and lead to impurity bands. Doping of insulators with impurities has been identified as a promising route toward ... -
Entanglement echo and dynamical entanglement transitions
(11 / 2021)
articleWe formulate dynamical phase transitions in subsystems embedded in larger quantum systems. Introducing the entanglement echo as an overlap of the initial and instantaneous entanglement ground states, we show its analytic ... -
Exponential Shortcut to Measurement-Induced Entanglement Phase Transitions
(11.07.2023)
articleRecently discovered measurement-induced entanglement phase transitions in monitored quantum circuits provide a novel example of far-from-equilibrium quantum criticality. Here, we propose a highly efficient strategy for ... -
Extracting electronic many-body correlations from local measurements with artificial neural networks
(04 / 2023)
articleThe characterization of many-body correlations provides a powerful tool for analyzing correlated quantum materials. However, experimental extraction of quantum entanglement in correlated electronic systems remains an open ... -
Identifying Chern numbers of superconductors from local measurements
(2023)
articleFascination in topological materials originates from their remarkable response properties and exotic quasiparticles which can be utilized in quantum technologies. In particular, large-scale efforts are currently focused ... -
Machine learning the Kondo entanglement cloud from local measurements
(15.05.2024)
articleA quantum coherent screening cloud around a magnetic impurity in metallic systems is the hallmark of the antiferromagnetic Kondo effect. Despite the central role of the Kondo effect in quantum materials, the structure of ... -
Many-body entanglement and topology from uncertainties and measurement-induced modes
(06 / 2022)
articleWe present universal characteristics of quantum entanglement and topology through virtual entanglement modes that fluctuate into existence in subsystem measurements. For generic interacting systems and extensive conserved ... -
Observation of Coexistence of Yu-Shiba-Rusinov States and Spin-Flip Excitations
(10.07.2019)
articleWe investigate the spectral evolution in different metal phthalocyanine molecules on NbSe2 surface using scanning tunnelling microscopy (STM) as a function of the coupling with the substrate. For manganese phthalocyanine ... -
Quantum Hall effect and Landau levels without spatial long-range correlations
(27.09.2023)
articleThe spectrum of charged particles in translation-invariant systems in a magnetic field is characterized by the Landau levels, which play a fundamental role in the thermodynamic and transport properties of solids. The ... -
Quantum walks on random lattices : Diffusion, localization, and the absence of parametric quantum speedup
(04 / 2023)
articleDiscrete-time quantum walks, quantum generalizations of classical random walks, provide a framework for quantum information processing, quantum algorithms, and quantum simulation of condensed-matter systems. The key property ... -
Reply to : “Topological and trivial domain wall states in engineered atomic chains”
(12 / 2022)
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Theory of the Loschmidt echo and dynamical quantum phase transitions in disordered Fermi systems
(07 / 2023)
articleIn this work we develop the theory of the Loschmidt echo and dynamical phase transitions in noninteracting strongly disordered Fermi systems after a quench. In finite systems the Loschmidt echo displays zeros in the complex ...
