School of Physics: Recent submissions
Now showing items 341-360 of 2200
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Multipartite entanglement in the Eigenstate Thermalisation Hypothesis
(2020)We study the quantum Fisher information (QFI) and, thus, the multipartite entanglement structure of thermal pure states in the context of the eigenstate thermalization hypothesis (ETH). In both the canonical ensemble and ... -
Logarithmic growth of local entropy and total correlations in many-body localized dynamics
(2020)The characterizing feature of a many-body localized phase is the existence of an extensive set of quasi-local conserved quantities with an exponentially localized support. This structure endows the system with the signature ... -
Analysis of the conditional mutual information in ballistic and diffusive non-equilibrium steady-states
(2020)The conditional mutual information (CMI) ℐ(A:C|B) quantifies the amount of correlations shared between A and C given B. It therefore functions as a more general quantifier of bipartite correlations in multipartite scenarios, ... -
Eigenstate Thermalisation in a Locally Perturbed Integrable System
(2020)Eigenstate thermalization is widely accepted as the mechanism behind thermalization in generic isolated quantum systems. Using the example of a single magnetic defect embedded in the integrable spin-1/2 XXZ chain, we show ... -
Low-frequency behavior of off-diagonal matrix elements in the integrable XXZ chain and in a locally perturbed quantum-chaotic XXZ chain
(2020)We study the matrix elements of local operators in the eigenstates of the integrable XXZ chain and of the quantum-chaotic model obtained by locally perturbing the XXZ chain with a magnetic impurity. We show that, at ... -
Nonreciprocal quantum transport at junctions of structured leads
(2019)We propose and analyze a mechanism for rectification of spin transport through a small junction between two spin baths or leads. For interacting baths, we show that transport is conditioned on the spacial asymmetry of the ... -
Role of coherence in the nonequilibrium thermodynamics of quantum systems
(2019)Exploiting the relative entropy of coherence, we isolate the coherent contribution in the energetics of a driven nonequilibrium quantum system. We prove that a division of the irreversible work can be made into a coherent ... -
Spin Heat Engine Coupled to a Harmonic-Oscillator Flywheel
(2019)We realize a heat engine using a single-electron spin as a working medium. The spin pertains to the valence electron of a trapped ^{40}Ca^{+} ion, and heat reservoirs are emulated by controlling the spin polarization via ... -
Quantum coherence and ergotropy
(2020)Constraints on work extraction are fundamental to our operational understanding of the thermodynamics of both classical and quantum systems. In the quantum setting, finite-time control operations typically generate coherence ... -
The Role of Quantum Work Statistics in Many-Body Physics
(2018)In this contribution, we aim to illustrate how quantum work statistics can be used as a tool in order to gain insight on the universal features of non-equilibrium many-body systems. Focusing on the two-point measurement ... -
Asymmetry in energy versus spin transport in certain interacting disordered systems
(2019)We study energy transport in disordered XXZ spin-1/2 chains driven to nonequilibrium configurations by thermal reservoirs of different temperatures at the boundaries, using large-scale matrix product simulations. In ... -
High-temperature coherent transport in the XXZ chain in the presence of an impurity
(2018)We study high-temperature spin transport through an anisotropic spin-12 Heisenberg chain in which integrability is broken by a single impurity close to the center of the chain. For a finite impurity strength, the level ... -
Daemonic ergotropy: Enhanced work extraction from quantum correlations
(2017)We investigate how the presence of quantum correlations can influence work extraction in closed quantum systems, establishing a new link between the field of quantum non-equilibrium thermodynamics and the one of quantum ... -
In Situ Thermometry of a Cold Fermi Gas via Dephasing Impurities
(2020)The precise measurement of low temperatures is a challenging, important, and fundamental task for quantum science. In particular, in situ thermometry is highly desirable for cold atomic systems due to their potential for ... -
Tunable phonon-induced steady state coherence in a double-quantum-dot charge qubit
(2020)Charge qubits can be created and manipulated in solid-state double-quantum-dot (DQD) platforms. Typically, these systems are strongly affected by quantum noise stemming from coupling to substrate phonons. This is usually ... -
Theoretical investigation of the structural, elastic, electronic, and dielectric properties of alkali-metal-based bismuth ternary chalcogenide
(2020)The past decade has witnessed the rapid introduction of organic-inorganic hybrid compounds in photovoltaic applications. Motivated by the strong demand for stable and nontoxic materials in this class, we report a theoretical ... -
Edge superconductivity in multilayer WT<inf>e2</inf>Josephson junction
(2020)WTe2, as a type-IIWeyl semimetal, has 2D Fermi arcs on the (001) surface in the bulk and 1D helical edge states in its monolayer. These features have recently attracted wide attention in condensed matter physics. However, ... -
The 2020 magnetism roadmap
(2020)Andreas Berger CICnanoGUNE BRTA Following the success and relevance of the 2014 and 2017 Magnetism Roadmap articles, this 2020 Magnetism Roadmap edition takes yet another timely look at newly relevant and highly active ... -
Unveiling phonons in a molecular qubit with four-dimensional inelastic neutron scattering and density functional theory
(2020)Phonons are the main source of relaxation in molecular nanomagnets, and different mechanisms have been proposed in order to explain the wealth of experimental findings. However, very limited experimental investigations on ... -
Neutral excitation density-functional theory: an efficient and variational first-principles method for simulating neutral excitations in molecules.
(2020)We introduce neutral excitation density-functional theory (XDFT), a computationally light, generally applicable, first-principles technique for calculating neutral electronic excitations. The concept is to generalise ...
