TY  - JOUR
A1  - Ciuchi, Sergio
A1  - Di Sante, Domenico
A1  - Dobrosavljević, Vladimir
A1  - Fratini, Simone
T1  - The origin of Mooij correlations in disordered metals
JF  - npj Quantum Materials
N2  - Sufficiently disordered metals display systematic deviations from the behavior predicted by semi-classical Boltzmann transport theory. Here the scattering events from impurities or thermal excitations can no longer be considered as additive-independent processes, as asserted by Matthiessen’s rule following from this picture. In the intermediate region between the regime of good conduction and that of insulation, one typically finds a change of sign of the temperature coefficient of resistivity, even at elevated temperature spanning ambient conditions, a phenomenology that was first identified by Mooij in 1973. Traditional weak coupling approaches to identify relevant corrections to the Boltzmann picture focused on long-distance interference effects such as “weak localization”, which are especially important in low dimensions (1D and 2D) and close to the zero-temperature limit. Here we formulate a strong-coupling approach to tackle the interplay of strong disorder and lattice deformations (phonons) in bulk three-dimensional metals at high temperatures. We identify a polaronic mechanism of strong disorder renormalization, which describes how a lattice locally responds to the relevant impurity potential. This mechanism, which quantitatively captures the Mooij regime, is physically distinct and unrelated to Anderson localization, but realizes early seminal ideas of Anderson himself, concerning the interplay of disorder and lattice deformations.
KW  - electronic properties and materials
KW  - phase transitions and critical phenomena
KW  - theory and computation
Y1  - 2018
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-223148
VL  - 3
ER  - 
TY  - JOUR
A1  - Wagner, N.
A1  - Crippa, L.
A1  - Amaricci, A.
A1  - Hansmann, P.
A1  - Klett, M.
A1  - König, E. J.
A1  - Schäfer, T.
A1  - Di Sante, D.
A1  - Cano, J.
A1  - Millis, A. J.
A1  - Georges, A.
A1  - Sangiovanni, G.
T1  - Mott insulators with boundary zeros
JF  - Nature Communications
N2  - The topological classification of electronic band structures is based on symmetry properties of Bloch eigenstates of single-particle Hamiltonians. In parallel, topological field theory has opened the doors to the formulation and characterization of non-trivial phases of matter driven by strong electron-electron interaction. Even though important examples of topological Mott insulators have been constructed, the relevance of the underlying non-interacting band topology to the physics of the Mott phase has remained unexplored. Here, we show that the momentum structure of the Green’s function zeros defining the “Luttinger surface" provides a topological characterization of the Mott phase related, in the simplest description, to the one of the single-particle electronic dispersion. Considerations on the zeros lead to the prediction of new phenomena: a topological Mott insulator with an inverted gap for the bulk zeros must possess gapless zeros at the boundary, which behave as a form of “topological antimatter” annihilating conventional edge states. Placing band and Mott topological insulators in contact produces distinctive observable signatures at the interface, revealing the otherwise spectroscopically elusive Green’s function zeros.
KW  - electronic properties and materials
KW  - topological insulators
Y1  - 2023
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-358150
VL  - 14
ER  - 
TY  - JOUR
T1  - Long-term monitoring of the ANTARES optical module efficiencies using  \(^{40}\)K decays in sea water
JF  - European Physical Journal C
N2  - Cherenkov light induced by radioactive decay products is one of the major sources of background light for deep-sea neutrino telescopes such as ANTARES. These decays are at the same time a powerful calibration source. Using data collected by the ANTARES neutrino telescope from mid 2008 to 2017, the time evolution of the photon detection efficiency of optical modules is studied. A modest loss of only 20% in 9 years is observed. The relative time calibration between adjacent modules is derived as well.
KW  - Neutrino Telescope
KW  - Dark-Matter
KW  - Calibration
KW  - System
KW  - Light
Y1  - 2018
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-227815
VL  - 78
ER  - 
TY  - JOUR
A1  - Albert, A.
A1  - André, M.
A1  - Anghinolfi, M.
A1  - Anton, G.
A1  - Ardid, M.
A1  - Aubert, J.-J.
A1  - Aublin, J.
A1  - Avgitas, T.
A1  - Baret, B.
A1  - Barrios-Martít, J.
A1  - Basa, S.
A1  - Belhorma, B.
A1  - Bertin, V.
A1  - Biagi, S.
A1  - Bormuth, R.
A1  - Boumaaza, J
A1  - Bourret, S.
A1  - Bouwhuis, M. C.
A1  - Brânzas, H.
A1  - Bruijn, R.
A1  - Brunner, J.
A1  - Busto, J.
A1  - Capone, A.
A1  - Caramete, L.
A1  - Carr, J.
A1  - Celli, S.
A1  - Chabab, M.
A1  - Cherkaoui El Moursli, R.
A1  - Chiarusi, T.
A1  - Circella, M.
A1  - Coelho, J. A. B.
A1  - Coleiro, A.
A1  - Colomer, M
A1  - Coniglione, R.
A1  - Costantini, H.
A1  - Coyle, P.
A1  - Creusot, A.
A1  - Díaz, A. F.
A1  - Deschamps, A.
A1  - Distefano, C.
A1  - Di Palma, I.
A1  - Domi, A.
A1  - Donzaud, C.
A1  - Dornic, D.
A1  - Drouhin, D.
A1  - Eberl, T.
A1  - El Bojaddaini, I.
A1  - El Khayati, N.
A1  - Elsässer, D.
A1  - Enzenhöfer, A.
A1  - Ettahiri, A.
A1  - Fassi, F.
A1  - Felis, I.
A1  - Fermani, P.
A1  - Ferrara, G.
A1  - Fusco, L. A.
A1  - Gay, P.
A1  - Glotin, H.
A1  - Grégoire, T.
A1  - Gracia Ruiz, R.
A1  - Graf, K.
A1  - Hallmann, S.
A1  - van Haren, H.
A1  - Heijboer, A. J.
A1  - Hello, Y.
A1  - Hernández-Rey, J. J.
A1  - Hößl, J.
A1  - Hofestädt, J.
A1  - Illuminati, G.
A1  - de Jong, M.
A1  - Jongen, M.
A1  - Kadler, M.
A1  - Kalekin, O.
A1  - Katz, U.
A1  - Khan-Chowdhury, N. R.
A1  - Kouchner, A.
A1  - Kreter, M.
A1  - Kreykenbohm, I.
A1  - Kulikovskiy, V.
A1  - Lachaud, C.
A1  - Lahmann, R.
A1  - Lefèvre, D.
A1  - Leonora, E.
A1  - Levi, G.
A1  - Lotze, M.
A1  - Loucatos, S.
A1  - Marcelin, M.
A1  - Margiotta, A.
A1  - Marinelli, A.
A1  - Martínez-Mora, J. A.
A1  - Mele, R.
A1  - Melis, K.
A1  - Migliozzi, P.
A1  - Moussa, A.
A1  - Navas, S.
A1  - Nezri, E.
A1  - Nuñez, A.
A1  - Organokov, M.
A1  - Pavalas, G. E.
A1  - Pellegrino, C.
A1  - Piattelli, P.
A1  - Popa, V.
A1  - Pradier, T.
A1  - Quinn, L.
A1  - Racca, C.
A1  - Randazzo, N.
A1  - Riccobene, G.
A1  - Sánchez-Losa, A.
A1  - Saldaña, M.
A1  - Salvadori, I.
A1  - Samtleben, D. F. E.
A1  - Sanguineti, M.
A1  - Sapienza, P.
A1  - Schüssler, F.
A1  - Spurio, M.
A1  - Stolarczyk, Th.
A1  - Taiuti, M.
A1  - Tayalati, Y.
A1  - Trovato, A.
A1  - Vallage, B.
A1  - Van Elewyck, V.
A1  - Versari, F.
A1  - Vivolo, D.
A1  - Wilms, J.
A1  - Zaborov, D.
A1  - Zornoza, J. D.
A1  - Zúñiga, J.
T1  - The cosmic ray shadow of the Moon observed with the ANTARES neutrino telescope
JF  - European Physical Journal C
N2  - One of the main objectives of the ANTARES telescope is the search for point- like neutrino sources. Both the pointing accuracy and the angular resolution of the detector are important in this context and a reliableway to evaluate this performance is needed. In order to measure the pointing accuracy of the detector, one possibility is to study the shadow of the Moon, i. e. the deficit of the atmospheric muon flux from the direction of the Moon induced by the absorption of cosmic rays. Analysing the data taken between 2007 and 2016, theMoon shadow is observed with 3.5s statistical significance. The detector angular resolution for downwardgoing muons is 0.73. +/- 0.14.. The resulting pointing performance is consistent with the expectations. An independent check of the telescope pointing accuracy is realised with the data collected by a shower array detector onboard of a ship temporarily moving around the ANTARES location.
KW  - Atmospheric muons
Y1  - 2019
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-227802
VL  - 78
ER  - 
TY  - JOUR
T1  - Measuring the atmospheric neutrino oscillation parameters and constraining the 3+1 neutrino model with ten years of ANTARES data
JF  - Journal of High Energy Physics
N2  - The ANTARES neutrino telescope has an energy threshold of a few tens of GeV. This allows to study the phenomenon of atmospheric muon neutrino disappearance due to neutrino oscillations. In a similar way, constraints on the 3+1 neutrino model, which foresees the existence of one sterile neutrino, can be inferred. Using data collected by the ANTARES neutrino telescope from 2007 to 2016, a new measurement of m 2 and (23) has been performed which is consistent with world best-fit values and constraints on the 3+1 neutrino model have been derived.
KW  - Neutrino Detectors and Telescopes (experiments)
KW  - Oscillation
KW  - Matter
Y1  - 2019
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-227791
VL  - 113
IS  - 6
ER  - 
TY  - JOUR
A1  - Alacevich, Massimo
A1  - Carloni Calame, Carlo M.
A1  - Chiesa, Mauro
A1  - Montagna, Guido
A1  - Nicrosini, Oreste
A1  - Piccinini, Fulvio
T1  - Muon-electron scattering at NLO
JF  - Journal of High Energy Physics
N2  - We consider the process of muon-electron elastic scattering, which has been proposed as an ideal framework to measure the running of the electromagnetic coupling constant at space-like momenta and determine the leading-order hadronic contribution to the muon g-2 (MUonE experiment). We compute the next-to-leading (NLO) contributions due to QED and purely weak corrections and implement them into a fully differential Monte Carlo event generator, which is available for first experimental studies. We show representative phenomenological results of interest for the MUonE experiment and examine in detail the impact of the various sources of radiative corrections under different selection criteria, in order to study the dependence of the NLO contributions on the applied cuts. The study represents the first step towards the realisation of a high-precision Monte Carlo code necessary for data analysis.
KW  - NLO Computations
KW  - Anomalous magnetic-moment
KW  - Radiative-corrections
KW  - Reduction
KW  - G-2
Y1  - 2019
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-227777
VL  - 155
IS  - 2
ER  - 
TY  - JOUR
T1  - Sensitivity of the KM3NeT/ARCA neutrino telescope to point-like neutrino sources
JF  - Astroparticle Physics
N2  - KM3NeT will be a network of deep-sea neutrino telescopes in the Mediterranean Sea. The KM3NeT/ARCA detector, to be installed at the Capo Passero site (Italy), is optimised for the detection of high-energy neutrinos of cosmic origin. Thanks to its geographical location on the Northern hemisphere, KM3NeT/ARCA can observe upgoing neutrinos from most of the Galactic Plane, including the Galactic Centre. Given its effective area and excellent pointing resolution, KM3NeT/ARCA will measure or significantly constrain the neutrino flux from potential astrophysical neutrino sources. At the same time, it will test flux predictions based on gamma-ray measurements and the assumption that the gamma-ray flux is of hadronic origin. Assuming this scenario, discovery potentials and sensitivities for a selected list of Galactic sources and to generic point sources with an E-2 spectrum are presented. These spectra are assumed to be time independent. The results indicate that an observation with 3 sigma significance is possible in about six years of operation for the most intense sources, such as Supernovae Remnants RX J1713.7-3946 and Vela Jr. If no signal will be found during this time, the fraction of the gamma-ray flux coming from hadronic processes can be constrained to be below 50% for these two objects. (C) 2019 The Authors. Published by Elsevier B.V.
KW  - Astrophysical neutrino sources
KW  - Cherenkov underwater neutrino telescope
KW  - KM3NeT
KW  - Remnant RX J1713.7-3946
KW  - Particle-acceleration
KW  - Galactic sources
KW  - Cosmic-rays
KW  - Supernova
KW  - Radiation
KW  - Icecube
KW  - Shell
KW  - TEV
Y1  - 2019
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-227759
VL  - 111
ER  - 
TY  - JOUR
A1  - Abt, Raimond
A1  - Erdmenger, Johanna
A1  - Gerbershagen, Marius
A1  - Melby-Thompson, Charles M.
A1  - Northe, Christian
T1  - Holographic subregion complexity from kinematic space
JF  - Journal of High Energy Physics
N2  - We consider the computation of volumes contained in a spatial slice of AdS(3) in terms of observables in a dual CFT. Our main tool is kinematic space, defined either from the bulk perspective as the space of oriented bulk geodesics, or from the CFT perspective as the space of entangling intervals. We give an explicit formula for the volume of a general region in a spatial slice of AdS(3) as an integral over kinematic space. For the region lying below a geodesic, we show how to write this volume purely in terms of entangling entropies in the dual CFT. This expression is perhaps most interesting in light of the complexity = volume proposal, which posits that complexity of holographic quantum states is computed by bulk volumes. An extension of this idea proposes that the holographic subregion complexity of an interval, defined as the volume under its Ryu-Takayanagi surface, is a measure of the complexity of the corresponding reduced density matrix. If this is true, our results give an explicit relationship between entanglement and subregion complexity in CFT, at least in the vacuum. We further extend many of our results to conical defect and BTZ black hole geometries.
KW  - AdS-CFT Correspondence
KW  - Gauge-gravity correspondence
KW  - Black Holes in String Theory
KW  - Black-hole
KW  - Entanglement
Y1  - 2019
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-227711
VL  - 1
IS  - 12
ER  - 
TY  - JOUR
A1  - Abt, Raimond
A1  - Erdmenger, Johanna
T1  - Properties of modular Hamiltonians on entanglement plateaux
JF  - Journal of High Energy Physics
N2  - The modular Hamiltonian of reduced states, given essentially by the logarithm of the reduced density matrix, plays an important role within the AdS/CFT correspondence in view of its relation to quantum information. In particular, it is an essential ingredient for quantum information measures of distances between states, such as the relative entropy and the Fisher information metric. However, the modular Hamiltonian is known explicitly only for a few examples. For a family of states rho(lambda) that is parametrized by a scalar lambda, the first order contribution in (lambda) over tilde = lambda-lambda(0) of the modular Hamiltonian to the relative entropy between rho(lambda) and a reference state rho(lambda 0) is completely determined by the entanglement entropy, via the first law of entanglement. For several examples, e.g. for ball-shaped regions in the ground state of CFTs, higher order contributions are known to vanish. In these cases the modular Hamiltonian contributes to the Fisher information metric in a trivial way. We investigate under which conditions the modular Hamiltonian provides a non-trivial contribution to the Fisher information metric, i.e. when the contribution of the modular Hamiltonian to the relative entropy is of higher order in (lambda) over tilde. We consider one-parameter families of reduced states on two entangling regions that form an entanglement plateau, i.e. the entanglement entropies of the two regions saturate the Araki-Lieb inequality. We show that in general, at least one of the relative entropies of the two entangling regions is expected to involve (lambda) over tilde contributions of higher order from the modular Hamiltonian. Furthermore, we consider the implications of this observation for prominent AdS/CFT examples that form entanglement plateaux in the large N limit.
KW  - AdS-CFT Correspondence
KW  - Gauge-gravity correspondence
KW  - Conformal Field Theory
KW  - Relative Entropy
KW  - Complexity
Y1  - 2018
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-227693
VL  - 11
IS  - 2
ER  - 
TY  - JOUR
A1  - Dürrnagel, Matteo
A1  - Beyer, Jacob
A1  - Thomale, Ronny
A1  - Schwemmer, Tilman
T1  - Unconventional superconductivity from weak coupling
JF  - The European Physical Journal B
N2  - We develop a joint formalism and numerical framework for analyzing the superconducting instability of metals from a weak coupling perspective. This encompasses the Kohn–Luttinger formulation of weak coupling renormalization group for superconductivity as well as the random phase approximation imposed on the diagrammatic expansion of the two-particle Green’s function. The central quantity to resolve is the effective interaction in the Cooper channel, for which we develop an optimized numerical framework. Our code is capable of treating generic multi-orbital models in two as well as three spatial dimensions and, in particular, arbitrary avenues of spin-orbit coupling.
KW  - superconducting instability
KW  - metals
KW  - weak coupling
KW  - unconventional superconductivity
Y1  - 2022
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-325153
SN  - 1434-6028
VL  - 95
IS  - 7
ER  -