Publications (2020)
Publications sorted by date descending
New molecular species at redshift z=0.89
Authors: Tercero, B.; Cernicharo, J.; Cuadrado, S.; de Vicente, P.; Guelin, M.
Contribution: Article
Journal: ASTRONOMY & ASTROPHYSICS
Publication date: 2020/04/24
DOI: 10.1051/0004-6361/202037837
Abstract: We present the first detections of CH3SH, C3H+, C3N, HCOOH, CH2CHCN, and H2CN in an extragalactic source. Namely the spiral arm of a galaxy located at z=0.89 on the line of sight to the radio-loud quasar PKS 1830-211. OCS, SO2, and NH2CN were also detected, raising the total number of molecular species identified in that early time galaxy to 54, not counting isotopologues. The detections were made […]
Combined Experimental and Theoretical Studies on Electron Transfer in Potassium Collisions with CCl4
Authors: Regeta, K.; Kumar, S.; Cunha, T.; Mendes, M.; Lozano, A., I; Pereira, P. J. S.; Garcia, G.; Moutinho, A. M. C.; Bacchus-Montabonel, M-C; Limao-Vieira, P.
Contribution: Article
Journal: JOURNAL OF PHYSICAL CHEMISTRY A
Publication date: 2020/04/23
Abstract: Negative ion formation in electron transfer experiments from fast neutral potassium (K) atom collisions with neutral tetrachloromethane (CCl4) molecules has been investigated in the laboratory frame range of 8-1000 eV. Comprehensive calculations on the electronic structure were performed for CCl4 in the presence of a potassium atom and used to help […]
Structural dynamics effects on the electronic predissociation of alkyl iodides
Authors: Murillo-Sanchez, Marta L.; Zanchet, Alexandre; Marggi Poullain, Sonia; Gonzalez-Vazquez, Jesus; Banares, Luis
Contribution: Article
Journal: SCIENTIFIC REPORTS
Publication date: 2020/04/21
DOI: 10.1038/s41598-020-62982-0
Abstract: The correlation between chemical structure and predissociation dynamics has been evaluated for a series of linear and branched alkyl iodides with increasing structural complexity by means of femtosecond time-resolved velocity map imaging experiments following excitation on the second absorption band (B-band) at around 201nm. The time-resolved images for the iodine fragment are reported and analyzed in order to extract electronic predissociation lifetimes and the temporal evolution of […]
Exploring the properties of Ag-5-TiO2 interfaces: stable surface polaron formation, UV-Vis optical response, and CO2 photoactivation
Authors: López-Caballero, Patricia; Ramallo-Lopez, Jose M.; Giovanetti, Lisandro J.; Buceta, David; Miret-Artés, Salvador; Lopez-Quintela, M. Arturo; Requejo, Felix G.; de Lara-Castells, Maria Pilar
Contribution: Article
Journal: JOURNAL OF MATERIALS CHEMISTRY A
Publication date: 2020/04/14
DOI: 10.1039/d0ta00062k
Abstract: Using a combination of first-principles modelling, X-ray absorption spectroscopy, and diffuse reflectance spectroscopy measurements, we explore the properties of Ag-5-modified TiO2 surfaces. A general electron polarization phenomenon associated with surface polarons on TiO2 has been revealed theoretically and confirmed experimentally. First, the Ag-5 cluster donates an electron to TiO2, leading to the formation of […]
Rotational spectroscopy and astronomical search for glutaronitrile
Authors: Cabezas, C.; Bermúdez, C.; Endo, Y.; Tercero, B.; Cernicharo, J.
Contribution: Article
Journal: ASTRONOMY & ASTROPHYSICS
Publication date: 2020/04/10
DOI: 10.1051/0004-6361/202037769
Abstract: Context. Nitriles constitute almost 15% of the molecules observed in the interstellar medium (ISM), surprisingly only two dinitriles have been detected in the ISM so far. The lack of astronomical detections for dinitriles may be partly explained by the absence of laboratory rotational spectroscopic data.Aims. Our goal is to investigate the rotational spectrum of glutaronitrile, N equivalent to C-CH2-CH2-CH2-C equivalent to N, in order to allow its possible […]
Quantum Simulation of Non-Perturbative Cavity QED with Trapped Ions
Authors: Jaako, Tuomas; Jose Garcia-Ripoll, Juan; Rabl, Peter
Contribution: Article
Journal: ADVANCED QUANTUM TECHNOLOGIES
Publication date: 2020/04/01
Abstract: The simulation of non-perturbative cavity-QED effects is discussed using systems of trapped ions. Specifically, the implementation of extended Dicke models with both collective dipole-field and direct dipole-dipole interactions is addressed, which represent a minimal set of models for describing light-matter interactions in the ultrastrong and deep-strong coupling regime. It is shown that this approach can be used in state-of-the-art trapped ion setups to investigate excitation spectra or the transition between sub- […]
Production and processing of graphene and related materials
Authors: Backes, Claudia; Abdelkader, Amr M.; Alonso, Concepcion; Andrieux-Ledier, Amandine; Arenal, Raul; Azpeitia, Jon; Balakrishnan, Nilanthy; Banszerus, Luca; Barjon, Julien; Bartali, Ruben; Bellani, Sebastiano; Berger, Claire; Berger, Reinhard; Ortega, M. M. Bernal; Bernard, Carlo; Beton, Peter H.; Beyer, Andre; Bianco, Alberto; Boggild, Peter; Bonaccorso, Francesco; Barin, Gabriela Borin; Botas, Cristina; Bueno, Rebeca A.; Carriazo, Daniel; Castellanos-Gomez, Andres; Christian, Meganne; Ciesielski, Artur; Ciuk, Tymoteusz; Cole, Matthew T.; Coleman, Jonathan; Coletti, Camilla; Crema, Luigi; Cun, Huanyao; Dasler, Daniela; De Fazio, Domenico; Diez, Noel; Drieschner, Simon; Duesberg, Georg S.; Fasel, Roman; Feng, Xinliang; Fina, Alberto; Forti, Stiven; Galiotis, Costas; Garberoglio, Giovanni; […]
Dissipative quantum backflow
Authors: Mousavi, S., V; Miret-Artes, S.
Contribution: Article
Journal: EUROPEAN PHYSICAL JOURNAL PLUS
Publication date: 2020/03/23
DOI: 10.1140/epjp/s13360-020-00336-5
Abstract: Dissipative backflow is studied in the context of open quantum systems. This theoretical analysis is carried out within two frameworks, the effective time-dependent Hamiltonian due to Caldirola-Kanai (CK) and the Caldeira-Leggett (CL) one where a master equation is used to describe the reduced density matrix in the presence of dissipation and temperature of the environment. Two examples are considered: the free evolution of one and two Gaussian wave packets and the time […]
Joint theoretical and experimental study on elastic electron scattering from bismuth
Authors: Predojevic, B.; Sevic, D.; Marinkovic, B. P.; McEachran, R. P.; Blanco, F.; Garcia, G.; Brunger, M. J.
Contribution: Article
Journal: PHYSICAL REVIEW A
Publication date: 2020/03/23
DOI: 10.1103/PhysRevA.101.032704
Abstract: We report on experimental elastic differential and integral cross sections for electron scattering from bismuth. The energy range of those measurements is 10-100 eV, while the scattered electron angular range in the differential cross section data is 10 degrees-150 degrees. We also supplement our experimental results with theoretical data from our optical potential approach, in this case applying two different sets […]
Distribution of Water Vapor in Molecular Clouds. II
Authors: Melnick, Gary J.; Tolls, Volker; Snell, Ronald L.; Kaufman, Michael J.; Bergin, Edwin A.; Goicoechea, Javier R.; Goldsmith, Paul F.; Gonzalez-Alfonso, Eduardo; Hollenbach, David J.; Lis, Dariusz C.; Neufeld, David A.
Contribution: Article
Journal: ASTROPHYSICAL JOURNAL
Publication date: 2020/03/20
Abstract: The depth-dependent abundance of both gas-phase and solid-state water within dense, quiescent, molecular clouds is important to both the cloud chemistry and gas cooling. Where water is in the gas phase, it is free to participate in the network of ion-neutral reactions that lead to a host of […]
Gamma-Rays from Kilonovae and the Cosmic Gamma-Ray Background
Authors: Ruiz-Lapuente, Pilar; Korobkin, Oleg
Contribution: Article
Journal: ASTROPHYSICAL JOURNAL
Publication date: 2020/03/20
Abstract: The recent detection of the gravitational-wave event GW170817, produced by the coalescence of two neutron stars, and of its optical-infrared counterpart, powered by the radioactive decay of r-process elements, has opened a new window onto gamma-ray astronomy: the direct detection of photons coming from such decays. Here, we calculate the contribution of kilonovae to the diffuse gamma-ray background in the MeV range, using recent results on the spectra of the gamma-rays emitted in individual events, […]
Mediator-assisted cooling in quantum annealing
Authors: Pino, M.; Garcia-Ripoll, Juan J.
Contribution: Article
Journal: PHYSICAL REVIEW A
Publication date: 2020/03/18
DOI: 10.1103/PhysRevA.101.032324
Abstract: We show a significant reduction of errors for an architecture of quantum annealers where bosonic modes mediate the interaction between qubits. These systems have a large redundancy in the subspace of solutions, supported by arbitrarily large bosonic occupations. We explain how this redundancy leads to a mitigation of errors when the bosonic modes operate in the ultrastrong coupling regime. Numerical simulations also predict a large increase of qubit coherence for a specific annealing […]
Origin of the Electron-Phonon Interaction of Topological Semimetal Surfaces Measured with Helium Atom Scattering
Authors: Benedek, Giorgio; Miret-Artes, Salvador; Manson, J. R.; Ruckhofer, Adrian; Ernst, Wolfgang E.; Tamtoegl, Anton
Contribution: Article
Journal: JOURNAL OF PHYSICAL CHEMISTRY LETTERS
Publication date: 2020/03/05
DOI: 10.1021/acs.jpclett.9b03829
Abstract: He atom scattering has been demonstrated to be a sensitive probe of the electron-phonon interaction parameter lambda at metal and metal-overlayer surfaces. Here it is shown that the theory linking lambda to the thermal attenuation of atom scattering spectra (the Debye-Waller factor) can be applied to topological semimetal surfaces, such as the quasi-one-dimensional charge-density-wave system Bi(114) and the layered pnictogen chalcogenides. The […]
Theoretical priors in scalar-tensor cosmologies: Thawing quintessence
Authors: Garcia-Garcia, Carlos; Bellini, Emilio; Ferreira, Pedro G.; Traykova, Dina; Zumalacarregui, Miguel
Contribution: Article
Journal: PHYSICAL REVIEW D
Publication date: 2020/03/05
DOI: 10.1103/PhysRevD.101.063508
Abstract: The late time acceleration of the Universe can be characterized in terms of an extra, time-dependent, component of the Universe-dark energy. The simplest proposal for dark energy is a scalar-tensor theory-quintessence-which consists of a scalar field, phi, whose dynamics is solely dictated by its potential, V(phi). Such a theory can be uniquely characterized by the equation of state of the scalar field energy momentum-tensor. We find the […]
Multimode Fock states with large photon number: effective descriptions and applications in quantum metrology
Authors: Perarnau-Llobet, M.; Gonzalez-Tudela, A.; Cirac, J., I
Contribution: Article
Journal: QUANTUM SCIENCE AND TECHNOLOGY
Publication date: 2020/03/01
Abstract: We develop general tools to characterise and efficiently compute relevant observables of multimode N-photon states generated in nonlinear decays in one-dimensional waveguides. We then consider optical interferometry in a Mach-Zender interferometer where a d-mode photonic state enters in each arm of the interferometer. We derive a simple expression for the quantum Fisher information in terms of the average photon number in each mode, and show that it can be saturated […]