Publications (2022)
Shining light into the Higgs portal with gamma gamma colliders
Authors: Garcia-Abenza, A.; No, J. M.
Journal: EUROPEAN PHYSICAL JOURNAL C
Publication date: 2022/02/01
DOI: 10.1140/epjc/s10052-022-10089-3
Abstract: High-energy ( )gamma gamma colliders constitute a potential running mode of future lepton colliders such as the ILC and CLIC. We study the sensitivity of a high-energy gamma gamma collider to the Higgs portal scenario to a hidden sector above the invisible Higgs decay threshold. We show that such gamma gamma collisions could allow to probe the existence of dark sectors through the Higgs portal with precision competitive with other planned collider facilities, profiting […]
Devil’s staircase of topological Peierls insulators and Peierls supersolids
Authors: Chanda, Titas; Gonzalez-Cuadra, Daniel; Lewenstein, Maciej; Tagliacozzo, Luca; Zakrzewski, Jakub
Journal: SCIPOST PHYSICS
Publication date: 2022/02/01
DOI: 10.21468/SciPostPhys.12.2.076
Abstract: We consider a mixture of ultracold bosonic atoms on a one-dimensional lattice described by the XXZ-Bose-Hubbard model, where the tunneling of one species depends on the spin state of a second deeply trapped species. We show how the inclusion of antiferro-magnetic interactions among the spin degrees of freedom generates a Devil’s staircase of symmetry-protected topological phases for a wide parameter regime via a bosonic analog of the Peierls mechanism in electron-phonon […]
Ionized Carbon around IRC+10216
Authors: Reach, William T.; Ruaud, Maxime; Wiesemeyer, Helmut; Riquelme, Denise; Le Ngoc Tram; Cernicharo, Jose; Smith, Nathan; Chambers, Edward T.
Journal: ASTROPHYSICAL JOURNAL
Publication date: 2022/02/01
Abstract: Asymptotic giant branch stars create a rich inventory of molecules in their envelopes as they lose mass during later stages of their evolution. These molecules cannot survive the conditions in interstellar space, where they are exposed to ultraviolet photons of the interstellar radiation field. As a result, daughter molecules are the ones injected into space, and a halo of those molecules is […]
Total Electron Detachment and Induced Cationic Fragmentation Cross Sections for Superoxide Anion (O-2(-)) Collisions with Benzene (C6H6) Molecules
Authors: Guerra, Carlos; Kumar, Sarvesh; Aguilar-Galindo, Fernando; Diaz-Tendero, Sergio; Lozano, Ana I.; Mendes, Monica; Oller, Juan C.; Limao-Vieira, Paulo; Garcia, Gustavo
Journal: INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
Publication date: 2022/02/01
DOI: 10.3390/ijms23031266
Abstract: In this study, novel experimental total electron detachment cross sections for O-2(-) collisions with benzene molecules are reported for the impact energy range (10-1000 eV), as measured with a transmission beam apparatus. By analysing the positively charged species produced during the collision events, relative total ionisation cross sections were derived in the incident energy range of 160-900 eV. […]
Quantum Fourier analysis for multivariate functions and applications to a class of Schrodinger-type partial differential equations
Authors: Garcia-Molina, Paula; Rodriguez-Mediavilla, Javier; Jose Garcia-Ripoll, Juan
Journal: PHYSICAL REVIEW A
Publication date: 2022/01/31
DOI: 10.1103/PhysRevA.105.012433
Abstract: In this work we develop a highly efficient representation of functions and differential operators based on Fourier analysis. Using this representation, we create a variational hybrid quantum algorithm to solve static, Schrodinger-type, Hamiltonian partial differential equations (PDEs), using space-efficient variational circuits, including the symmetries of the problem, and global and gradient-based optimizers. We use this algorithm to benchmark the performance of the representation techniques by means of the computation of the ground state […]
Ultra-deep 31.0-50.3 GHz spectral survey of IRC+10216
Authors: Pardo, J. R.; Cernicharo, J.; Tercero, B.; Cabezas, C.; Bermudez, C.; Agundez, M.; Gallego, J. D.; Tercero, F.; Gomez-Garrido, M.; de Vicente, P.; Lopez-Perez, J. A.
Journal: ASTRONOMY & ASTROPHYSICS
Publication date: 2022/01/28
DOI: 10.1051/0004-6361/202142263
Abstract: Context. The carbon-rich envelope of the asymptotic giant branch star CW Leo, IRC+10216, is one of the richest molecular sources in the sky. Available spectral surveys below 51 GHz are more than 25 years old, and new work is needed. Aims. Characterizing the rich molecular content of this source, specially for heavy species, requires […]
Anomalous HCN emission from warm giant molecular clouds
Authors: Goicoechea, Javier R.; Lique, Francois; Santa-Maria, Miriam G.
Journal: ASTRONOMY & ASTROPHYSICS
Publication date: 2022/01/27
DOI: 10.1051/0004-6361/202142210
Abstract: Hydrogen cyanide (HCN) is considered a good tracer of the dense molecular gas that serves as fuel for star formation. However, recent large-scale surveys of giant molecular clouds (GMCs) have detected extended HCN rotational line emission far from starforming cores. Such observations often spectroscopically resolve the HCN J = 1-0 (partially also the J = 2-1 and 3-2) hyperfine structure (HFS). A precise determination of the physical conditions of the gas requires […]
Helium structures around SF5+ and SF6+: novel intermolecular potential and mass spectrometry experiments
Authors: Zunzunegui-Bru, Eva; Gruber, Elisabeth; Bergmeister, Stefan; Meyer, Miriam; Zappa, Fabio; Bartolomei, Massimiliano; Pirani, Fernando; Villarreal, Pablo; Gonzalez-Lezana, Tomas; Scheier, Paul
Journal: PHYSICAL CHEMISTRY CHEMICAL PHYSICS
Publication date: 2022/01/26
DOI: 10.1039/d1cp04725f
Abstract: Helium clusters around the recently experimentally observed sulphur hexafluoride SF6+ and sulphur pentafluoride SF5+ ions are investigated using a combined experimental and theoretical effort. Mass spectrometry ion yields are obtained and the energetics and structure of the corresponding He-N-SF6+ and He-N-SF5+ clusters are analyzed using path integral molecular dynamics calculations as a function of N, the number of He […]
Real Space Visualization of Entangled Excitonic States in Charged Molecular Assemblies
Authors: Dolezal, Jiri; Canola, Sofia; Hapala, Prokop; Ferreira, Rodrigo Cezar de Campos; Merino, Pablo; Svec, Martin
Journal: ACS NANO
Publication date: 2022/01/25
Abstract: Entanglement of excitons holds great promise for the future of quantum computing, which would use individual molecular dyes as building blocks of their circuitry. Studying entangled excitonic eigenstates emerging in coupled molecular assemblies in the near-field with submolecular resolution has the potential to bring insight into the photophysics of these fascinating quantum phenomena. In contrast to far-field spectroscopies, near-field spectroscopic mapping permits direct identification of the […]
Ultrastrong Capacitive Coupling of Flux Qubits
Authors: Hita-Perez, Maria; Jauma, Gabriel; Pino, Manuel; Garcia-Ripoll, Juan Jose
Journal: PHYSICAL REVIEW APPLIED
Publication date: 2022/01/24
DOI: 10.1103/PhysRevApplied.17.014028
Abstract: A flux qubit can interact strongly when it is capacitively coupled to other circuit elements. This interaction can be separated into two parts, one acting on the qubit subspaces and one in which excited states mediate the interaction. The first term dominates the interaction between the flux qubit and an LC resonator, leading to ultrastrong couplings of the form sigma(y)(a + a dagger), which complement the inductive sigma(x)i(a dagger – a) […]
Discovery of C5H+ and detection of C3H+ in TMC-1 with the QUIJOTE line surveyx22c6;
Authors: Cernicharo, J.; Agundez, M.; Cabezas, C.; Fuentetaja, R.; Tercero, B.; Marcelino, N.; Endo, Y.; Pardo, J. R.; de Vicente, P.
Journal: ASTRONOMY & ASTROPHYSICS
Publication date: 2022/01/24
DOI: 10.1051/0004-6361/202142992
Abstract: We report the discovery of the C5H+ cation toward TMC-1 with the QUIJOTE line survey. Four lines from Jx2004;=7 – 6 up to J10 – 9 have been identified in perfect harmonic frequency relation that can be fit with Bx2004;=2411.94397 +/- 0.00055 MHz and Dx2004;=138 +/- 3 Hz. The standard deviation of the fit is 4.4 kHz. After discarding potential […]
Assessment of DFT approaches in noble gas clathrate-like clusters: stability and thermodynamics
Authors: Yanes-Rodriguez, Raquel; Prosmiti, Rita
Journal: PHYSICAL CHEMISTRY CHEMICAL PHYSICS
Publication date: 2022/01/19
DOI: 10.1039/d1cp04935f
Abstract: We have assessed the performance and accuracy of different wavefunction-based electronic structure methods, such as DFMP2 and domain-based local pair-natural orbital (DLPNO-CCSD(T)), as well as a variety of density functional theory (DFT) approaches on He@(H2O)(N) cage systems. We have selected representative clathrate-like structures corresponding to the building blocks present in each of the sI, sII and sH natural gas clathrate hydrates, and we have carefully studied the interaction between a He atom with each of […]
On some unexplored decoherence aspects in the Caldeira-Leggett formalism: arrival time distributions, identical particles and diffraction in time
Authors: Mousavi, S., V; Miret-Artes, S.
Journal: EUROPEAN PHYSICAL JOURNAL PLUS
Publication date: 2022/01/19
DOI: 10.1140/epjp/s13360-022-02367-6
Abstract: Some unexplored decoherence aspects within the Caldeira-Leggett master equation are analyzed and discussed. The decoherence process is controlled by the two environment parameters, the relaxation rate or friction and the temperature, leading to a gradual transition from the quantum to classical regime. Arrival time distributions, non-minimum-uncertainty-product or stretching Gaussian wave packets, identical particles and diffraction in time display interesting features during the decoherence process undergone by the time dependent interference patterns. We show that […]
Detection of the propargyl radical at lambda 3 mm
Authors: Agundez, M.; Marcelino, N.; Cabezas, C.; Fuentetaja, R.; Tercero, B.; de Vicente, P.; Cernicharo, J.
Journal: ASTRONOMY & ASTROPHYSICS
Publication date: 2022/01/17
DOI: 10.1051/0004-6361/202142678
Abstract: We report the detection of the propargyl radical (CH2CCH) in the cold dark cloud TMC-1 in the lambda 3 mm wavelength band. We recently discovered this species in space toward the same source at a wavelength of lambda 8 mm In those observations, various hyperfine components of the 2(0,2)-1(0,1) rotational transition, at 37.5 GHz, were detected using the Yebes 40 m telescope. Here, we used […]
Vibrational effects in the quantum dynamics of the H + D-2(+) charge transfer reaction
Authors: Roncero, O.; Andrianarijaona, V; Aguado, A.; Sanz-Sanz, C.
Journal: MOLECULAR PHYSICS
Publication date: 2022/01/17
DOI: 10.1080/00268976.2021.1948125
Abstract: The H + D-2(+)(v = 0,1 and 2) charge transfer reaction is studied using an accurate wave packet method, using recently proposed coupled diabatic potential energy surfaces. The state-to-state cross section is obtained for three different channels: non-reactive charge transfer, reactive charge transfer, and exchange reaction. The three processes proceed via the electronic transition from the first excited to the ground electronic state. The cross section for the three processes increases with the […]