Publications (2022)
First detection of AIF line emission towards M-type AGB stars
Authors: Saberi, M.; Khouri, T.; Velilla-Prieto, L.; Fonfria, J. P.; Vlemmings, W. H. T.; Wedemeyer, S.
Journal: ASTRONOMY & ASTROPHYSICS
Publication date: 2022/07/13
DOI: 10.1051/0004-6361/202141704
Abstract: The nucleosynthesis production of fluorine (F) is still a matter of debate. Asymptotic giant branch (AGB) stars are one of the main candidates for F production. However, their contribution to the total F budget is not fully known due to the lack of observations. In this paper, we report the detection of aluminium monofluoride (AlF) line emission, one of the two main carriers of F […]
Discovery of CH2CCHC4H and a rigorous detection of CH2CCHC3N in TMC-1 with the QUIJOTE line survey
Authors: Fuentetaja, R.; Cabezas, C.; Agundez, M.; Tercero, B.; Marcelino, N.; Pardo, J. R.; de Vicente, P.; Cernicharo, J.
Journal: ASTRONOMY & ASTROPHYSICS
Publication date: 2022/07/08
DOI: 10.1051/0004-6361/202243857
Abstract: Using the QUIJOTE line survey in the 32.0-50.4 GHz range, we report the discovery of the molecule CH2CCHC4H towards the prestellar cold core TMC-1 in the Taurus region. We also present a rigorous detection of CH2CCHC3N, along with its detailed analysis. We identified a total of twenty rotational transitions for each one of these molecules. The rotational quantum numbers range from J(u) […]
Exceptional spectral phase in a dissipative collective spin model
Authors: Rubio-Garcia, Alvaro; Corps, Angel L.; Relano, Armando; Molina, Rafael A.; Perez-Bernal, Francisco; Enrique Garcia-Ramos, Jose; Dukelsky, Jorge
Journal: PHYSICAL REVIEW A
Publication date: 2022/07/07
DOI: 10.1103/PhysRevA.106.L010201
Abstract: We study a model of a quantum collective spin weakly coupled to a spin-polarized Markovian environment and find that the spectrum is divided into two regions that we name normal and exceptional Liouvillian spectral phases. In the thermodynamic limit, the exceptional spectral phase displays the unique property of being made up exclusively of second-order exceptional points. As a consequence, the evolution of any […]
Surface diffusion within the Caldeira-Leggett formalism
Authors: Torres-Miyares, E. E.; Rojas-Lorenzo, G.; Rubayo-Soneira, J.; Miret-Artes, S.
Journal: PHYSICAL CHEMISTRY CHEMICAL PHYSICS
Publication date: 2022/07/06
DOI: 10.1039/d2cp01579j
Abstract: Surface diffusion is described in terms of the intermediate scattering function in the time domain and reciprocal space. Two extreme time regimes are analyzed, ballistic (very short times) and Brownian or diffusive (very long times). This open dynamics is studied from the master equation for the reduced density matrix within the Caldeira-Leggett formalism. Several characteristic magnitudes in this decoherence process such as the coherence length, ensemble width and purity of […]
Topology detection in cavity QED
Authors: Perez-Gonzalez, Beatriz; Gomez-Leon, Alvaro; Platero, Gloria
Journal: PHYSICAL CHEMISTRY CHEMICAL PHYSICS
Publication date: 2022/07/06
DOI: 10.1039/d2cp01806c
Abstract: We explore the physics of topological lattice models immersed in c-QED architectures for arbitrary coupling strength with the photon field. We propose the use of the cavity transmission as a topological marker and study its behaviour. For this, we develop an approach combining the input-output formalism with a Mean-Field plus fluctuations description of the setup. We illustrate our results with the specific case of a fermionic Su-Schrieffer-Heeger (SSH) chain coupled to a single-mode […]
Molecular hydrogen isotope separation by a graphdiyne membrane: a quantum-mechanical study
Authors: Garcia-Arroyo, Esther; Campos-Martinez, Jose; Bartolomei, Massimiliano; Pirani, Fernando; Hernandez, Marta I.
Journal: PHYSICAL CHEMISTRY CHEMICAL PHYSICS
Publication date: 2022/07/06
DOI: 10.1039/d2cp01044e
Abstract: Graphdiyne (GDY) has emerged as a very promising two-dimensional (2D) membrane for gas separation technologies. One of the most challenging goals is the separation of deuterium (D-2) and tritium (T-2) from a mixture with the most abundant hydrogen isotope, H-2, an achievement that would be of great value for a number of industrial and scientific applications. In this work we study the separation of hydrogen isotopes in their […]
Discovery of the cyclic C5H radical in TMC-1
Authors: Cabezas, C.; Agundez, M.; Fuentetaja, R.; Endo, Y.; Marcelino, N.; Tercero, B.; Pardo, J. R.; de Vicente, P.; Cernicharo, J.
Journal: ASTRONOMY & ASTROPHYSICS
Publication date: 2022/07/01
DOI: 10.1051/0004-6361/202244063
Abstract: Cyclic C5H (c-C5H), the radical formed by substituting an ethynyl group CCH for the hydrogen atom in the c-C3H radical, has been detected for the first time in the space. The c-C5H species is an isomer of the well-known linear radical l-C5H and is similar to 6 kcal mol(-1) less stable. A total of 17 rotational transitions were detected for […]
MUSSES2020J: The Earliest Discovery of a Fast Blue Ultraluminous Transient at Redshift 1.063
Authors: Jiang, Ji-an; Yasuda, Naoki; Maeda, Keiichi; Tominaga, Nozomu; Doi, Mamoru; Ivezic, Zeljko; Yoachim, Peter; Uno, Kohki; Moriya, Takashi J.; Kumar, Brajesh; Pan, Yen-Chen; Tanaka, Masayuki; Tanaka, Masaomi; Nomoto, Kenichi; Jha, Saurabh W.; Ruiz-Lapuente, Pilar; Jones, David; Shigeyama, Toshikazu; Suzuki, Nao; Kokubo, Mitsuru; Furusawa, Hisanori; Miyazaki, Satoshi; Connolly, Andrew J.; Sahu, D. K.; Anupama, G. C.
Journal: ASTROPHYSICAL JOURNAL LETTERS
Publication date: 2022/07/01
Abstract: In this Letter, we report the discovery of an ultraluminous fast-evolving transient in rest-frame UV wavelengths, MUSSES2020J, soon after its occurrence by using the Hyper […]
Bound Electron Enhanced Radiosensitisation of Nimorazole upon Charge Transfer
Authors: Kumar, Sarvesh; Ben Chouikha, Islem; Kerkeni, Boutheina; Garcia, Gustavo; Limao-Vieira, Paulo
Journal: MOLECULES
Publication date: 2022/07/01
DOI: 10.3390/molecules27134134
Abstract: This novel work reports nimorazole (NIMO) radiosensitizer reduction upon electron transfer in collisions with neutral potassium (K) atoms in the lab frame energy range of 10-400 eV. The negative ions formed in this energy range were time-of-flight mass analyzed and branching ratios were obtained. Assignment of different anions showed that more than 80% was due to the formation of the non-dissociated parent anion NIMO center dot- at 226 u and nitrogen […]
Complete Physical Characterization of Quantum Nondemolition Measurements via Tomography
Authors: Pereira, L.; Garcia-Ripoll, J. J.; Ramos, And T.
Journal: PHYSICAL REVIEW LETTERS
Publication date: 2022/06/29
DOI: 10.1103/PhysRevLett.129.010402
Abstract: We introduce a self-consistent tomography for arbitrary quantum nondemolition (QND) detectors. Based on this, we build a complete physical characterization of the detector, including the measurement processes and a quantification of the fidelity, ideality, and backaction of the measurement. This framework is a diagnostic tool for the dynamics of QND detectors, allowing us to identify errors, and to improve their calibration and design. We illustrate this on a realistic Jaynes-Cummings simulation of […]
Critical quantum metrology with fully-connected models: from Heisenberg to Kibble-Zurek scaling
Authors: Garbe, Louis; Abah, Obinna; Felicetti, Simone; Puebla, Ricardo
Journal: QUANTUM SCIENCE AND TECHNOLOGY
Publication date: 2022/06/15
Abstract: Phase transitions represent a compelling tool for classical and quantum sensing applications. It has been demonstrated that quantum sensors can in principle saturate the Heisenberg scaling, the ultimate precision bound allowed by quantum mechanics, in the limit of large probe number and long measurement time. Due to the critical slowing down, the protocol duration time is of utmost relevance in critical quantum metrology. However, how the long-time limit is reached remains […]
Dispersive Readout of Molecular Spin Qudits
Authors: Gomez-Leon, Alvaro; Luis, Fernando; Zueco, David
Journal: PHYSICAL REVIEW APPLIED
Publication date: 2022/06/14
DOI: 10.1103/PhysRevApplied.17.064030
Abstract: We study the physics of a magnetic molecule described by a ???giant??? spin with multiple (d > 2) spin states interacting with the quantized cavity field produced by a superconducting resonator. By means of the input-output formalism, we derive an expression for the output modes in the dispersive regime of operation. It includes the effect of magnetic anisotropy, which makes different spin transitions addressable. We find that the measurement of the cavity transmission allows […]
Internal rotation analysis of the microwave and millimeter wave spectra of fluoral (CF3CHO)
Authors: Bermudez, C.; Motiyenko, R. A.; Cabezas, C.; Ilyushin, V. V.; Margules, L.; Endo, Y.; Guillemin, J. C.
Journal: SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
Publication date: 2022/06/05
DOI: 10.1016/j.saa.2022.121071
Abstract: The rotational spectrum (4-40 GHz and 50-330 GHz) has been measured and analyzed for trifluoroacetaldehyde, also known as fluoral (CF3CHO), which is one of the degradation products of the fluorinated contaminants emitted into the atmosphere. The complexity of the spectroscopic analysis of this molecule arises from the strong coupling between the internal rotation motion of CF3 group and the […]
Delving into guest-free and He-filled sI and sII clathrate hydrates: a first-principles computational study
Authors: Yanes-Rodriguez, Raquel; Cabrera-Ramirez, Adriana; Prosmiti, Rita
Journal: PHYSICAL CHEMISTRY CHEMICAL PHYSICS
Publication date: 2022/06/01
DOI: 10.1039/d2cp00701k
Abstract: The dynamics of the formation of a specific clathrate hydrate as well as its thermodynamic transitions depend on the interactions between the trapped molecules and the host water lattice. The molecular-level understanding of the different underlying processes benefits not only the description of the properties of the system, but also allows the development of multiple technological applications such as gas storage, gas separation, energy transport, etc. In this work we investigate the stability […]
Decimation technique for open quantum systems: A case study with driven-dissipative bosonic chains
Authors: Gomez-Leon, Alvaro; Ramos, Tomas; Porras, Diego; Gonzalez-Tudela, Alejandro
Journal: PHYSICAL REVIEW A
Publication date: 2022/05/26
DOI: 10.1103/PhysRevA.105.052223
Abstract: The unavoidable coupling of quantum systems to external degrees of freedom leads to dissipative (nonunitary) dynamics, which can be radically different from closed-system scenarios. Such open quantum system dynamics is generally described by Lindblad master equations, whose dynamical and steady-state properties are challenging to obtain, especially in the many-particle regime. Here, we introduce a method to deal with these systems based on the calculation of a (dissipative) lattice Green???s function with a […]