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1.
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13 p, 1.2 MB |
Two-particle quantum correlations in stochastically-coupled networks
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León-Montiel, Roberto de Jesús (Universidad Nacional Autónoma de México. Instituto de Ciencias Nucleares) ;
Méndez López, Vicenç (Universitat Autònoma de Barcelona. Departament de Física) ;
Quiroz-Juárez, Mario A. (Universidad Nacional Autónoma de México. Instituto de Ciencias Nucleares) ;
Ortega, Adrian (Universidad Nacional Autónoma de México. Instituto de Ciencias Físicas) ;
Benet, Luis (Universidad Nacional Autónoma de México. Instituto de Ciencias Físicas) ;
Perez-Leija, Armando (Humboldt-Universität zu Berlin. Institut für Physik. AG Theoretische Optik Photonik (Germany)) ;
Busch, Kurt (Humboldt-Universität zu Berlin. Institut für Physik. AG Theoretische Optik Photonik (Germany))
Quantum walks in dynamically-disordered networks have become an invaluable tool for understanding the physics of open quantum systems. Although much work has been carried out considering networks affected by diagonal disorder, it is of fundamental importance to study the effects of fluctuating couplings. [...]
2019 -  10.1088/1367-2630/ab1c79
New journal of physics, Vol. 21, Issue 5 (May 2019) , art. 053041
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2.
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27 p, 1.2 MB |
Stochastic thermodynamics of self-oscillations : the electron shuttle
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Wächtler, Christopher W. (Technical University Berlin. Institute of Theoretical Physics (Germany)) ;
Strasberg, Philipp (Universitat Autònoma de Barcelona. Departament de Física) ;
Klapp, Sabine H. L. (Technical University Berlin. Institute of Theoretical Physics (Germany)) ;
Schaller, Gernot (Technical University Berlin. Institute of Theoretical Physics (Germany)) ;
Jarzynski, Christopher (University of Maryland. Institute for Physical Science and Technology (USA))
Self-oscillation is a phenomenon studied across many scientific disciplines, including the engineering of efficient heat engines and electric generators. We investigate the single electron shuttle, a model nano-scale system that exhibits a spontaneous transition towards self-oscillation, from a thermodynamic perspective. [...]
2019 - 10.1088/1367-2630/ab2727
New journal of physics, Vol. 21, Issue 7 (July 2019) , art. 073009
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3.
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21 p, 1.4 MB |
Probabilistic metrology or how some measurement outcomes render ultra-precise estimates
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Calsamiglia Costa, John (Universitat Autònoma de Barcelona. Departament de Física) ;
Gendra Casalí, Bernat (Universitat Autònoma de Barcelona. Departament de Física) ;
Muñoz Tapia, Ramon (Universitat Autònoma de Barcelona. Departament de Física) ;
Bagán Capella, Emili (Universitat Autònoma de Barcelona. Departament de Física)
We show on theoretical grounds that, even in the presence of noise, probabilistic measurement strategies (which have a certain probability of failure or abstention) can provide, upon a heralded successful outcome, estimates with a precision that exceeds the deterministic bounds for the average precision. [...]
2016 - 10.1088/1367-2630/18/10/103049
New journal of physics, Vol. 18 (October 2016) , art. 103049
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4.
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13 p, 1.2 MB |
Acoustic phonon propagation in ultra-thin Si membranes under biaxial stress field
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Graczykowski, Bartlomiej (Institut Català de Nanociència i Nanotecnologia) ;
Gomis-Bresco, Jordi (Institut Català de Nanociència i Nanotecnologia) ;
Alzina, Francesc (Institut Català de Nanociència i Nanotecnologia) ;
Reparaz, Juan Sebastian (Institut Català de Nanociència i Nanotecnologia) ;
Shchepetov, Andrey (VTT Technical Research Centre of Finland) ;
Prunnila, Mika (VTT Technical Research Centre of Finland) ;
Ahopelto, Jouni (VTT Technical Research Centre of Finland) ;
Sotomayor Torres, Clivia M. (Institut Català de Nanociència i Nanotecnologia)
We report on stress induced changes in the dispersion relations of acoustic phonons propagating in 27 nm thick single crystalline Si membranes. The static tensile stress (up to 0. 3 GPa) acting on the Si membranes was achieved using an additional strain compensating silicon nitride frame. [...]
2014 - 10.1088/1367-2630/16/7/073024
New journal of physics, Vol. 16 (July 2014) , art. 73024
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5.
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16 p, 2.2 MB |
Metallic thin films on stepped surfaces : Lateral scattering of quantum well states
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Schiller, F. (Universidad del País Vasco. Centro de Física de Materiales) ;
El-Fattah, Z. M. Abd (Al-Azhar University. Physics Department) ;
Schirone, Stephano (Institut Català de Nanociència i Nanotecnologia) ;
Lobo Checa, J. (Universidad del País Vasco. Centro de Física de Materiales) ;
Urdanpilleta, M. (Universidad del País Vasco. Departamento de Física Aplicada) ;
Ruiz Osés, M. (Universidad del País Vasco. Departamento de Física Aplicada) ;
Cordón, J. (Universidad del País Vasco. Departamento de Física Aplicada) ;
Corso, Martina (Universidad del País Vasco. Centro de Física de Materiales) ;
Sanchez-Portal, Daniel (Universidad del País Vasco. Centro de Física de Materiales) ;
Mugarza, Aitor (Institut Català de Nanociència i Nanotecnologia) ;
Ortega, J. E. (Universidad del País Vasco. Centro de Física de Materiales)
Quantum well states of Ag films grown on stepped Au(111) surfaces are shown to undergo lateral scattering, in analogy with surface states of vicinal Ag(111). Applying angle resolved photoemission spectroscopy we observe quantum well bands with zone-folding and gap openings driven by surface/interface step lattice scattering. [...]
2014 - 10.1088/1367-2630/16/12/123025
New journal of physics, Vol. 16 (December 2014) , art. 123025
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6.
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9 p, 2.0 MB |
Structure and electronic states of vicinal Ag(111) surfaces with densely kinked steps
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Ortega Conejero, Enrique (Universidad del País Vasco. Departamento de Física Aplicada) ;
Vasseur, Guillaume (Donostia International Physics Centre) ;
Piquero Zulaica, Ignacio (Centro de Física de Materiales CSIC) ;
Matencio, Sonia (Institut Català de Nanociència i Nanotecnologia) ;
Valbuena, Miguel Ángel (Institut Català de Nanociència i Nanotecnologia) ;
Rault, Julien E. (Synchrotron SOLEIL) ;
Schiller, Frederik (Centro de Física de Materiales CSIC) ;
Corso, Martina (Centro de Física de Materiales CSIC) ;
Mugarza, Aitor (Institut Català de Nanociència i Nanotecnologia) ;
Lobo Checa, Jorge (Universidad de Zaragoza. Departamento de Física de la Materia Condensada)
Vicinal surfaces exhibiting arrays of atomic steps are frequently investigated due to their diverse physical-chemical properties and their use as growth templates. However, surfaces featuring steps with a large number of low-coordinated kink-atoms have been widely ignored, despite their higher potential for chemistry and catalysis. [...]
2018 - 10.1088/1367-2630/aacbb7
New journal of physics, Vol. 20 (July 2018) , art. 73010
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7.
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12 p, 8.4 MB |
Investigation of magneto-structural phase transition in FeRh by reflectivity and transmittance measurements in visible and near-infrared spectral region
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Saidl, V. (Univerzita Karlova (Praga, República Txeca)) ;
Brajer, M. (Univerzita Karlova (Praga, República Txeca)) ;
Horák, L. (Univerzita Karlova (Praga, República Txeca)) ;
Reichlová, H. (Akademie věd České republiky) ;
Výborný, K. (Akademie věd České republiky) ;
Veis, M. (Univerzita Karlova (Praga, República Txeca)) ;
Janda, T. (Univerzita Karlova (Praga, República Txeca)) ;
Trojánek, F. (Univerzita Karlova (Praga, República Txeca)) ;
Maryško, M. (Akademie věd České republiky) ;
Fina, Ignasi (Institut Català de Nanociència i Nanotecnologia) ;
Martí Rovirosa, Xavier (Institut Català de Nanociència i Nanotecnologia) ;
Jungwirth, Tomas (The University of Nottingham) ;
Němec, P. (Univerzita Karlova (Praga, República Txeca))
Magneto-structural phase transition in FeRh epitaxial layers was studied optically. It is shown that the transition between the low-temperature antiferromagnetic phase and the high-temperature ferromagnetic phase is accompanied by a rather large change of the optical response in the visible and near-infrared spectral ranges. [...]
2016 - 10.1088/1367-2630/18/8/083017
New journal of physics, Vol. 18 (August 2016) , art. 083017
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8.
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17 p, 934.7 KB |
Beating noise with abstention in state estimation
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Gendra Casalí, Bernat (Universitat Autònoma de Barcelona. Departament de Física) ;
Ronco Bonvehi, Elio (Universitat Autònoma de Barcelona. Departament de Física) ;
Calsamiglia Costa, John (Universitat Autònoma de Barcelona. Departament de Física) ;
Muñoz Tapia, Ramon (Universitat Autònoma de Barcelona. Departament de Física) ;
Bagán Capella, Emili (Universitat Autònoma de Barcelona. Departament de Física)
We address the problem of estimating pure qubit states with nonideal (noisy) measurements in the multiple-copy scenario, where the data consist of a number N of identically prepared qubits. We show that the average fidelity of the estimates can increase significantly if the estimation protocol allows for inconclusive answers, or abstentions. [...]
2012 - 10.1088/1367-2630/14/10/105015
New journal of physics, Vol. 14 (October 2012) , art. 105015
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9.
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9 p, 718.2 KB |
A quasistatic magnetic cloak
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Souc, Ján (Slovak Academy of Sciences. Institute of Electrical Engineering) ;
Solovyov, Mykola (Slovak Academy of Sciences. Institute of Electrical Engineering) ;
Gömöry, Fedor (Slovak Academy of Sciences. Institute of Electrical Engineering) ;
Prat Camps, Jordi (Universitat Autònoma de Barcelona. Departament de Física) ;
Navau Ros, Carles (Universitat Autònoma de Barcelona. Departament de Física) ;
Sánchez Moreno, Álvaro (Universitat Autònoma de Barcelona. Departament de Física)
Cloaking a three-dimensional object in free space from electromagnetic waves has recently become a theoretical possibility, although practical implementations can only be made in reduced schemes. If static fields are involved, requirements are less restrictive and some practical realizations have been possible. [...]
2013 - 10.1088/1367-2630/15/5/053019
New journal of physics, Vol. 15 (May 2013) , art. 053019
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