Pablo Maldonado

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Relating to ‘‘Automating the weaning process with advanced closed-loop systems’’ by Dr. Burns et al. [1], we agree that clinical investigations are required to asses these systems in various patient populations; but with SmartCare there’s one additional concern to worry about. Computer-driven Protocolized Weaning from Mechanical Ventilation (SmartCare,(More)
Uncovering the physical mechanisms that govern ultrafast charge and spin dynamics is crucial for understanding correlated matter as well as the fundamental limits of ultrafast spin-based electronics. Spin dynamics in magnetic materials can be driven by ultrashort light pulses, resulting in a transient drop in magnetization within a few hundred femtoseconds.(More)
In spin-based electronics, information is encoded by the spin state of electron bunches. Processing this information requires the controlled transport of spin angular momentum through a solid, preferably at frequencies reaching the so far unexplored terahertz regime. Here, we demonstrate, by experiment and theory, that the temporal shape of femtosecond spin(More)
Irradiating a ferromagnet with a femtosecond laser pulse is known to induce an ultrafast demagnetization within a few hundred femtoseconds. Here we demonstrate that direct laser irradiation is in fact not essential for ultrafast demagnetization, and that electron cascades caused by hot electron currents accomplish it very efficiently. We optically excite a(More)
In the safety case for the geological disposal of nuclear waste, the release of radioactivity from the repository is controlled by the dissolution of the spent fuel in groundwater. There remain several uncertainties associated with understanding spent fuel dissolution, including the contribution of energetically reactive surface sites to the dissolution(More)
is claimed in ref. 1. Angular-resolved ellipsometry measurements on the sample would help to clarify the scenarios that are applicable here. Furthermore, the presence of artefacts in the Au layer would affect the electron mobility and have direct consequences for the modelling of a superdiffusive spin current. This goes beyond the scope of our(More)
1. Department of Physical Chemistry, Fritz Haber Institute, 14195 Berlin, Germany 2. Institute of Physics, Johannes Gutenberg University, 55128 Mainz, Germany 3. Singulus Technologies AG, 63796 Kahl am Main, Germany 4. Institute of Physics, Ernst Moritz Arndt University, 17489 Greifswald, Germany 5. Department of Physics, University of Maryland Baltimore(More)
On-surface assembly of a spin-bearing and non-aromatic porphyrin-related synthetic Co(II)-complex on a ferromagnetic Ni thin film substrate and subsequent magnetic exchange interaction across the interface were studied by scanning tunnelling microscopy (STM), X-ray absorption spectroscopy (XAS), X-ray magnetic circular dichroism (XMCD) and density(More)
Bose-Einstein condensates (BECs) composed of polarons would be an advance because they would combine coherently charge, spin, and a crystal lattice. Following our earlier report of unique structural and spectroscopic properties, we now identify potentially definitive evidence for polaronic BECs in photo- and chemically doped UO2(+x) on the basis of(More)
The advent of x-ray free electron lasers has extended the unique capabilities of resonant x-ray spectroscopy techniques to ultrafast time scales. Here, we report on a novel experimental method that allows retrieving with a single x-ray pulse the time evolution of an ultrafast process, not only at a few discrete time delays, but continuously over an extended(More)