Publications (28)
Experimental realization of magnetic energy concentration and transmission at a distance by metamaterials
Jordi Prat-Camps, Carles Navau, Alvaro Sanchez
Controlling electromagnetic energy is essential for an efficient and sustainable society. A key requirement is concentrating magnetic energy in a desired volume of space in order t…
Negative permeability in magnetostatics and its experimental demonstration
Rosa Mach-Batlle, Albert Parra, Jordi Prat-Camps +3
The control of magnetic fields, essential for our science and technology, is currently achieved by magnetic materials with positive permeability, including ferromagnetic, paramagne…
Humanity's Last Exam
Long Phan, Alice Gatti, Ziwen Han +1144
Benchmarks are important tools for tracking the rapid advancements in large language model (LLM) capabilities. However, benchmarks are not keeping pace in difficulty: LLMs now achi…
Exact cloaking of uniform magnetic fields with a superconductor-magnetic bilayer
Carles Navau, Jordi Prat-Camps, Alvaro Sanchez
The experimental realization of cloaks for electromagnetic fields has been possible only in reduced schemes because of extreme material conditions required in exact cloaks. Here we…
Magnetic properties of superconducting multifilamentary tapes in perpendicular field. I: Model and vertical stacks
Alvaro Sanchez, Carles Navau, Enric Pardo
Current and field profiles, and magnetization and AC losses are calculated for an array of infinitely long superconducting tapes arranged vertically in a perpendicularly applied ma…
Two-dimensional arrays of superconducting strips as dc magnetic metamaterials
Yasunori Mawatari, Carles Navau, Alvaro Sanchez
We theoretically investigate the magnetic response of two-dimensional arrays of superconducting strips, which are regarded as essential structures of dc magnetic metamaterials. We…
Antimagnets: Controlling magnetic fields with superconductor-metamaterial hybrids
Alvaro Sanchez, Carles Navau, Jordi Prat +1
Magnetism is very important in science and technology, from magnetic recording to energy generation to trapping cold atoms. Physicists have managed to master magnetism - to create…
Self-fields in thin superconducting tapes: implications to the thickness effect in coated conductors
Alvaro Sanchez, Carles Navau, Nuria Del-Valle +1
Most applications of superconductors, such as power transmission lines, motors, generators, and transformers, require long cables through which large currents circulate. Impressive…
Critical-current density from magnetization loops of finite high-Tc superconductors
Alvaro Sanchez, Carles Navau
We analyze the effects of demagnetizing fields in the magnetization hysteresis loops of type-II superconductors, by a model that allows the calculation of current and field profile…
Complete and Robust Magnetic Field Confinement by Superconductors in Fusion Magnets
Natanael Bort-Soldevila, Jaume Cunill-Subiranas, Alvaro Sanchez
The fusion created by magnetically confined plasma is a promising clean and essentially unlimited future energy source. However, net energy generation has not been yet demonstrated…
Levitation of superconducting micro-rings for quantum magnetomechanics
Carles Navau, Stefan Minniberger, Michael Trupke +1
Levitation of superconductors is becoming an important building block in quantum technologies, particularly in the rising field of magnetomechanics. In most of the theoretical prop…
Feedback between population and evolutionary dynamics determines the fate of social microbial populations
Alvaro Sanchez, Jeff Gore
The evolutionary spread of cheater strategies can destabilize populations engaging in cooperative behaviors, thus demonstrating that evolutionary changes can have profound implicat…
Available energy fluxes drive a transition in the diversity, stability, and functional structure of microbial communities
Robert Marsland, Wenping Cui, Joshua Goldford +3
A fundamental goal of microbial ecology is to understand what determines the diversity, stability, and structure of microbial ecosystems. The microbial context poses special concep…
Magnetic properties of superconducting multifilamentary tapes in perpendicular field. II: Horizontal and matrix arrays
Enric Pardo, Carles Navau, Alvaro Sanchez
Current and field profiles, and magnetization and ac losses are calculated for arrays of infinitely long superconducting tapes in the critical state in a perpendicularly applied ma…
Global epistasis on fitness landscapes
Juan Diaz-Colunga, Abigail Skwara, Karna Gowda +4
Epistatic interactions between mutations add substantial complexity to adaptive landscapes, and are often thought of as detrimental to our ability to predict evolution. Yet, patter…
Imprinting skyrmions in thin films by ferromagnetic and superconducting templates
Nuria Del-Valle, Sebastia Agramunt-Puig, Carles Navau +1
Magnetic skyrmions are promising candidates as information carriers in a new generation of memories. How to generate and stabilize skyrmions is essential for their successful appli…
Effect of promoter architecture on the cell-to-cell variability in gene expression
Alvaro Sanchez, Hernan Garcia, Daniel Jones +2
According to recent experimental evidence, the architecture of a promoter, defined as the number, strength and regulatory role of the operators that control the promoter, plays a m…
Mechanical frequency control in inductively coupled electromechanical systems
Thomas Luschmann, Philip Schmidt, Frank Deppe +4
Nano-electromechanical systems implement the opto-mechanical interaction combining electromagnetic circuits and mechanical elements. We investigate an inductively coupled nano-elec…
The homology of the groupoid of the self-similar dihedral group
Eduard Ortega, Alvaro Sanchez
We give an example of a locally compact effective Hausdorff, minimal ample groupoid such that its rational homology differs from the -theory of its reduced groupoid -algebr…
Magnetic energy harvesting and concentration at distance by transformation optics
Carles Navau, Jordi-Prat Camps, Alvaro Sanchez
Magnetic energy is one the main agents powering our society: generating energy in power plants, keeping information in magnetic memories, moving our devices with motors. All of the…
Dynamics of a producer-parasite ecosystem on the brink of collapse
Andrew Chen, Alvaro Sanchez, Lei Dai +1
Ecosystems can undergo sudden shifts to undesirable states, but recent studies with simple single species ecosystems have demonstrated that advance warning can be provided by the s…
Stiffness and energy losses in cylindrically symmetric superconductor levitating systems
Carles Navau, Alvaro Sanchez
Stiffness and hysteretic energy losses are calculated for a magnetically levitating system composed of a type-II superconductor and a permanent magnet when a small vibration is pro…
Computation Of Microbial Ecosystems in Time and Space (COMETS): An open source collaborative platform for modeling ecosystems metabolism
Ilija Dukovski, Djordje BajiÄ, Jeremy M Chacón +10
Genome-scale stoichiometric modeling of metabolism has become a standard systems biology tool for modeling cellular physiology and growth. Extensions of this approach are also emer…
Deciphering transcriptional dynamics in vivo by counting nascent RNA molecules
Sandeep Choubey, Jane Kondev, Alvaro Sanchez
Transcription of genes is the focus of most forms of regulation of gene expression. Even though careful biochemical experimentation has revealed the molecular mechanisms of transcr…
Magnetic illusion: transforming a magnetic object into another object by negative permeability
Rosa Mach-Batlle, Albert Parra, Sergi Laut +3
We theoretically predict and experimentally verify the illusion of transforming the magnetic signature of a 3D object into that of another arbitrary object. This is done by employi…
Long-Distance Transfer and Routing of Static Magnetic Fields
Carles Navau, Jordi Prat-Camps, Oriol Romero-Isart +2
We show how the static magnetic field of a finite source can be transferred and routed to arbitrary long distances. This is achieved by using transformation optics, which results i…
Accelerating, guiding, and compressing skyrmions by defect rails
Josep Castell-Queralt, Leonardo G. González-Gómez, Nuria Del-Valle +2
Magnetic skyrmions are promising candidates as information carriers in spintronic devices. The transport of individual skyrmions in a fast and controlled way is a key issue in this…
Shaping Magnetic Fields with Zero-Magnetic-Permeability Media
Alvaro Sanchez, Natanael Bort-Soldevila
Some of the most important technological challenges of today's society, such as fusion reactors for future clean unlimited energy or the next generation of medical imaging techniqu…