Lucas J. Fernández-Alcázar

Lucas J. Fernández-Alcázar
National Scientific and Technical Research Council | conicet · IMIT Instituto de Modelado e Innovación Tecnológica

Ph.D. in Physics - University of Cordoba - Argentina
Assistant Researcher at the Institute of Modelling and Innovation on Technology CONICET (Argentina)

About

25
Publications
2,234
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162
Citations
Introduction
I'm Lucas J. Fernández-Alcázar, Assistant Researcher at CONICET in Corrientes, Argentina. My research interest lies in the interface between Photonics and Optics, Condensed Matter, and Quantum Mechanics. Specifically, I'm interested in the transport of wavelike excitations (electrons, photons, phonons, etc. ) in the micro and nanoscale in complex systems.
Additional affiliations
April 2021 - present
National Scientific and Technical Research Council
Position
  • Research Assistant
Description
  • Research Assistant in CONICET
May 2018 - July 2020
Wesleyan University
Position
  • PostDoc Position
Description
  • Postdoc position at the Wave Transport in Complex System's Group. - PI: Tsampikos Kottos
April 2016 - May 2018
National Scientific and Technical Research Council
Position
  • PostDoc Position
Description
  • Postdoc Position
Education
April 2011 - March 2016
March 2006 - March 2011

Publications

Publications (25)
Preprint
Full-text available
We control the direction and magnitude of thermal radiation, between two bodies at equal temperature (in thermal equilibrium), by invoking the concept of adiabatic pumping. Specifically, within a resonant near-field electromagnetic heat transfer framework, we utilize an {\it instantaneous} scattering matrix approach to unveil the critical role of w...
Article
Full-text available
We investigate the collective dynamics of nonlinearly interacting modes in multimode photonic settings. To this end, we have established a connection with the theory of spin networks. The emerging “photonic spins” are complex, soft (their size is not fixed), and their dynamics has two constants of motion. Our analysis sheds light on the nature of t...
Article
Full-text available
Exceptional point degeneracies, occurring in non-Hermitian systems, have challenged many well established concepts and led to the development of remarkable technologies. Here, we propose a family of autonomous motors whose operational principle relies on exceptional points via the opportune implementation of a (pseudo-)PT-symmetry and its spontaneo...
Preprint
Full-text available
We develop, within a near-field thermal radiation framework, a Floquet scattering approach that establishes a reconfigurable control of the direction of thermal radiation between reservoirs. The method promotes a connection with Floquet engineering -- originally developed in many-body physics -- thus allowing us to design periodically driven photon...
Article
Full-text available
Decoherent transport in mesoscopic and nanoscopic systems can be formulated in terms of the D'Amato–Pastawski (DP) model. This generalizes the Landauer–Büttiker picture by considering a distribution of local decoherent processes. However, its generalization for multi-terminal set-ups is lacking. We first review the original two-terminal DP model fo...
Article
Full-text available
We show analytically that the molecular dissociation occurring in a Heyrovsky reaction can be interpreted as a Quantum Dynamical Phase Transition, i.e. an analytical discontinuity in the molecular energy spectrum. Through appropriate election of the molecular orbital basis, it is shown that the metallic substrate plays the role of an environment th...
Preprint
Full-text available
Through an appropriate election of the molecular orbital basis, we show analytically that the molecular dissociation occurring in a Heyrovsky reaction can be interpreted as a Quantum Dynamical Phase Transition, i.e., an analytical discontinuity in the molecular energy spectrum induced by the catalyst. The metallic substrate plays the role of an env...
Preprint
Full-text available
We numerically implement the concept of thermal radiation pumps in realistic photonic circuits and demonstrate their efficiency to control the radiation current, emitted between two reservoirs with equal temperature. The proposed pumping scheme involves a cyclic adiabatic modulation of two parameters that control the spectral characteristics of the...
Article
A stationary inflection point (SIP) of the Bloch dispersion relation of a periodic system is a prominent example of an exceptional point degeneracy (EPD) where three Bloch eigenmodes coalesce. The scattering problem for a bounded photonic structure supporting a SIP features the frozen mode regime (FMR), where the incident wave is converted into the...
Article
By using Floquet driving protocols and interlacing them with a judicious reservoir emission engineering, we achieve extreme nonreciprocal thermal radiation. We show that the latter is rooted in an interplay between a direct radiation process occurring due to temperature bias between two thermal baths and the modulation process that is responsible f...
Article
Full-text available
In recent years, there has been an increasing interest in nanoelectromechanical devices, current-driven quantum machines, and the mechanical effects of electric currents on nanoscale conductors. Here, we carry out a thorough study of the current-induced forces and the electronic friction of systems whose electronic effective Hamiltonian can be desc...
Preprint
Full-text available
In recent years, there has been an increasing interest in nanoelectromechanical devices, current-driven quantum machines, and the mechanical effects of electric currents on nanoscale conductors. Here, we carry out a thorough study of the current-induced forces and the electronic friction of systems whose electronic effective Hamiltonian can be desc...
Preprint
Full-text available
A thermal current, generated by a temperature gradient between two reservoirs coupled to a carefully designed photonic or (micro-) electromechanical circuit, might induce non-conservative forces that impulse a mechanical degree of freedom to move along a closed trajectory. We show that in the limit of long - but finite - modulation periods, the ext...
Article
Full-text available
Scattering processes are typically sensitive to the incident wave properties and to interference effects generated via wave-matter interactions with the target. We challenge this general belief in the case of targets that undergo time-periodic modulations encircling quasiadiabatically an exceptional point in a given parameter space. When the scatte...
Article
We control the direction and magnitude of thermal radiation, between two bodies at equal temperature (in thermal equilibrium), by invoking the concept of adiabatic pumping. Specifically, within a resonant near-field electromagnetic heat transfer framework, we utilize an instantaneous scattering matrix approach to unveil the critical role of wave in...
Article
Full-text available
In recent years, there has been an increasing interest in nanomachines. Among them, current-driven ones deserve special attention as quantum effects can play a significant role there. Examples of the latter are the so-called adiabatic quantum motors. In this paper, we propose using Anderson's localization to induce nonequilibrium forces in adiabati...
Preprint
Full-text available
In recent years there has been an increasing interest in nanomachines. Among them, current-driven ones deserve special attention as quantum effects can play a significant role there. Examples of the latter are the so-called adiabatic quantum motors. In this work, we propose using Anderson's localization to induce nonequilibrium forces in adiabatic...
Article
Full-text available
Different proposals for adiabatic quantum motors (AQMs) driven by DC currents have recently attracted considerable interest. However, the systems studied are often based on simplified models with highly ideal conditions where the environment is neglected. Here, we investigate the performance (dynamics, efficiency, and output power) of a prototypica...
Article
Full-text available
Current induced forces are not only related with the discrete nature of electrons but also with its quantum character. It is natural then to wonder about the effect of decoherence. Here, we develop the theory of current induced forces including dephasing processes and we apply it to study adiabatic quantum motors (AQMs). The theory is based on B\"u...
Article
Full-text available
We present a model for decoherence in time-dependent transport. It boils down into a form of wave function that undergoes a smooth stochastic drift of the phase in a local basis, the Quantum Drift (QD) model. This drift is nothing else but a local energy fluctuation. Unlike Quantum Jumps (QJ) models, no jumps are present in the density as the evolu...
Article
Full-text available
We describe the spin-dependent quantum conductance in a wire where a magnetic field is spatially modulated. The change in direction and intensity of the magnetic field acts as a perturbation that mixes spin projections. This is exemplified by a ferromagnetic nanowire. There the local field varies smoothly its direction generating a domain wall (DW)...
Article
Full-text available
Decoherent transport in mesoscopic and nanoscopic systems can be formulated in terms of the D'Amato-Pastawski (DP) model. This generalizes the Landauer-B\"{u}ttiker picture by considering a distribution of decoherent local scattering centers of decoherence. However, its generalization for multiterminal setups is lacking. We first review the origina...
Article
Full-text available
We address the spin-dependent electronic transport through regions where there is a spatially modulated magnetic field. We model and solve an illustrative example: a ferromagnetic nano-wire with a single domain wall (DW) whose finite width where the local field rotates while it modifies its intensity. There is a trivial case where the electrons whi...

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Projects

Projects (3)
Project
In this project, we study the phenomena arising from the coupling between a flux of quantum particles and a classical degree of freedom. In particular, we focus on current-induced forces, electronic friction, quantum pumping, and geometric rectification. We study those phenomena from a fundamental point of view but also seeking new proposals for nanodevices such as nanomotors or nanoscale energy harvesters.
Project
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