Selected Publications
My research focuses on epitaxial thin films of correlated oxides, with emphasis on vanadium Magnéli phases as model systems to study extended metal–insulator transitions. This work connects synthesis, crystallographic registry, transport, and device-relevant switching phenomena in quantum materials.
Magnéli Phases (Core Program)
J. Appl. Phys. 139, 104502 (2026)
Superlattice Reflection Signatures of the Insulator–Metal Transition in V₃O₅ Thin Films
Structural signature of the extended MIT in epitaxial V₃O₅ thin films.
J. Appl. Phys. 137, 234504 (2025)
High-frequency electrical behavior in V₃O₅ thin films
Demonstrates device-relevant RF response (5–35 GHz) in V₃O₅, extending its functionality into high-frequency electronics.
Adv. Electron. Mater. 11, 2400539 (2025)
Photoinduced Melting of V₄O₇ Correlated State
Ultrafast collapse of the correlated state in V₄O₇.
J. Appl. Phys. 136, 125109 (2024)
Light scattering by V₄O₇ film across the metal–insulator transition
Direct optical probe of phase evolution across the MIT.
Adv. Mater. 35, 2208477 (2023)
Physical Origin of Negative Differential Resistance in V₃O₅ and Its Application as a Solid-State Oscillator
Establishes V₃O₅ as a platform for phase-change electronic and oscillator-based devices.
J. Appl. Phys.129, 025111 (2021)
Raman spectra and elastic light scattering dynamics of V₃O₅ across insulator–metal transition
Identifies optical signatures of MIT dynamics in V₃O₅ thin films.
Devices and Neuromorphic Systems
Adv. Mater. 36, 2400904 (2024).
Optically Tunable Electrical Oscillation in Oxide-based Memristors for Neuromorphic Computing
Demonstrates neuromorphic functionality in oxide-based memristive systems.
ACS Appl. Mater. Interfaces 16, 31283 (2024)
Biorealistic Neuronal Temperature-Sensitive Dynamics within Threshold Switching Memristors
Demonstrates temperature-sensitive switching dynamics relevant to neuromorphic thermosensation.
Adv. Intell. Syst. 6, 2400191 (2024)
Dynamics of Leaky Integrate-and-Fire Neurons Based on Oxyvanite Memristors for Spiking Neural Networks
Demonstrates spiking-neuron behavior in oxide memristive devices.
Canonical MIT Systems (VO₂, V₂O₃)
Nat. Commun.11, 1690 (2020)
Large non-thermal generation of picosecond strain pulses during ultrafast photoinduced phase transition in vanadium dioxide
Demonstrates ultrafast non-thermal strain generation across the VO₂ transition.
Phys. Rev. Mater.4, 125201 (2020)
Photoelasticity of VO₂ nanolayers in insulating and metallic phases studied by picosecond ultrasonics
Demonstrates the photoelastic response of VO₂ across the MIT.
J. Appl. Phys.124, 205301 (2018)
Toward reproducible metal-insulator transition characteristics in V₂O₃ thin films sputter-deposited on glass
Establishes reproducible MIT behavior in V₂O₃ thin films.
These publications establish epitaxial Magnéli phases as a platform to study extended metal–insulator transitions and demonstrate their implementation in electronic and high-frequency devices.
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Microactuadores basados en materiales de transición de aislante a metal y método de uso de los mismos.
R. Cabrera, F.E. Fernandez, A. Rúa, and N. Sepulveda
U.S. Patent 8835861 B1. Issued: 16 Sep 2014.
Disposición en voladizo bimorfo y sus aplicaciones
F. E. Fernández, N. Sepulveda, A. Rúa, and R. Cabrera,
U.S. Patent No. 8,440,931 B1. Issued: May 14, 2013.