Memory emergence in nonlinear systems and nanodevices

• Grant number: 23/05436-3
• Support Opportunities: Scholarships in Brazil - Doctorate
• Start date: September 01, 2023
• End date: August 31, 2027
• Field of knowledge: Physical Sciences and Mathematics - Physics - Condensed Matter Physics
• Principal Investigator: Victor Lopez Richard
• Grantee: Rafael Schio Wengenroth Silva
• Host Institution: Centro de Ciências Exatas e de Tecnologia (CCET). Universidade Federal de São Carlos (UFSCAR). São Carlos , SP, Brazil

Abstract

Memristive systems, or devices with intrinsic memory in general, are center pieces of a challenging and topical scientific field. They serve as grounds of promising technological breakthroughs for advanced computation, data security, and mobile communication. Building and exploiting theoretical models for studying the fundamental ingredients for memory emergence and how they intertwine to get it tuned with intrinsic and extrinsic factors is the scope of the current thesis. Various platforms, ranging from bulk semiconductors oxides towards nanoscopic coupled quantum dots, will be tackled sequentially. The proposal is tightly connected with synergic experimental efforts of our colleagues during the design, growth, characterization, and application of devices. The effect of symmetry constraints (or the lack of them), temperature, illumination, and shapes of voltage drives can be proven to play a decisive role in the nature of the memory emergence and this will be both theoretically and experimentally unveiled in a systematic way in all the systems analyzed. Beyond the device driven studies, the current proposal will also tackle methodological discussions for the impedance spectroscopy characterization of metamaterials and nonlinear systems. The idea is to reduce the seeming complexity of frequency-dependent impedance to a combination of basic microscopic ingredients trying to match a vast universe of experimental evidences. This analytical approach would create a paradigm for impedance spectroscopy studies with impact in physics, electrochemistry, nanotechnology, and engineering. (AU)

Scientific publications

(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)

LOPEZ-RICHARD, VICTOR; PRADHAN, SOUMEN; WENGENROTH SILVA, RAFAEL SCHIO; LIPAN, OVIDIU; CASTELANO, LEONARDO K.; HOEFLING, SVEN; HARTMANN, FABIAN. Beyond equivalent circuit representations in nonlinear systems with inherent memory. Journal of Applied Physics, v. 136, n. 16, p. 9-pg., 2024-10-28. (23/05436-3)

SILVA, ANA LUIZA COSTA; SILVA, RAFAEL SCHIO WENGENROTH; MOISES, LUCAS AUGUSTO; CHIQUITO, ADENILSON JOSE; DE GODOY, MARCIO PERON FRANCO; HARTMANN, FABIAN; LOPEZ-RICHARD, VICTOR. From Memory Traces to Surface Chemistry: Decoding REDOX Reactions. ACS APPLIED ELECTRONIC MATERIALS, v. 7, n. 4, p. 9-pg., 2025-02-17. (23/17490-2, 23/05436-3)

LOPEZ-RICHARD, VICTOR; PRADHAN, SOUMEN; CASTELANO, LEONARDO K.; WENGENROTH SILVA, RAFAEL SCHIO; LIPAN, OVIDIU; HOEFLING, SVEN; HARTMANN, FABIAN. Accuracy bottlenecks in impedance spectroscopy due to transient effects. Journal of Applied Physics, v. 136, n. 16, p. 11-pg., 2024-10-28. (23/05436-3)