др Марко Младеновић

20. маја 2022.

У оквиру семинара Центра за изучавање комплексних система Института за физику у Београду, у четвртак, 26. маја 2022. године у 14 часова путем Zoom платформе, др Марко Младеновић (Лабораторија за интегрисане системе, ЕТХ, Цирих), одржаће предавање:

Fully-atomistic simulations of valence change memories


The ability to vary their conductance makes valence change memories (VCMs) promising candidates for applications in emerging neuromorphic applications [1]. The operational mechanism of VCMs is based on the arrangement of oxygen vacancies in the presence of applied voltage: if a conductive path consisting of oxygen vacancies is established between two electrodes, the VCM is in its low resistance (ON) state, if the conductive path is broken, the system is in its high resistance (OFF) state. In this talk, a theoretical framework to model VCMs will be presented. The model is fully-atomistic and consists of three steps: (1) calculating the activation energies for events that occur in VCMs using density functional theory calculations; (2) simulating the rearrangement of oxygen vacancies using an in-house kinetic Monte Carlo code; and (3) calculating the transport properties using the quantum transport method based on non-equilibrium Green’s function formalism. Following a detailed description of the method, an overview of the results on hafnium oxide-based VCMs will be given.

[1] K.Portner et al, ACS Nano 15, 14776 (2021).

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Meeting ID: 810 5550 6980
Passcode: 683804