CMSP Seminar (Atomistic Simulation Seminar Series) 19 July, 11:00hrs, Riccardo Mazzarello

[CMSP Seminars Secretariat]

------------------------------------------------------------------------
CMSP Seminar (Atomistic Simulation Seminar Series)
-------------------------------------------------------------------------

*Wednesday, 19 July 2023, 11:00 hrs*
*IN PERSON: /Luigi Stasi Seminar Room (Leonardo Building, second floor)/*/
/

/Zoom registration link: 
https://zoom.us/meeting/register/tJcvfu2grjkqG9XuvhBEPpQG4K2RNSXB3zvm
/

Speaker: *Riccardo Mazzarello* (Department of Physics, Sapienza 
University of Rome)

Title: *Atomistic study of the configurational entropy and the fragility 
of supercooled liquid GeTe***

Abstract:

Phase-change materials (PCMs) are an important family of alloys employed 
in non-volatile memories and neuromorphic devices. These devices exploit 
the ability of PCMs to undergo rapid and reversible transitions between 
crystalline and amorphous phases at high temperature. At ambient 
conditions, both phases are very stable. These properties imply a strong 
temperature dependence of the crystallization kinetics, which is 
attributed to the high fragility of the supercooled liquid phase. In 
this work, we conduct molecular dynamics simulations based on a neural 
network potential to investigate the potential energy landscape of 
liquid GeTe, a prototypical PCM. We also compute the configurational 
entropy as a function of temperature in the deeply supercooled regime. 
We also calculate the viscosity and the relaxation times in the same 
temperature range. Finally, we use the Adam-Gibbs equation to 
extrapolate the data down to the glass transition temperature and 
estimate the fragility.

-- 


CMSP, Condensed Matter & Statistical Physics Section
http://www.ictp.it/research/cmsp.aspx

The Abdus Salam International Centre for Theoretical Physics
https://www.ictp.it/

    
----