Photoexcitation Induced Ultrafast Nonthermal Amorphization in Sb2 Te3

The Journal of Physical Chemistry Letters
Subodh TiwariPaulo S Branicio

Abstract

Phase-change materials are of great interest for low-power high-throughput storage devices in next-generation neuromorphic computing technologies. Their operation is based on the contrasting properties of their amorphous and crystalline phases, which can be switched on the nanosecond time scale. Among the archetypal phase change materials based on Ge-Sb-Te alloys, Sb2Te3 displays a fast and energy-efficient crystallization-amorphization cycle due to its growth-dominated crystallization and low melting point. This growth-dominated crystallization contrasts with the nucleation-dominated crystallization of Ge2Sb2Te5. Here, we show that the energy required for and the time associated with the amorphization process can be further reduced by using a photoexcitation-based nonthermal path. We employ nonadiabatic quantum molecular dynamics simulations to investigate the time evolution of Sb2Te3 with 2.6, 5.2, 7.5, 10.3, and 12.5% photoexcited valence electron-hole carriers. Results reveal that the degree of amorphization increases with excitation, saturating at 10.3% excitation. The rapid amorphization originates from an instantaneous charge transfer from Te-p orbitals to Sb-p orbitals upon photoexcitation. Subsequent evolution of the e...Continue Reading

References

Dec 15, 1994·Physical Review. B, Condensed Matter·P E Blöchl
Nov 1, 1992·Physical Review. B, Condensed Matter·P Stampfli, K H Bennemann
Nov 25, 1985·Physical Review Letters·R Car, M Parrinello
Aug 19, 1991·Physical Review Letters·P SaetaE Mazur
Oct 28, 1996·Physical Review Letters·J P PerdewM Ernzerhof
Nov 13, 1999·Science·C W SidersC P Barty
Apr 11, 2006·Nature Materials·Hendrik F HamannH Kumar Wickramasinghe
Sep 7, 2006·Journal of Computational Chemistry·Stefan Grimme
Nov 2, 2007·Nature Materials·Matthias Wuttig, Noboru Yamada
Jun 4, 2008·Physical Review Letters·Maher HarbR J Dwayne Miller
Jul 16, 2008·Nature Materials·Kostiantyn ShportkoMatthias Wuttig
Jun 25, 2009·Proceedings of the National Academy of Sciences of the United States of America·Dmitry ShakhvorostovMartin H Müser
Sep 1, 2009·Chemical Reviews·Simone RaouxDaniele Ielmini
Jul 5, 2011·Nature Nanotechnology·R E SimpsonJ Tominaga
Mar 4, 2009·Journal of Physics. Condensed Matter : an Institute of Physics Journal·G C SossoM Bernasconi
Jun 23, 2012·Science·D LokeS R Elliott
Feb 26, 2013·Physical Review Letters·Elisabeth M BothschafterRalph Ernstorfer
Aug 9, 2013·Advanced Materials·Eeuwe S ZijlstraMartin E Garcia
Oct 29, 2014·Nature Neuroscience·Jeff W LichtmanNir Shavit
Jun 5, 2015·ACS Applied Materials & Interfaces·Jonathan M SkeltonStephen R Elliott
Sep 24, 2015·Nature Materials·Sergei V KalininRichard K Archibald
Jan 23, 2016·Structural Dynamics·Tobias ZierMartin E Garcia
Jun 30, 2018·Nature Communications·Irem BoybatEvangelos Eleftheriou
Nov 27, 2018·Advanced Materials·Jean-Yves RatyMatthias Wuttig
Dec 7, 2018·ACS Applied Materials & Interfaces·Desmond K LokeStephen R Elliott
Jan 4, 2020·Nature Communications·Chao LianSheng Meng
Mar 7, 2020·Journal of the American Chemical Society·Sebastian KlemenzLeslie M Schoop

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Citations

Jul 10, 2021·The Journal of Physical Chemistry Letters·Tianpei GeQun Xu

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