Thermal stability and topological charge fragmentation in antiskyrmions of rhombohedral barium titanate

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378271%3A_____%2F25%3A00638748" target="_blank" >RIV/68378271:_____/25:00638748 - isvavai.cz</a>

Výsledek na webu

<a href="https://hdl.handle.net/11104/0369398" target="_blank" >https://hdl.handle.net/11104/0369398</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1103/PhysRevB.111.174106" target="_blank" >10.1103/PhysRevB.111.174106</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Thermal stability and topological charge fragmentation in antiskyrmions of rhombohedral barium titanate

Popis výsledku v původním jazyce

Antiskyrmions, as topological quasiparticles, hold significant promise for spintronics and nanoscale data storage applications. Using molecular dynamics simulations based on effective Hamiltonians, we investigated the thermal stability of antiskyrmion nanodomains in rhombohedral barium titanate. At 1 K, antiskyrmions with a topological charge of -2 were found to be the most stable nanodomain state across all diameters examined by us. In our systematic study, the most robust antiskyrmion was found to have a diameter of 4 nm, maintaining its original size, shape, and topological charge up to the characteristic temperature T* ≈ 85 K. Domains with diameters between 2.8 and approximately 4.5 nm exhibited fragmentation into six topological defects, termed quarks, each carrying a fractional skyrmion charge of -1/3. For domains larger than 4.5 nm, each topological quark split into two prequarks, each with a charge of -1/6. These larger nanodomains demonstrated increased mobility and a growing tendency for shape and skyrmion charge fluctuations. Above the T* temperature, all larger nanodomains gradually shrank to a diameter of about 4 nm before collapsing into a single-domain state. These findings reveal the relatively high stability of antiskyrmions over a broad temperature range, even in the absence of a stabilizing bias field, and emphasize the pivotal role of topological quark dynamics. This establishes barium titanate as a key platform for exploring and applying topological phenomena.

Název v anglickém jazyce

Thermal stability and topological charge fragmentation in antiskyrmions of rhombohedral barium titanate

Popis výsledku anglicky

Antiskyrmions, as topological quasiparticles, hold significant promise for spintronics and nanoscale data storage applications. Using molecular dynamics simulations based on effective Hamiltonians, we investigated the thermal stability of antiskyrmion nanodomains in rhombohedral barium titanate. At 1 K, antiskyrmions with a topological charge of -2 were found to be the most stable nanodomain state across all diameters examined by us. In our systematic study, the most robust antiskyrmion was found to have a diameter of 4 nm, maintaining its original size, shape, and topological charge up to the characteristic temperature T* ≈ 85 K. Domains with diameters between 2.8 and approximately 4.5 nm exhibited fragmentation into six topological defects, termed quarks, each carrying a fractional skyrmion charge of -1/3. For domains larger than 4.5 nm, each topological quark split into two prequarks, each with a charge of -1/6. These larger nanodomains demonstrated increased mobility and a growing tendency for shape and skyrmion charge fluctuations. Above the T* temperature, all larger nanodomains gradually shrank to a diameter of about 4 nm before collapsing into a single-domain state. These findings reveal the relatively high stability of antiskyrmions over a broad temperature range, even in the absence of a stabilizing bias field, and emphasize the pivotal role of topological quark dynamics. This establishes barium titanate as a key platform for exploring and applying topological phenomena.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10302 - Condensed matter physics (including formerly solid state physics, supercond.)

Projekt

<a href="/cs/project/GX19-28594X" target="_blank" >GX19-28594X: Feroelektrické skyrmiony</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2025

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Physical Review B

ISSN

2469-9950

e-ISSN

2469-9969

Svazek periodika

111

Číslo periodika v rámci svazku

17

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

10

Strana od-do

174106

Kód UT WoS článku

001494567700005

EID výsledku v databázi Scopus

2-s2.0-105005154098