Polarization vortices in germanium telluride nanoplatelets: A theoretical study

E. Durgun, Ph Ghosez, R. Shaltaf, X. Gonze, J. Y. Raty

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)

Abstract

Using first-principles calculations based on density functional theory, we study the properties of germanium telluride crystalline nanoplatelets and nanoparticles. Above a diameter of 2.7 nm, we predict the appearance of polarization vortices giving rise to an unusual ferrotoroidic ground state with a spontaneous and reversible toroidal moment of polarization. We highlight the crucial role of inhomogeneous strain in stabilizing polarization vortices. Combined with the phase-change properties of germanium telluride, the ferrotoroidic properties could be of practical interest for ternary logic applications.

Original languageEnglish
Article number247601
JournalPhysical Review Letters
Volume103
Issue number24
DOIs
Publication statusPublished - 7 Dec 2009
Externally publishedYes

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