Polarization Vortices in Germanium Telluride Nanoplatelets: A Theoretical Study
(2009) Physical Review Letters — Vol. 103, n° 24, p. 247601 : 1-4 (2009)
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- 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.
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Durgun, E., Ghosez, Ph., Shaltaf, R., Gonze, X., & Raty, J.-Y. (2009). Polarization Vortices in Germanium Telluride Nanoplatelets: A Theoretical Study. Physical Review Letters, 103(24), 247601 : 1-4. https://doi.org/10.1103/PhysRevLett.103.247601 (Original work published 2009)