Directional Forces by Momentumless Excitation and Order-to-Order Transition in Peierls-Distorted Solids: The Case of GeTe.
Phys Rev Lett
; 120(18): 185701, 2018 May 04.
Article
in En
| MEDLINE
| ID: mdl-29775378
ABSTRACT
Time-dependent density-functional theory molecular dynamics reveals an unexpected effect of optical excitation in the experimentally observed rhombohedral-to-cubic transition of GeTe. The excitation induces coherent forces along [001], which may be attributed to the unique energy landscape of Peierls-distorted solids. The forces drive the A_{1g} optical phonon mode in which Ge and Te move out of phase. Upon damping of the A_{1g} mode, phase transition takes place, which involves no atomic diffusion, defect formation, or the nucleation and growth of the cubic phase.
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01-internacional
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MEDLINE
Language:
En
Journal:
Phys Rev Lett
Year:
2018
Document type:
Article
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