Journal
PHYSICAL REVIEW LETTERS
Volume 120, Issue 18, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.120.185701
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Funding
- National Key Research and Development Program of China [2017YFB1104300]
- National Natural Science Foundation of China [61590930, 61775077, 11504368]
- 973 Program [2014CB921303]
- KBSI Grant [D37614]
- Department of Energy [DE-SC0002623]
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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(lg) optical phonon mode in which Ge and Te move out of phase. Upon damping of the A(1)g 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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