| dc.date.accessioned | 2013-09-30T09:53:21Z | |
| dc.date.available | 2013-09-30T09:53:21Z | |
| dc.date.issued | 2013 | |
| dc.identifier.uri | urn:nbn:de:hebis:34-2013093044056 | |
| dc.identifier.uri | http://hdl.handle.net/123456789/2013093044056 | |
| dc.description.sponsorship | Gefördert durch den Publikationsfonds der Universität Kassel | |
| dc.rights | Urheberrechtlich geschützt | |
| dc.rights.uri | https://rightsstatements.org/page/InC/1.0/ | |
| dc.subject | Computational physics | eng |
| dc.subject | Materials science | eng |
| dc.subject | Semiconductor physics | eng |
| dc.subject.ddc | 530 | |
| dc.title | Squeezed thermal phonons precurse nonthermal melting of silicon as a function of fluence | eng |
| dc.type | Aufsatz | |
| dcterms.abstract | A femtosecond-laser pulse can induce ultrafast nonthermal melting of various materials along pathways
that are inaccessible under thermodynamic conditions, but it is not known whether there is any structural
modification at fluences just below the melting threshold. Here, we show for silicon that in this regime the
room-temperature phonons become thermally squeezed, which is a process that has not been reported
before in this material. We find that the origin of this effect is the sudden femtosecond-laser-induced
softening of interatomic bonds, which can also be described in terms of a modification of the potential
energy surface. We further find in ab initio molecular-dynamics simulations on laser-excited potential
energy surfaces that the atoms move in the same directions during the first stages of nonthermal melting
and thermal phonon squeezing. Our results demonstrate how femtosecond-laser-induced coherent
fluctuations precurse complete atomic disordering as a function of fluence. The common underlying
bond-softening mechanism indicates that this relation between thermal squeezing and nonthermal melting
is not material specific. | eng |
| dcterms.accessRights | open access | |
| dcterms.bibliographicCitation | In: Physical review. X, Expanding access. College Park, Md. : APS, Vol. 3 (2013), 1, 011005, 1-8 | |
| dcterms.creator | Zijlstra, Eeuwe S. | |
| dcterms.creator | Kalitsov, Alan | |
| dcterms.creator | Zier, Tobias | |
| dcterms.creator | Garcia, Martin E. | |
| dc.relation.doi | doi:10.1103/PhysRevX.3.011005 | |
