Ultrafast Control of the electronic phase of a manganite viamode-selective vibrational excitation

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Controlling a phase of matter by coherently manipulatingspecific vibrational modes has long been an attractive (yet elusive) goalfor ultrafast science. Solids with strongly correlated electrons, inwhich even subtle crystallographic distortions can result in colossalchanges of the electronic and magnetic properties, could be directedbetween competing phases by such selective vibrational excitation. Inthis way, the dynamics of the electronic ground state of the systembecome accessible, and new insight into the underlying physics might begained. Here we report the ultrafast switching of the electronic phase ofa magnetoresistive manganite via direct excitation of a phonon mode at 71meV (17 THz). A prompt, five-order-of-magnitude drop ... continued below

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Rini, Matteo; Tobey, Ra'anan I.; Dean, Nicky; Tokura, Yoshinori; Schoenlein, Robert W. & Cavalleri, Andrea May 1, 2007.

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Controlling a phase of matter by coherently manipulatingspecific vibrational modes has long been an attractive (yet elusive) goalfor ultrafast science. Solids with strongly correlated electrons, inwhich even subtle crystallographic distortions can result in colossalchanges of the electronic and magnetic properties, could be directedbetween competing phases by such selective vibrational excitation. Inthis way, the dynamics of the electronic ground state of the systembecome accessible, and new insight into the underlying physics might begained. Here we report the ultrafast switching of the electronic phase ofa magnetoresistive manganite via direct excitation of a phonon mode at 71meV (17 THz). A prompt, five-order-of-magnitude drop in resistivity isobserved, associated with a non-equilibrium transition from the stableinsulating phase to a metastable metallic phase. In contrast withlight-induced, and current-driven phase transitions, the vibrationallydriven bandgap collapse observed here is not related to hot-carrierinjection and is uniquely attributed to a large-amplitude Mn-Odistortion. This corresponds to a perturbation of theperovskite-structure tolerance factor, which in turn controls theelectronic bandwidth via inter-site orbital overlap. Phase control bycoherent manipulation of selected metal--oxygen phonons should findextensive application in other complex solids--notably in copper oxidesuperconductors, in which the role of Cu-O vibrations on the electronicproperties is currently controversial.

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  • Journal Name: Nature; Journal Volume: 449; Journal Issue: 7158; Related Information: Journal Publication Date: 09/06/2007

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  • Report No.: LBNL--63433
  • Grant Number: DE-AC02-05CH11231
  • DOI: 10.1038/nature06119 | External Link
  • Office of Scientific & Technical Information Report Number: 929391
  • Archival Resource Key: ark:/67531/metadc900442

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  • May 1, 2007

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  • Sept. 27, 2016, 1:39 a.m.

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  • Oct. 31, 2016, 3:59 p.m.

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Rini, Matteo; Tobey, Ra'anan I.; Dean, Nicky; Tokura, Yoshinori; Schoenlein, Robert W. & Cavalleri, Andrea. Ultrafast Control of the electronic phase of a manganite viamode-selective vibrational excitation, article, May 1, 2007; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc900442/: accessed October 16, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.