Storeck, Gero

[["dc.bibliographiccitation.firstpage","184"],["dc.bibliographiccitation.issue","2"],["dc.bibliographiccitation.journal","Nature Physics"],["dc.bibliographiccitation.lastpage","190"],["dc.bibliographiccitation.volume","14"],["dc.contributor.author","Vogelgesang, S."],["dc.contributor.author","Storeck, Gero"],["dc.contributor.author","Horstmann, J. G."],["dc.contributor.author","Diekmann, T."],["dc.contributor.author","Sivis, Murat"],["dc.contributor.author","Schramm, S."],["dc.contributor.author","Rossnagel, K."],["dc.contributor.author","Schäfer, S."],["dc.contributor.author","Ropers, Claus"],["dc.date.accessioned","2019-11-28T10:30:29Z"],["dc.date.available","2019-11-28T10:30:29Z"],["dc.date.issued","2017"],["dc.description.abstract","We introduce ultrafast low-energy electron diffraction (ULEED) in backscattering for the study of structural dynamics at surfaces. Using a tip-based source of ultrashort electron pulses, we investigate the optically driven transition between charge density wave phases at the surface of 1T-TaS2. The large transfer width of the instrument allows us to employ spot-profile analysis, resolving the phase-ordering kinetics in the nascent incommensurate charge density wave phase. We observe a coarsening that follows a power-law scaling of the correlation length, driven by the annihilation of dislocation-type topological defects of the charge-ordered lattice. Our work opens up the study of a wide class of structural transitions and ordering phenomena at surfaces and in low-dimensional systems."],["dc.identifier.doi","10.1038/nphys4309"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/62698"],["dc.language.iso","en"],["dc.relation","SFB 1073: Kontrolle von Energiewandlung auf atomaren Skalen"],["dc.relation","SFB 1073 | Topical Area A | A05 Nanoskalige Untersuchung raumzeitlicher Relaxation in heterogenen Systemen mit ultraschneller Transmissionselektronenmikroskopie"],["dc.relation.issn","1745-2473"],["dc.relation.issn","1745-2481"],["dc.title","Phase ordering of charge density waves traced by ultrafast low-energy electron diffraction"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.subtype","original_ja"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","46"],["dc.bibliographiccitation.issue","7810"],["dc.bibliographiccitation.journal","Nature"],["dc.bibliographiccitation.lastpage","49"],["dc.bibliographiccitation.volume","582"],["dc.contributor.author","Kfir, Ofer"],["dc.contributor.author","Lourenço-Martins, Hugo"],["dc.contributor.author","Storeck, Gero"],["dc.contributor.author","Sivis, Murat"],["dc.contributor.author","Harvey, Tyler R."],["dc.contributor.author","Kippenberg, Tobias J."],["dc.contributor.author","Feist, Armin"],["dc.contributor.author","Ropers, Claus"],["dc.date.accessioned","2021-04-14T08:25:47Z"],["dc.date.available","2021-04-14T08:25:47Z"],["dc.date.issued","2020"],["dc.description.abstract","Free-electron beams serve as uniquely versatile probes of microscopic structure and composition, and have repeatedly revolutionized atomic-scale imaging, from solid-state physics to structural biology. Over the past decade, the manipulation and interaction of electrons with optical fields has seen significant progress, enabling novel imaging methods, schemes of near-field electron acceleration, and culminating in 4D microscopy techniques with both high temporal and spatial resolution. However, weak coupling strengths of electron beams to optical excitations are a standing issue for existing and emerging applications of optical free-electron control. Here, we demonstrate phase matched near-field coupling of a free-electron beam to optical whispering gallery modes of dielectric microresonators. The cavity-enhanced interaction with these optically excited modes imprints a strong phase modulation on co-propagating electrons, which leads to electron-energy sidebands up to hundreds of photon orders and a spectral broadening of 700 eV. Mapping the near-field interaction with ultrashort electron pulses in space and time, we trace the temporal ring-down of the microresonator following a femtosecond excitation and observe the cavity's resonant spectral response. Resonantly enhancing the coupling of electrons and light via optical cavities, with efficient injection and extraction, can open up novel applications such as continuous-wave acceleration, attosecond structuring, and real-time all-optical electron detection."],["dc.identifier.arxiv","1910.09540v1"],["dc.identifier.doi","10.1038/s41586-020-2320-y"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/81731"],["dc.language.iso","en"],["dc.notes.intern","DOI Import GROB-399"],["dc.relation.eissn","1476-4687"],["dc.relation.issn","0028-0836"],["dc.title","Controlling free electrons with optical whispering-gallery modes"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.artnumber","044024"],["dc.bibliographiccitation.issue","4"],["dc.bibliographiccitation.journal","Structural Dynamics"],["dc.bibliographiccitation.volume","4"],["dc.contributor.author","Storeck, Gero"],["dc.contributor.author","Vogelgesang, Simon"],["dc.contributor.author","Sivis, Murat"],["dc.contributor.author","Schäfer, Sascha"],["dc.contributor.author","Ropers, Claus"],["dc.date.accessioned","2018-11-07T10:22:24Z"],["dc.date.available","2018-11-07T10:22:24Z"],["dc.date.issued","2017"],["dc.description.abstract","We present the design and fabrication of a micrometer-scale electron gun for the implementation of ultrafast low-energy electron diffraction from surfaces. A multi-step process involving photolithography and focused-ion-beam nanostructuring is used to assemble and electrically contact the photoelectron gun, which consists of a nanotip photocathode in a Schottky geometry and an einzel lens for beam collimation. We characterize the low-energy electron pulses by a transient electric field effect and achieve pulse durations of 1.3 ps at an electron energy of 80 eV. First diffraction images in a backscattering geometry (at 50 eV electron energy) are shown. (C) 2017 Author(s)."],["dc.description.sponsorship","European Research Council (ERC-StG \"ULEED\")"],["dc.identifier.doi","10.1063/1.4982947"],["dc.identifier.isi","000402004800021"],["dc.identifier.pmid","28580366"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/14779"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/42266"],["dc.notes.intern","Merged from goescholar"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","PUB_WoS_Import"],["dc.relation","info:eu-repo/grantAgreement/EC/H2020/639119/EU/Observing structural dynamics at surfaces with Ultrafast Low-Energy Electron Diffraction/ULEED"],["dc.relation.issn","2329-7778"],["dc.relation.orgunit","Fakultät für Physik"],["dc.rights","CC BY 4.0"],["dc.title","Nanotip-based photoelectron microgun for ultrafast LEED"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dspace.entity.type","Publication"]]