Yalunin, Sergey Valerevich

[["dc.bibliographiccitation.firstpage","200"],["dc.bibliographiccitation.issue","7551"],["dc.bibliographiccitation.journal","Nature"],["dc.bibliographiccitation.lastpage","+"],["dc.bibliographiccitation.volume","521"],["dc.contributor.author","Feist, Armin"],["dc.contributor.author","Echternkamp, Katharina E."],["dc.contributor.author","Schauss, Jakob"],["dc.contributor.author","Yalunin, Sergey V."],["dc.contributor.author","Schäfer, Sascha"],["dc.contributor.author","Ropers, Claus"],["dc.date.accessioned","2018-11-07T09:57:15Z"],["dc.date.available","2018-11-07T09:57:15Z"],["dc.date.issued","2015"],["dc.description.abstract","Coherent manipulation of quantum systems with light is expected to be a cornerstone of future information and communication technology, including quantum computation and cryptography(1). The transfer of an optical phase onto a quantum wavefunction is a defining aspect of coherent interactions and forms the basis of quantum state preparation, synchronization and metrology. Light-phase-modulated electron states near atoms and molecules are essential for the techniques of attosecond science, including the generation of extreme-ultraviolet pulses and orbital tomography(2,3). In contrast, the quantum-coherent phase-modulation of energetic free-electron beams has not been demonstrated, although it promises direct access to ultrafast imaging and spectroscopy with tailored electron pulses on the attosecond scale. Here we demonstrate the coherent quantum state manipulation of free-electron populations in an electron microscope beam. We employ the interaction of ultrashort electron pulses with optical nearfields(4-9) to induce Rabi oscillations in the populations of electron momentum states, observed as a function of the optical driving field. Excellent agreement with the scaling of an equal-Rabi multi-level quantum ladder is obtained(10), representing the observation of a light-driven 'quantum walk'(5) coherently reshaping electron density in momentum space(11). We note that, after the interaction, the optically generated superposition of momentum states evolves into a train of attosecond electron pulses. Our results reveal the potential of quantum control for the precision structuring of electron densities, with possible applications ranging from ultrafast electron spectroscopy and microscopy to accelerator science and free-electron lasers."],["dc.identifier.doi","10.1038/nature14463"],["dc.identifier.isi","000354377800054"],["dc.identifier.pmid","25971512"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/37119"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["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","1476-4687"],["dc.relation.issn","0028-0836"],["dc.title","Quantum coherent optical phase modulation in an ultrafast transmission electron microscope"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.subtype","original_ja"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.artnumber","UNSP 80"],["dc.bibliographiccitation.issue","4"],["dc.bibliographiccitation.journal","Applied Physics B"],["dc.bibliographiccitation.volume","122"],["dc.contributor.author","Echternkamp, Katharina E."],["dc.contributor.author","Herink, Georg"],["dc.contributor.author","Yalunin, Sergey V."],["dc.contributor.author","Rademann, K."],["dc.contributor.author","Schaefer, S."],["dc.contributor.author","Ropers, Claus"],["dc.date.accessioned","2018-11-07T10:16:24Z"],["dc.date.available","2018-11-07T10:16:24Z"],["dc.date.issued","2016"],["dc.description.abstract","Metallic nanotips exhibit large electric field enhancements over an extremely broad bandwidth spanning from the optical domain down to static fields. They therefore constitute ideal model systems for the investigation of the inherent frequency scalings of highly nonlinear and strong-field phenomena. Here, we present a comprehensive study of strong-field photoemission from individual metallic nanotips. Combining high local fields and variable-wavelength mid-infrared pulses, we investigate electron dynamics governed by the nanoscale confinement of the optical near-field. In particular, we characterize a transition to sub-cycle, field-driven electron acceleration. The experimental findings are corroborated by semiclassical calculations within a two-step model."],["dc.description.sponsorship","Deutsche Forschungsgemeinschaft [SPP 1391, SFB 1073]"],["dc.identifier.doi","10.1007/s00340-016-6351-x"],["dc.identifier.isi","000372894600013"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/41031"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["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","1432-0649"],["dc.relation.issn","0946-2171"],["dc.title","Strong-field photoemission in nanotip near-fields: from quiver to sub-cycle electron dynamics"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.subtype","original_ja"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","1203"],["dc.bibliographiccitation.issue","S3"],["dc.bibliographiccitation.journal","Microscopy and Microanalysis"],["dc.bibliographiccitation.lastpage","1204"],["dc.bibliographiccitation.volume","21"],["dc.contributor.author","Feist, Armin"],["dc.contributor.author","Echternkamp, Katharina E."],["dc.contributor.author","Schauss, Jakob"],["dc.contributor.author","Yalunin, Sergey Valerevich"],["dc.contributor.author","Schäfer, Sascha"],["dc.contributor.author","Ropers, Claus"],["dc.date.accessioned","2020-02-03T09:01:44Z"],["dc.date.available","2020-02-03T09:01:44Z"],["dc.date.issued","2015"],["dc.identifier.doi","10.1017/S1431927615006807"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/62929"],["dc.language.iso","en"],["dc.relation.issn","1431-9276"],["dc.relation.issn","1435-8115"],["dc.title","Ultrafast Transmission Electron Microscopy with nanoscale Photoemitters"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","432"],["dc.bibliographiccitation.issue","6"],["dc.bibliographiccitation.journal","Nature Physics"],["dc.bibliographiccitation.lastpage","436"],["dc.bibliographiccitation.volume","10"],["dc.contributor.author","Wimmer, Lara"],["dc.contributor.author","Herink, Georg"],["dc.contributor.author","Solli, Daniel R."],["dc.contributor.author","Yalunin, Sergey V."],["dc.contributor.author","Echternkamp, Katharina E."],["dc.contributor.author","Ropers, Claus"],["dc.date.accessioned","2018-11-07T09:39:35Z"],["dc.date.available","2018-11-07T09:39:35Z"],["dc.date.issued","2014"],["dc.description.abstract","The active control of matter by strong electromagnetic fields is of growing importance, with applications all across the optical spectrum from the extreme-ultraviolet to the far-infrared. In recent years, phase-stable terahertz fields have shown tremendous potential for observing and manipulating elementary excitations in solids(1-3). In the gas phase, on the other hand, driving free charges with terahertz transients provides insight into ultrafast ionization dynamics(4,5). Developing such approaches for locally enhanced terahertz fields in nanostructures will create new means to govern electron currents on the nanoscale. Here, we use single-cycle terahertz transients to demonstrate extensive control over nanotip photoelectron emission. The terahertz near-field is shown to either enhance or suppress photocurrents, with the tip acting as an ultrafast rectifying diode(6). We record phase-resolved sub-cycle dynamics and find spectral compression and expansion arising from electron propagation within the terahertz near-field. These interactions produce rich spectro-temporal features and offer unprecedented control over ultrashort free electron pulses for imaging and diffraction."],["dc.description.sponsorship","Deutsche Forschungsgemeinschaft [DFG-SPP 1391, ZuK 45/1]"],["dc.identifier.doi","10.1038/NPHYS2974"],["dc.identifier.isi","000336969500019"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/33316"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Nature Publishing Group"],["dc.relation.issn","1745-2481"],["dc.relation.issn","1745-2473"],["dc.title","Terahertz control of nanotip photoemission"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.artnumber","FTh1E.3"],["dc.contributor.author","Feist, Armin"],["dc.contributor.author","Echternkamp, Katharina E."],["dc.contributor.author","Schauss, Jakob"],["dc.contributor.author","Yalunin, Sergey Valerevich"],["dc.contributor.author","Schäfer, Sascha"],["dc.contributor.author","Ropers, Claus"],["dc.date.accessioned","2020-02-03T08:41:35Z"],["dc.date.available","2020-02-03T08:41:35Z"],["dc.date.issued","2015"],["dc.description.abstract","Photon-induced scattering of swift electrons with confined light is studied by ultrafast transmission electron microscopy (UTEM) and employed to locally map optical near-fields. Fluence-dependent kinetic energy spectra reveal quantum coherent scattering features."],["dc.identifier.doi","10.1364/CLEO_QELS.2015.FTh1E.3"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/62923"],["dc.language.iso","en"],["dc.publisher","IEEE"],["dc.relation.conference","2015 Conference on Lasers and Electro-Optics (CLEO)"],["dc.relation.eisbn","978-1-55752-968-8"],["dc.relation.eventend","2015-05-15"],["dc.relation.eventlocation","San Jose, CA, USA"],["dc.relation.eventstart","2015-05-10"],["dc.relation.ispartof","2015 Conference on Lasers and Electro-Optics (CLEO)"],["dc.relation.issn","2160-8989"],["dc.title","Electron-Light Interaction in Optical Near-Fields studied by Ultrafast Transmission Electron Microscopy"],["dc.type","conference_paper"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]