Ultrafast Phenomena and Nanophotonics XXIII最新文献

{"title":"Probing spin and valley dynamics in 2D semiconductors (Conference Presentation)","authors":"Luyi Yang, M. Goryca","doi":"10.1117/12.2510805","DOIUrl":"https://doi.org/10.1117/12.2510805","url":null,"abstract":"","PeriodicalId":154511,"journal":{"name":"Ultrafast Phenomena and Nanophotonics XXIII","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130236000","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Fundamentals aspects of ultrafast laser irradiation of colloidal plasmonic nanoparticles (Conference Presentation)","authors":"M. Meunier","doi":"10.1117/12.2509827","DOIUrl":"https://doi.org/10.1117/12.2509827","url":null,"abstract":"","PeriodicalId":154511,"journal":{"name":"Ultrafast Phenomena and Nanophotonics XXIII","volume":"C-24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126479241","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Femtosecond radiative decay of two excitons coupled via radiation-induced interaction in ZnO thin films (Conference Presentation)","authors":"M. Ichimiya, T. Matsuda, T. Kinoshita, M. Nakayama, H. Ishihara, M. Ashida","doi":"10.1117/12.2509409","DOIUrl":"https://doi.org/10.1117/12.2509409","url":null,"abstract":"Micro-resonators with small mode volume and high quality factor are widely used to enhance the interaction between light and matter. On the other hand, simple semiconductor thin films with high crystallinity, which provide long coherent length of the wave functions of center-of-mass motion of excitons, bring about size dependent enhancement of the interaction caused by nonlocal wave-wave coupling between light and exciton beyond long wavelength approximation. Actually, we found peculiar optical responses, e.g. large energy shift and sub-picosecond radiative decay of the weakly confined excitons in CuCl thin films with thickness of hundreds of nm [Phys. Rev. Lett. 103, 257401 (2009)]. Recently, thickness dependence of radiative decay rate was clearly observed in a single crystal Cu2O film with continuously varying thickness (16-1000 nm) [Phys. Rev. B 97, 205305 (2018)]. In the case of ZnO, where A and B excitons closely located, the radiation-induced interaction between the two excitons, which further enhances the energy shift and radiative decay rate, is theoretically predicted [Phys. Rev. B 94, 045441 (2016)]. Therefore, we investigated ZnO thin films by transient grating spectroscopy. The samples were fabricated by pulsed laser deposition on Al2O3 substrates. We confirmed that the measured spectra reflect the shapes of the calculated spectra based on the theory. Moreover, we found the temporal profile of the signal shows ultrafast decay faster than 100 fs at 5 K in the film with a thickness of 289 nm. The results show that strong spatial interaction between light and excitons is realized in multicomponent excitonic systems.","PeriodicalId":154511,"journal":{"name":"Ultrafast Phenomena and Nanophotonics XXIII","volume":"56 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127596804","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Nonreciprocal terahertz optical phenomena with spins and plasma waves (Conference Presentation)","authors":"D. Talbayev","doi":"10.1117/12.2505152","DOIUrl":"https://doi.org/10.1117/12.2505152","url":null,"abstract":"","PeriodicalId":154511,"journal":{"name":"Ultrafast Phenomena and Nanophotonics XXIII","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127675643","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Dephasing dynamics of electron and hole spin qubits in self-assembled quantum dots (Conference Presentation)","authors":"William Rauhaus, T. Simmet, Friedrich Sbresny, Malte Kremser, Fuxiang Li, N. Sinitsyn, K. Müller, J. Finley","doi":"10.1117/12.2510618","DOIUrl":"https://doi.org/10.1117/12.2510618","url":null,"abstract":"","PeriodicalId":154511,"journal":{"name":"Ultrafast Phenomena and Nanophotonics XXIII","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129996850","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Carrier cooling and multiplication in semiconductor nanocrystals and superlattices (Conference Presentation)","authors":"L. Siebbeles","doi":"10.1117/12.2506483","DOIUrl":"https://doi.org/10.1117/12.2506483","url":null,"abstract":"","PeriodicalId":154511,"journal":{"name":"Ultrafast Phenomena and Nanophotonics XXIII","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126108894","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Polaronic effects in excitonic correlations in two-dimensional metal-halide perovskites (Conference Presentation)","authors":"Carlos Silva, A. R. S. Kandada, F. Thouin","doi":"10.1117/12.2511678","DOIUrl":"https://doi.org/10.1117/12.2511678","url":null,"abstract":"With strongly bound and stable excitons at room temperature, single-layer, two-dimensional organic-inorganic\u0000hybrid perovskites are viable semiconductors for light-emitting quantum optoelectronics applications. In such a technological context, it is imperative to comprehensively explore all the factors—chemical, electronic, and structural—that govern strong multiexciton correlations. Here, by means of two-dimensional coherent spectroscopy, we examine excitonic many-body effects in pure, single-layer (PEA)2PbI4 (PEA= phenylethylam- monium). Using coherent two-dimensional excitation spectroscopy, we determine the binding energy of biexcitons—correlated two-electron, two-hole quasiparticles—to be 44 ± 5meV at room temperature. The extraordinarily high values are similar to those reported in other strongly excitonic two-dimensional materials such as transition-metal dichalcogenides. Importantly, we show that this binding energy increases by ∼25% upon cooling to 5 K. Our work highlights the importance of multiexciton correlations in this class of technologically promising, solution-processablematerials, in spite ofthe strong effects of lattice fluctuations and dynamic disorder.\u0000\u0000We demonstrate that there are non-negligible contributions to the excitonic correlations that are specific to the lattice structure and its polar fluctuations, both of which are controlled via the chemical nature of the organic countercation. We present a phenomenological yet quantitative framework to simulate excitonic absorption line shapes in single-layer organic-inorganic hybrid perovskites, based on the two-dimensionalWannier formalism. We include four distinct excitonic states separated by 35 ± 5 meV, and additional vibronic progressions. Intriguingly, the associated Huang-Rhys factors and the relevant phonon energies show substantial variation with temperature and the nature of the organic cation. This points to the hybrid nature of the line shape, with a form well described by a Wannier formalism, but with signatures of strong coupling to localized vibrations, and polaronic effects perceived through excitonic correlations. We demonstrate, using high-resolution impulsive stimulated Raman spectroscopy, that the coupling of distinct excitonic resonanes to the lattice is unique, with some excitonic transition displaying lattice reorganization akin to photocarriers. Our work highlights the complexity of excitonic properties in this class of nanostructured materials.","PeriodicalId":154511,"journal":{"name":"Ultrafast Phenomena and Nanophotonics XXIII","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133960295","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Transient charge separation in centro-symmetric media by magneto-optic nonlinearities (Conference Presentation)","authors":"M. Trinh, K. Makhal, A. Ayesheshim, S. Rand","doi":"10.1117/12.2509026","DOIUrl":"https://doi.org/10.1117/12.2509026","url":null,"abstract":"","PeriodicalId":154511,"journal":{"name":"Ultrafast Phenomena and Nanophotonics XXIII","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127652359","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Observing long-lived nonradiative electronic states in silicon-vacancy centers in diamond using optical multidimensional coherent spectroscopy (Conference Presentation)","authors":"C. Smallwood, R. Ulbricht, Matthew W. Day, T. Schröder, Kelsey M. Bates, T. Autry, G. Diederich, E. Bielejec, M. Siemens, S. Cundiff","doi":"10.1117/12.2510837","DOIUrl":"https://doi.org/10.1117/12.2510837","url":null,"abstract":"","PeriodicalId":154511,"journal":{"name":"Ultrafast Phenomena and Nanophotonics XXIII","volume":"267 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124338283","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Ultrafast nanoscale dynamics probed by time-resolved transmission electron microscopy (Conference Presentation)","authors":"S. Schäfer","doi":"10.1117/12.2509381","DOIUrl":"https://doi.org/10.1117/12.2509381","url":null,"abstract":"Ultrafast transmission electron microscopy (UTEM) is a promising experimental approach for the investigation of ultrafast dynamics on nanometer length scales [1]. In UTEM, optically triggered dynamics are imaged by femtosecond electron pulses, utilizing the versatile imaging and diffraction capabilities of state-of-the-art transmission electron microscopy. \u0000In the Gottingen UTEM project, we developed nanoscale laser-driven photocathodes, delivering ultrashort high-coherence electron pulses. With this approach, we achieve, at the sample position, electron focal spot sizes down to below one nanometer and pulse durations of about 200 fs [2], which now enables the detailed real-space investigation of fast processes in nanostructured systems. \u0000In this contribution, first applications of the Gottingen UTEM instrument are presented, including the coherent phase modulation of electron pulses in optical near-fields [3] and its use for the formation of attosecond electron pulse trains [4], the nanoscale mapping of optically induced ultrafast structural dynamics [5], and our current progress towards ultrafast magnetic imaging using phase sensitive imaging [6]. \u0000[1] A. H. Zewail, Science 328, 187–93 (2010).\u0000[2] A. Feist et al., Ultramicroscopy 176, 63-73 (2017). \u0000[3] A. Feist et al., Nature 521, 200–203 (2015).\u0000[4] K. E. Priebe et al., Nature Photonics 11, 793 (2017).\u0000[5] A. Feist et al., Structural Dynamics 5, 014302 (2018). \u0000[6] N. Rubiano da Silva et al., Phys. Rev X, accepted (2018).","PeriodicalId":154511,"journal":{"name":"Ultrafast Phenomena and Nanophotonics XXIII","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126121579","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}