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  1. Article ; Online: Ultrafast spin dynamics: complementing theoretical analyses by quantum state measures.

    Ziolkowski, Franziska / Busch, Oliver / Mertig, Ingrid / Henk, Jürgen

    Journal of physics. Condensed matter : an Institute of Physics journal

    2023  Volume 35, Issue 12

    Abstract: In theoretical analyses of ultrafast spin dynamics simulated phenomena are commonly discussed in terms of observables. In this paper we report on possible benefits of complementing such studies by quantum state (QS) measures. These measures quantify ... ...

    Abstract In theoretical analyses of ultrafast spin dynamics simulated phenomena are commonly discussed in terms of observables. In this paper we report on possible benefits of complementing such studies by quantum state (QS) measures. These measures quantify specific properties of QSs, e.g. distance in Hilbert space and mixing. For Co/Cu heterostructures illuminated by femtosecond laser pulses, we discuss the general behavior of selected measures, but address in particular the degree of perturbation by a laser pulse. It turns out that the measures are especially sensitive to variations of the polarization of a laser pulse and the sample composition. Moreover, they are closely linked to magnetization and number of photo-excited electrons.
    Language English
    Publishing date 2023-01-31
    Publishing country England
    Document type Journal Article
    ZDB-ID 1472968-4
    ISSN 1361-648X ; 0953-8984
    ISSN (online) 1361-648X
    ISSN 0953-8984
    DOI 10.1088/1361-648X/acb479
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article: Lebendige Naturschutzarbeit von BUND und AHO für Amphibien und Orchideen

    Busch, Olaf

    Landschaftspflege und Naturschutz in Thüringen

    2018  Volume 55, Issue 2, Page(s) 89

    Language German
    Document type Article
    ZDB-ID 129331-x
    ISSN 0323-8253
    Database Current Contents Nutrition, Environment, Agriculture

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    In stock of ZB MED Bonn / Germany

    Z 5229: Show issues

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  3. Article ; Conference proceedings: EUS-guided choledochoduodenostomy for primary drainage of malignant distal biliary obstruction (SCORPION-II-p): a prospective pilot study using FCSEMS through LAMS

    Fritzsche, J. A. / Fockens, P. / Besselink, M. / Busch, O. / Daams, F. / Wilmink, J. / Voermans, R. P. / van Wanrooij, R.L J

    Endoscopy

    2024  Volume 56, Issue S 02

    Event/congress ESGE Days 2024, Berlin, Germany, 2024-04-25
    Language English
    Publishing date 2024-04-01
    Publisher Georg Thieme Verlag KG
    Publishing place Stuttgart ; New York
    Document type Article ; Conference proceedings
    ZDB-ID 80120-3
    ISSN 1438-8812 ; 0013-726X
    ISSN (online) 1438-8812
    ISSN 0013-726X
    DOI 10.1055/s-0044-1782926
    Database Thieme publisher's database

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    In stock of ZB MED Cologne/Königswinter

    Zs.A 669: Show issues Location:
    Je nach Verfügbarkeit (siehe Angabe bei Bestand)
    bis Jg. 1994: Bestellungen von Artikeln über das Online-Bestellformular
    Jg. 1995 - 2021: Lesesall (1.OG)
    ab Jg. 2022: Lesesaal (EG)
    Zs.MO 162: Show issues

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  4. Book ; Online: Ultrafast dynamics of electrons excited by femtosecond laser pulses

    Busch, Oliver / Ziolkowski, Franziska / Mertig, Ingrid / Henk, Jürgen

    spin polarization and spin-polarized currents

    2023  

    Abstract: Laser radiation incident on a ferromagnetic sample produces excited electrons and currents whose spin polarization must not be aligned with the magnetization -- an effect due to spin-orbit coupling that is ubiquitous in spin- and angle-resolved ... ...

    Abstract Laser radiation incident on a ferromagnetic sample produces excited electrons and currents whose spin polarization must not be aligned with the magnetization -- an effect due to spin-orbit coupling that is ubiquitous in spin- and angle-resolved photoemission. In this Paper, we report on a systematic investigation of the dynamics of spin polarization and spin-polarized currents produced by femtosecond laser pulses, modeled within our theoretical framework EVOLVE. The spin polarization depends strongly on the properties of the laser pulse and on the sample composition, as is shown by comparing results for Cu(100), Co(100), and a Co/Cu heterostructure. We find a transition from coherence before the laser pulse's maximum to incoherence thereafter. Moreover, the time dependence of the spin-polarization components induced by spin-orbit coupling differ significantly in Cu and Co: in Cu, we find long-period oscillations with tiny rapid modulations, whereas in Co prominent rapid oscillations with long period ones are superimposed. The pronounced spatial dependencies of the signals underline the importance of inhomogeneities, in particular magnetic/non-magnetic interfaces `act as source' for ultrafast spin-polarization effects. Our investigation provides detailed insight into electron dynamics during and shortly after a femtosecond laser excitation.
    Keywords Condensed Matter - Materials Science
    Subject code 530 ; 535
    Publishing date 2023-03-16
    Publishing country us
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  5. Book ; Online: Orbital Hall effect and orbital edge states caused by s electrons

    Busch, Oliver / Mertig, Ingrid / Göbel, Börge

    2023  

    Abstract: An orbital current can be generated whenever an object has a translational and rotational degree of freedom. In condensed matter physics, intra-atomic contributions to the transverse orbital transport, labeled orbital Hall effect, rely on propagating ... ...

    Abstract An orbital current can be generated whenever an object has a translational and rotational degree of freedom. In condensed matter physics, intra-atomic contributions to the transverse orbital transport, labeled orbital Hall effect, rely on propagating wave packets that must consist of hybridized atomic orbitals. However, inter-atomic contributions have to be considered as well because they give rise to a new mechanism for generating orbital currents. As we show, even wave packets consisting purely of s electrons can transport orbital angular momentum if they move on a cycloid trajectory. We introduce the kagome lattice with a single s orbital per atom as the minimal model for the orbital Hall effect and observe the cycloid motion of the electrons in the surface states.

    Comment: 6 pages, 4 figures
    Keywords Condensed Matter - Mesoscale and Nanoscale Physics ; Condensed Matter - Materials Science ; Condensed Matter - Strongly Correlated Electrons
    Subject code 541
    Publishing date 2023-06-29
    Publishing country us
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  6. Book ; Online: Ultrafast Dynamics of Orbital Angular Momentum of Electrons Induced by Femtosecond Laser Pulses

    Busch, Oliver / Ziolkowski, Franziska / Mertig, Ingrid / Henk, Jürgen

    Generation and Transfer Across Interfaces

    2023  

    Abstract: The orbital angular momenta (OAM) of electrons play an increasingly important role in ultrafast electron and magnetization dynamics. In this theoretical study, we investigate the electron dynamics induced by femtosecond laser pulses in a normal metal, a ... ...

    Abstract The orbital angular momenta (OAM) of electrons play an increasingly important role in ultrafast electron and magnetization dynamics. In this theoretical study, we investigate the electron dynamics induced by femtosecond laser pulses in a normal metal, a ferromagnet, and a ferromagnet/normal metal heterostructure. We analyze the spatio-temporal distributions of the laser-induced OAM and their respective currents. Our findings demonstrate that a circularly polarized laser pulse can induce a sizable and long-lasting OAM component in a normal metal. Furthermore, an interface between a ferromagnet and a normal metal facilitates the demagnetization of the magnet by the OAM contribution to the total magnetization. Finally, to transfer OAM from a ferromagnet into a normal metal, it is advantageous to use a laser setup that induces the desired OAM component in the ferromagnet, but not in the normal metal.
    Keywords Condensed Matter - Materials Science
    Subject code 530
    Publishing date 2023-06-22
    Publishing country us
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  7. Article ; Online: Resonance production at SPS energies

    Busch O.

    EPJ Web of Conferences, Vol 36, p

    CERES and NA49

    2012  Volume 00005

    Abstract: We present results on resonance production by the NA49 and CERES collaborations. The measurement of the differential yields and spectral distributions of the K*(892), Δ(1232), ρ, ϕ and Λ(1520) resonances from their leptonic and hadronic decay channels at ...

    Abstract We present results on resonance production by the NA49 and CERES collaborations. The measurement of the differential yields and spectral distributions of the K*(892), Δ(1232), ρ, ϕ and Λ(1520) resonances from their leptonic and hadronic decay channels at different C.M.S. energies and for various colliding systems allows us to study in-medium modifications of the resonance mass, width and yield and constrains the properties of the hadronic phase. For K*(892)0, a strong system size dependence of the yield relative to kaon production is found. The production of the Δ(1232) resonance is consistent with thermal model expectations. ϕ meson spectra and yields reconstructed in the leptonic and hadronic decay channels are in agreement. Low-mass dilepton spectra indicate significant regeneration of the ρ meson and a strong modification of the ρ spectral function.
    Keywords Physics ; QC1-999 ; Science ; Q ; DOAJ:Physics (General) ; DOAJ:Physics and Astronomy
    Language English
    Publishing date 2012-11-01T00:00:00Z
    Publisher EDP Sciences
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  8. Article: Der Entwurf der Verwaltungsgrundsätze Betriebsstättengewinnaufteilung

    Busch, Oliver

    Der Betrieb : mit Recht Innovation sichern Vol. 69, No. 16 , p. 910-915

    2016  Volume 69, Issue 16, Page(s) 910–915

    Author's details StB Dr. Oliver Busch
    Language German
    Publisher Handelsblatt Fachmedien
    Publishing place Düsseldorf
    Document type Article
    ZDB-ID 879-5
    ISSN 0005-9935
    Database ECONomics Information System

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  9. Article ; Conference proceedings: EUS-guided choledochoduodenostomy using single step lumen-apposing metal stents for primary drainage of malignant distal biliary obstruction (SCORPION-p): a prospective pilot study

    Fritzsche, J. A. / Fockens, P. / Besselink, M. / Busch, O. / Daams, F. / Wilmink, J. / Voermans, R. P. / van Wanrooij, L J

    Endoscopy

    2023  Volume 55, Issue S 02

    Event/congress ESGE Days 2023, Dublin, Ireland, 2023-04-20
    Language English
    Publishing date 2023-04-01
    Publisher Georg Thieme Verlag KG
    Publishing place Stuttgart ; New York
    Document type Article ; Conference proceedings
    ZDB-ID 80120-3
    ISSN 1438-8812 ; 0013-726X
    ISSN (online) 1438-8812
    ISSN 0013-726X
    DOI 10.1055/s-0043-1765098
    Database Thieme publisher's database

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    In stock of ZB MED Cologne/Königswinter

    Zs.A 669: Show issues Location:
    Je nach Verfügbarkeit (siehe Angabe bei Bestand)
    bis Jg. 1994: Bestellungen von Artikeln über das Online-Bestellformular
    Jg. 1995 - 2021: Lesesall (1.OG)
    ab Jg. 2022: Lesesaal (EG)
    Zs.MO 162: Show issues

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  10. Book ; Online: Ultrafast Orbital Hall Effect in Metallic Nanoribbons

    Busch, Oliver / Ziolkowski, Franziska / Göbel, Börge / Mertig, Ingrid / Henk, Jürgen

    2023  

    Abstract: The orbital Hall effect can generate currents of angular momentum more efficiently than the spin Hall effect in most metals. However, so far, it has only been understood as a steady state phenomenon. In this theoretical study, the orbital Hall effect is ... ...

    Abstract The orbital Hall effect can generate currents of angular momentum more efficiently than the spin Hall effect in most metals. However, so far, it has only been understood as a steady state phenomenon. In this theoretical study, the orbital Hall effect is extended into the time domain. We investigate the orbital angular momenta and their currents induced by a femtosecond laser pulse in a Cu nanoribbon. Our numerical simulations provide detailed insights into the laser-driven electron dynamics on ultrashort timescales with atomic resolution. The ultrafast orbital Hall effect described in this work is consistent with the familiar pictorial representation of the static orbital Hall effect, but we also find pronounced differences between physical quantities that carry orbital angular momentum and those that carry charge. For example, there are deviations in the time series of the respective currents. This study lays the foundations for investigating ultrafast Hall effects in confined metallic systems.
    Keywords Condensed Matter - Materials Science
    Publishing date 2023-07-17
    Publishing country us
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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