• nature data cover

    In this study, we've applied coherent diffractive imaging to study the structure of a single Rice dwarf virus. The CXI instrument at the Linac coherent light source focuses 1012 photons into a nanometer-sized area. Here the X-rays scatter of a single virus particle and create a snapshot of the virus. The acquired dataset of this study has been published in Nature scientific data, that allows access to the actual dataset. The publication yields information on how to access the data and background information as well. This result comes out of a large collaboration, the Single particle initiative, where scientists from around the world have united to pull on one string and push the method of Single particle imaging to the next level.

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  • nature data coverNature Scientific Data 3, Article number: 160064
    Anna Munke, Jakob Andreasson, Andrew Aquila, Salah Awel, Kartik Ayyer, Anton Barty, Richard Bean, Peter Berntsen, Johan Bielecki, Sébastien Boutet, Maximilian Bucher, Henry Chapman, Benedikt Daurer, Hasan DeMirci, Veit Elser, Petra Fromme, Janos Hajdu, Max Hantke, Akifumi Higashiura, Brenda Hogue, Ahmad Hosseinizadeh, Yoonhee Kim, Richard Kirian, Hemanth Kumar, Ti-Yen Lan, Daniel Larsson, Haiguang Liu, Duane Loh, Filipe Maia, Adrian Mancuso, Kerstin Mühlig, Atsushi Nakagawa, Daewoong Nam, Garrett Nelson, Carl Nettelblad, Kenta Okamoto, Abbas Ourmazd, Max Rose, Gijs van der Schot, Peter Schwander, Marvin Seibert, Jonas Sellberg, Raymond Sierra, Changyong Song, Martin Svenda, Nicusor Timneanu, Ivan Vartanyants, Daniel Westphal, Max Wiedorn, Garth Williams, Paulraj Xavier, Chun Hong Yoon, and James Zook
    Published 1 August 2016

  • dual crystal spectrometer Journal of Instrumentation, Volume 11
    E.J. Gamboa, B. Bachmann, D. Kraus, M.J. MacDonald, M. Bucher, S. Carron, R.N. Coffee, R.P. Drake, J. Emig, K.R. Ferguson, L.B. Fletcher, S.H. Glenzer, T. Gorkhover, S.P. Hau-Riege, J. Krzywinski, A.L. Levitan, K.-H. Meiwes-Broer, T. Osipov, T. Pardini, C. Peltz, S. Skruszewicz, C. Bostedt, T. Fennel and T. Döppner
    Published 22 August 2016

  • ncomms11652 f1Nature Communications 7, Article number: 11652
    A. Picón, C. S. Lehmann, C. Bostedt, A. Rudenko, A. Marinelli, T. Osipov, D. Rolles, N. Berrah, C. Bomme, M. Bucher, G. Doumy, B. Erk, K. R. Ferguson, T. Gorkhover, P. J. Ho, E. P. Kanter, B. Krässig, J. Krzywinski, A. A. Lutman, A. M. March, D. Moonshiram, D. Ray, L. Young, S. T. Pratt & S. H. Southworth
    Published 23 May 2016

  • Thomson Scattering MacDonaldRev. Sci. Instrum. 87, 11E709
    M. J. MacDonald, T. Gorkhover, B. Bachmann, M. Bucher, S. Carron, R. N. Coffee, R. P. Drake, K. R. Ferguson, L. B. Fletcher, E. J. Gamboa, S. H. Glenzer, S. Göde, S. P. Hau-Riege, D. Kraus, J. Krzywinski, A. L. Levitan, K.-H. Meiwes-Broer, C. P. O’Grady, T. Osipov, T. Pardini, C. Peltz, S. Skruszewicz, M. Swiggers, C. Bostedt, T. Fennel, and T. Döppner
    Published 8 August 2016
  • Thomson Scattering MacDonald

    Measuring transient states of matter on the femto- to attosecond timescale is a current scientific challenge. Particularly for nanometer sized objects, the size of biomolecules for example proteins, it is a challenge to measure signal above the noise level due to low cross-sections. The amount of photons LCLS produces can overcome signal-to-noise issues and opens the door to perform measurements in entirely new regimes. In the featured and recently published study, we make use of LCLS in such a new way and measure an incoherent signal much above the noise level. The basis of this experiments is to spectrally resolve the scattering from free electrons or Thomson scattering. The developed method allows another way to gain insight into transient states, for example, the nanoplasma transformation or chemical reactions that last on the atto- to picosecond timescale. Particularly, parameters such as (electron) temperature, density and ionization levels can be measured using the LAMP endstation at LCLS. To make the proof-of-principle study, a pump-probe scheme was employed that first used an IR laser to induce a transient state (nanoplasma) in a nano-sample (argon clusters) and then secondly, after a time-delay, measures this state using the X-rays LCLS.

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  • ncomms11652 f1I'm pleased to announce that my collaborator Antonio Picon has published his most recent results in Nature Communications. He uses an X-ray pump – X-ray probe concept to induce X-ray dynamics and subsequently probe them. It is one of the first experiments of its kind and uses the free electron laser at Stanford University to investigate ultrafast dynamics in molecules that happen on a femtosecond timescale. Experiments of this kind could be used in the future to better understand chemical reactions and to better understand how light interacts with matter. Particularly on ultrafast time scales.

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  • Please, have a look at a selected list of publications I have worked on. A full list of publications can be found on my Google Scholar profile.

  • Classical stability versus quantum vorticiesPhys. Rev. B 95, 064510
    Charles Bernando, Rico Mayro P. Tanyag, Curtis Jones, Camila Bacellar, Maximilian Bucher, Ken R. Ferguson, Daniela Rupp, Michael Ziemkiewicz, Luis F. Gomez, Adam S. Chatterley, Tais Gorkhover, Maria Mueller, John Bozek, Sebastian Carron, Justin Kwok, Samuel L. Butler, Thomas Moeller, Christoph Bostedt, Oliver Gessner, and Andrey F. Vilesov
    Published 16 February 2017

  • Faraday discussion stimulated emissionOur critical assessment with stimulated Raman scattering using X-Ray free electron lasers (FEL) was recently published in the journal Faraday Discussions. Stimulated Raman scattering or inelastic scattering promises new opportunities to follow electron transfers in chemical reactions. Ultrafast, time-resolved measurements are a cornerstone of FEL science and this method would enable us to broaden the accessible wavelength regime. Our assessment shows current opportunities and limitations of this technique that will become particularly interesting with new superconducting linac light sources, for example, XFEL and Hamburg and LCLS-II. It is foreseen that these new light sources will have much-improved beam characteristics that are particularly interesting for stimulated Raman scattering.

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  • Faraday discussion stimulated emissionFaraday Discussions, accepted manuscript
    Victor Kimberg, Alvaro Sanchez-Gonzalez, Laurent Mercadier, Clemens Weninger, Alberto Lutman, Daniel Ratner, Ryan N Coffee, Maximilian Bucher, Melanie Mucke, Marcus Agåker, Conny Såthe, Christoph Bostedt, Joseph Nordgren, Jan-Erik Rubensson and Nina Rohringer.
    Published 14 June 2016

  • amo figJ. Synchrotron Rad. (2015). 22, 492-497
    K. R. Ferguson, M. Bucher, J. D. Bozek, S. Carron, J.-C. Castagna, R. Coffee, G. I. Curiel, M. Holmes, J. Krzywinski, M. Messerschmidt, M. Minitti, A. Mitra, S. Moeller, P. Noonan, T. Osipov, S. Schorb, M. Swiggers, A. Wallace, J. Yin and C. Bostedt
    Published 17 April 2015

  • dicke paper Phys. Rev. E 86, 012101
    M. Aparicio Alcalde, M. Bucher, C. Emary, and T. Brandes
    Published 18 July 2012

  • Master's thesis of Maximilian BucherIn my Master's thesis, I study a certain class of superradiant states theoretical. Matter that is in a superradiant state uses photons to be in a highly coherent and ordered state. It is suspected that a quantum state like this can be used for supercomputing or really any application that requires coherent photons, such as a very, very precise clock. I designed my calculations to be close to an experimental setup. In this schematic setup, a Bose-Einstein condensate is placed in a single mode cavity and driven with a light field. At a critical light-matter coupling strength, the system will undergo a Dicke-type superradiant phase transition and emit coherent photons.

    In my study, the atomic branch of the Dicke model is expanded into arbitrary (but finite) modes, i.e. multiple excited states are possible. To perform this extension using a full set of Bloch functions. This allows distinguishing between multiple electronic levels but also a quasi-momentum space, i.e. quantized states in the Brillouin-zone. The main tools in this expansion are a generalized Holstein-Primakoff transformation that simplifies the interaction terms and displacement operators, which are of a mean-field type. With these simplified terms, I am able to diagonalize the Hamiltonian in the particle number N --> infinity limit. The model exhibits a superradiant second-order quantum phase transition and we find that the presence of p quasi-momentum modes lowers the critical point yc around yc / p1/2.We also derive excitation energies for a 'two-band' Dicke model above zero temperature. This investigation shows that the system undergoes also a thermal superradiant phase transition for finite numbers of particles N in the ultrastrong-coupling regime y --> infinity. A discussion of the particle statistics leads to a generalized description of atoms in this environment and it describes a crossover between bosonic and fermionic configurations.

    We also derive excitation energies for a 'two-band' Dicke model above zero temperature. This investigation shows that the system undergoes also a thermal superradiant phase transition for finite numbers of particles N in the ultrastrong-coupling regime y --> infinity. A discussion of the particle statistics leads to a generalized description of atoms in this environment and it describes a crossover between bosonic and fermionic configurations.

    Thesis download

    Bachelor's thesis Maximilian BucherIn my Bachelor's thesis, I started to develop the above described multi-mode expansion of the Dicke model by focusing on multiple electronic levels. The mode expansion is, again, performed by Bloch functions. A generalized Holstein-Primakoff transformation and displacement operators allow studying the model in the thermodynamic limit. We then have an effective multi-mode model that exhibits a Dicke-type superradiant phase transition. The more complex super-radiant phase is treated numerically while we were able to receive analytical expressions in the normal phase. The behavior of the Bose-Einstein condensate electronic level population, as well as the behavior of the photon mode, is calculated.

    Thesis download

    My Bachelor's and Master's thesis research has been performed at Technische Universität Berlin (TU Berlin) in the group of Prof. Dr. Tobias Brandes and under the supervision of Prof. Dr. Clive Emary.

  • ken science 2016Sci. Adv. 2016; 2 : e1500837
    Ken R. Ferguson, Maximilian Bucher, Tais Gorkhover, Sébastien Boutet, Hironobu Fukuzawa, Jason E. Koglin, Yoshiaki Kumagai, Alberto Lutman, Agostino Marinelli, Marc Messerschmidt, Kiyonobu Nagaya, Jim Turner, Kiyoshi Ueda, Garth J. Williams, Philip H. Bucksbaum and Christoph Bostedt
    Published 29 January 2016

  • PRA Picon 2016 07This is a similar study to our work published in Nature Communications earlier this year. Here, we investigate diatomic molecules and use a two-color X-ray pump–X-ray probe approach. The pump pulse arrives first and induces dynamics, whereas the probe pulse arrives at a certain time delay and allows us to look at the induced dynamics. Theoretic predictions align well with the observed dynamics, such that we establish a microscopic understanding of the processes. The work has been mainly driven by A. Picon and C.S. Lehmann, whom I particularly congratulate to this paper. Please find more at.

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