Selected recent publications



  • F. Langer, M. Hohenleutner, C. Schmid, C. Poellmann, P. Nagler, T. Korn, C. Schüller, M. S. Sherwin, U. Huttner, J. T. Steiner, S. W. Koch, M. Kira, and R. Huber, Lightwave-driven quasiparticle collisions on a sub-cycle timescale, Nature 533, 225 (2016). [link]
    Concept of a quasiparticle collider is demonstrated.
  • T. Maag, A. Bayer, S. Baierl, M. Hohenleutner, T. Korn, C. Schüller, D. Schuh, D. Bougeard, C. Lange, R. Huber, M. Mootz, J. E. Sipe, S. W. Koch, and M. Kira, Coherent cyclotron motion beyond Kohn’s theorem, Nat. Phys. 12, 119 (2016). [link]
    Coulomb interaction induced nonlinearity among Landau electrons is identified.


  • M. Hohenleutner, F. Langer, O. Schubert, M. Knorr, U. Huttner, S.W. Koch, M. Kira, and R. Huber, Real-time observation of interfering crystal electrons in high-harmonic generation, Nature 523, 572 (2015). [link]
    Optically induced quantum interference is detected among terahertz-field accelerated electrons.
  • M. Kira, Coherent quantum depletion of an interacting atom condensate, Nat. Comm. 6, 6624 (2015).[link]
    Semiconductors aspects are shown to quantitatively explain strong many-body interactions in atomic Bose-Einstein condensates.
  • M. Kira, Hyperbolic Bloch equations: atom-cluster kinetics of an interacting Bose gas, Ann. Phys. 356, 185 (2015). [link]
    Connection between semiconductors and strongly interacting atomic BECs is established.
  • O. Vänskä, I. Tittonen, S.W. Koch, and M. Kira, Coherent terahertz control of vertical transport in semiconductor heterostructures, Phys. Rev. Lett. 114, 116802 (2015). [link]
    A scheme to transport particle correlations, instead of particles, is proposed.


  • A.E.Almand-Hunter, H. Li, S.T. Cundiff, M. Mootz, M. Kira, and S.W. Koch, Quantum droplets of electrons and holes, Nature 506, 471 (2014). [link]
    Cover story, a new quasiparticle – the dropleton – is reported by applying quantum spectroscopy.
  • C. Berger, U. Huttner, M. Mootz, M. Kira, S.W. Koch, J.-S. Tempel, M. Aßmann, M. Bayer, A.M. Mintairov, and J.L. Merz, Quantum-memory effects in the emission of quantum-dot microcavities, Phys. Rev. Lett. 113, 093902 (2014). [link]
    Quantum spectroscopy detects a quantum-memory effect in microdisk lasers.
  • O. Schubert, M. Hohenleutner, F. Langer, B. Urbanek, C. Lange, U. Huttner, D. Golde, T. Meier, M. Kira, S.W. Koch, and R. Huber, Sub-cycle control of terahertz high-harmonic generation by dynamical Bloch oscillations, Nat. Phot. 8, 119 (2014). [link]
    The role of optical Bloch equations on high-harmonic generation is identified.
  • D. Jameson, J. L. Tomaino, Y.-S. Lee, G. Khitrova, H. M. Gibbs, C. N. Böttge, A. C. Klettke, M. Kira, and S. W. Koch, Direct measurement of light–matter energy exchange inside a microcavity, Optica 1, 276 (2014).[link]
    Direct measurement of light-matter interaction is established.

Before 2013

  • W.D. Rice, J. Kono, S. Zybell, S. Winnerl, J. Bhattacharyya, H. Schneider, M. Helm, B. Ewers, A. Chernikov, M. Koch, S. Chatterjee, G. Khitrova, H.M. Gibbs, L. Schneebeli, B. Breddermann, M. Kira, and S.W. Koch, Observation of Forbidden Exciton Transitions Mediated by Coulomb Interactions in Photoexcited Semiconductor Quantum Wells, Phys. Rev. Lett. 110, 137404 (2013). [link]
    Coulomb-mediated symmetry breaking is demonstrated to introduce 1s-to-2s transitions.
  • J.L. Tomaino, A.D. Jameson, Y.-S. Lee, G. Khitrova, H.M. Gibbs, A.C. Klettke, M. Kira, and S.W. Koch, Terahertz Excitation of a Coherent Lambda-Type Three-Level System of Exciton-Polariton Modes in a Quantum-Well Microcavity, Phys. Rev. Lett. 108, 267402 (2012). [link]
    A Lambda system is identified in excitonic microcavity.
  • M. Kira, S.W. Koch, R.P. Smith, A.E. Hunter, and S.T. Cundiff, Quantum spectroscopy with Schrödinger-cat states, Nat. Phys. 7, 799 (2011). [link]
    Experimentally feasible framework for quantum spectroscopy is introduced.
  • F. Blanchard, D. Golde, F.H. Su, L. Razzari, G. Sharma, R. Morandotti, T. Ozaki, M. Reid, M. Kira, S.W. Koch, and F. A. Hegmann, Effective Mass Anisotropy of Hot Electrons in Nonparabolic Conduction Bands of n-Doped InGaAs Films Using Ultrafast Terahertz Pump-Probe Techniques, Phys. Rev. Lett. 107, 107401 (2011). [link]
    Direct measurement of effective mass anisotropy is demonstrated.