Professional Education


  • Diplom, Technische Universitat Munchen (2009)
  • Doctor, Technische Universitat Munchen (2013)

Stanford Advisors


Journal Articles


  • Highly directed emission from self-assembled quantum dots into guided modes in disordered photonic-crystal waveguides PHYSICAL REVIEW B Reichert, T., Lichtmannecker, S., Zeitlmair, M., WEMBACHER, J., Rauscher, A., Bichler, M., Mueller, K., Kaniber, M., Finley, J. J. 2014; 90 (11)
  • Hole-spin pumping and repumping in a p-type delta-doped InAs quantum dot PHYSICAL REVIEW B Lagoudakis, K. G., Fischer, K. A., Sarmiento, T., Mueller, K., Vuckovic, J. 2014; 90 (12)
  • A carrier relaxation bottleneck probed in single InGaAs quantum dots using integrated superconducting single photon detectors APPLIED PHYSICS LETTERS Reithmaier, G., Flassig, F., HASCH, P., Lichtmannecker, S., Mueller, K., Vuckovic, J., Gross, R., Kaniber, M., Finley, J. J. 2014; 105 (8)

    View details for DOI 10.1063/1.4894239

    View details for Web of Science ID 000342753500008

  • Imaging surface plasmon polaritons using proximal self-assembled InGaAs quantum dots JOURNAL OF APPLIED PHYSICS Bracher, G., Schraml, K., Blauth, M., Wierzbowski, J., Lopez, N. C., Bichler, M., Mueller, K., Finley, J. J., Kaniber, M. 2014; 116 (3)

    View details for DOI 10.1063/1.4889859

    View details for Web of Science ID 000340710500001

  • Emitters of N-photon bundles NATURE PHOTONICS Sanchez Munoz, C., Del valle, E., Tudela, A. G., Mueller, K., Lichtmannecker, S., Kaniber, M., Tejedor, C., Finley, J. J., Laussy, F. P. 2014; 8 (7): 550-555
  • Lasing from individual GaAs-AlGaAs core-shell nanowires up to room temperature NATURE COMMUNICATIONS Mayer, B., Rudolph, D., Schnell, J., Morkoetter, S., Winnerl, J., Treu, J., Mueller, K., Bracher, G., Abstreiter, G., Koblmueller, G., Finley, J. J. 2013; 4

    Abstract

    Semiconductor nanowires are widely considered to be the next frontier in the drive towards ultra-small, highly efficient coherent light sources. While NW lasers in the visible and ultraviolet have been widely demonstrated, the major role of surface and Auger recombination has hindered their development in the near infrared. Here we report infrared lasing up to room temperature from individual core-shell GaAs-AlGaAs nanowires. When subject to pulsed optical excitation, NWs exhibit lasing, characterized by single-mode emission at 10 K with a linewidth <60 GHz. The major role of non-radiative surface recombination is obviated by the presence of an AlGaAs shell around the GaAs-active region. Remarkably low threshold pump power densities down to ~760 W cm(-2) are observed at 10 K, with a characteristic temperature of T(0)=109±12 K and lasing operation up to room temperature. Our results show that, by carefully designing the materials composition profile, high-performance infrared NW lasers can be realised using III/V semiconductors.

    View details for DOI 10.1038/ncomms3931

    View details for Web of Science ID 000329396500017

    View details for PubMedID 24304714

  • Acoustically regulated carrier injection into a single optically active quantum dot PHYSICAL REVIEW B Schuelein, F. J., Mueller, K., Bichler, M., Koblmueller, G., Finley, J. J., Wixforth, A., Krenner, H. J. 2013; 88 (8)
  • All optical quantum control of a spin-quantum state and ultrafast transduction into an electric current SCIENTIFIC REPORTS Mueller, K., Kaldewey, T., Ripszam, R., Wildmann, J. S., Bechtold, A., Bichler, M., Koblmueller, G., ABSTREITER, G., Finley, J. J. 2013; 3

    Abstract

    The ability to control and exploit quantum coherence and entanglement drives research across many fields ranging from ultra-cold quantum gases to spin systems in condensed matter. Transcending different physical systems, optical approaches have proven themselves to be particularly powerful, since they profit from the established toolbox of quantum optical techniques, are state-selective, contact-less and can be extremely fast. Here, we demonstrate how a precisely timed sequence of monochromatic ultrafast (~ 2-5 ps) optical pulses, with a well defined polarisation can be used to prepare arbitrary superpositions of exciton spin states in a semiconductor quantum dot, achieve ultrafast control of the spin-wavefunction without an applied magnetic field and make high fidelity read-out the quantum state in an arbitrary basis simply by detecting a strong (~ 2-10 pA) electric current flowing in an external circuit. The results obtained show that the combined quantum state preparation, control and read-out can be performed with a near-unity (≥97%) fidelity.

    View details for DOI 10.1038/srep01906

    View details for Web of Science ID 000319653100001

    View details for PubMedID 23719615

  • On-chip time resolved detection of quantum dot emission using integrated superconducting single photon detectors SCIENTIFIC REPORTS Reithmaier, G., Lichtmannecker, S., Reichert, T., HASCH, P., Mueller, K., Bichler, M., Gross, R., Finley, J. J. 2013; 3

    Abstract

    We report the routing of quantum light emitted by self-assembled InGaAs quantum dots (QDs) into the optical modes of a GaAs ridge waveguide and its efficient detection on-chip via evanescent coupling to NbN superconducting nanowire single photon detectors (SSPDs). The waveguide coupled SSPDs primarily detect QD luminescence, with scattered photons from the excitation laser onto the proximal detector being negligible by comparison. The SSPD detection efficiency from the evanescently coupled waveguide modes is shown to be two orders of magnitude larger when compared with operation under normal incidence illumination, due to the much longer optical interaction length. Furthermore, in-situ time resolved measurements performed using the integrated detector show an average QD spontaneous emission lifetime of 0.95 ns, measured with a timing jitter of only 72 ps. The performance metrics of the SSPD integrated directly onto GaAs nano-photonic hardware confirms the strong potential for on-chip few-photon quantum optics using such semiconductor-superconductor hybrid systems.

    View details for DOI 10.1038/srep01901

    View details for Web of Science ID 000319496300003

    View details for PubMedID 23712624

  • Probing ultrafast carrier tunneling dynamics in individual quantum dots and molecules ANNALEN DER PHYSIK Mueller, K., Bechtold, A., Ruppert, C., Kaldewey, T., Zecherle, M., Wildmann, J. S., Bichler, M., Krenner, H. J., Villas-Boas, J. M., Abstreiter, G., Betz, M., Finley, J. J. 2013; 525 (1-2): 49-58
  • Surface acoustic wave controlled charge dynamics in a thin InGaAs quantum well JETP LETTERS Schuelein, F. J., Pustiowski, J., Muller, K., Bichler, M., Koblmueller, G., Finley, J. J., Wixforth, A., Krenner, H. J. 2012; 95 (11): 575-580
  • High-fidelity optical preparation and coherent Larmor precession of a single hole in an (In,Ga)As quantum dot molecule PHYSICAL REVIEW B Mueller, K., Bechtold, A., Ruppert, C., Hautmann, C., Wildmann, J. S., Kaldewey, T., Bichler, M., Krenner, H. J., ABSTREITER, G., Betz, M., Finley, J. J. 2012; 85 (24)
  • Electrical Control of Interdot Electron Tunneling in a Double InGaAs Quantum-Dot Nanostructure PHYSICAL REVIEW LETTERS Mueller, K., Bechtold, A., Ruppert, C., Zecherle, M., Reithmaier, G., Bichler, M., Krenner, H. J., ABSTREITER, G., Holleitner, A. W., Villas-Boas, J. M., Betz, M., Finley, J. J. 2012; 108 (19)

    Abstract

    We employ ultrafast pump-probe spectroscopy to directly monitor electron tunneling between discrete orbital states in a pair of spatially separated quantum dots. Immediately after excitation, several peaks are observed in the pump-probe spectrum due to Coulomb interactions between the photogenerated charge carriers. By tuning the relative energy of the orbital states in the two dots and monitoring the temporal evolution of the pump-probe spectra the electron and hole tunneling times are separately measured and resonant tunneling between the two dots is shown to be mediated both by elastic and inelastic processes. Ultrafast (<5  ps) interdot tunneling is shown to occur over a surprisingly wide bandwidth, up to ∼8  meV, reflecting the spectrum of exciton-acoustic phonon coupling in the system.

    View details for DOI 10.1103/PhysRevLett.108.197402

    View details for Web of Science ID 000303761600021

    View details for PubMedID 23003087

  • Coupling of guided Surface Plasmon Polaritons to proximal self-assembled InGaAs Quantum Dots PHOTONIC AND PHONONIC PROPERTIES OF ENGINEERED NANOSTRUCTURES II Bracher, G., Schraml, K., Blauth, M., Jakubeit, C., Mueller, K., Koblmueller, G., Bichler, M., Kaniber, M., Finley, J. J. 2012; 8269

    View details for DOI 10.1117/12.908748

    View details for Web of Science ID 000302582400024

  • Probing ultrafast charge and spin dynamics in a quantum dot molecule ULTRAFAST PHENOMENA AND NANOPHOTONICS XVI Mueller, K., Bechtold, A., Ruppert, C., Krenner, H. J., Bichler, M., Villas-Boas, J. M., Abstreiter, G., Betz, M., Finley, J. J. 2012; 8260

    View details for DOI 10.1117/12.907795

    View details for Web of Science ID 000302550300001

  • Electrical control of the exciton-biexciton splitting in self-assembled InGaAs quantum dots NANOTECHNOLOGY Kaniber, M., Huck, M. F., Mueller, K., Clark, E. C., Troiani, F., Bichler, M., Krenner, H. J., Finley, J. J. 2011; 22 (32)

    Abstract

    The authors demonstrate how lateral electric fields can be used to precisely control the exciton-biexciton splitting in InGaAs quantum dots. By defining split-gate electrodes on the sample surface, optical studies show how the exciton transition can be tuned into resonance with the biexciton by exploiting the characteristically dissimilar DC Stark shifts. The results are compared to model calculations of the relative energies of the exciton and biexciton, demonstrating that the tuning can be traced to a dominance of hole-hole repulsion in the presence of a lateral field. Cascaded decay of the exciton-biexciton system enables the generation of entangled photon pairs without the need to suppress the fine structure splitting of the exciton. Our results demonstrate how the exciton-biexciton system can be electrically controlled.

    View details for DOI 10.1088/0957-4484/22/32/325202

    View details for Web of Science ID 000292931400002

    View details for PubMedID 21772067

  • Excited state quantum couplings and optical switching of an artificial molecule PHYSICAL REVIEW B Mueller, K., Reithmaier, G., Clark, E. C., Jovanov, V., Bichler, M., Krenner, H. J., Betz, M., ABSTREITER, G., Finley, J. 2011; 84 (8)
  • Nonresonant feeding of photonic crystal nanocavity modes by quantum dots JOURNAL OF APPLIED PHYSICS Laucht, A., Hauke, N., Neumann, A., Guenthner, T., Hofbauer, F., Mohtashami, A., Mueller, K., Boehm, G., Bichler, M., Amann, M., Kaniber, M., Finley, J. J. 2011; 109 (10)

    View details for DOI 10.1063/1.3576137

    View details for Web of Science ID 000292115900005

  • Enhanced photoluminescence emission from two-dimensional silicon photonic crystal nanocavities NEW JOURNAL OF PHYSICS Hauke, N., Zabel, T., Mueller, K., Kaniber, M., Laucht, A., Bougeard, D., ABSTREITER, G., Finley, J. J., Arakawa, Y. 2010; 12