Now showing items 1-16 of 16

    • Anomalous Expansion of Attractively Interacting Fermionic Atoms in an Optical Lattice 

      Hackermuller, Lucia; Schneider, Ulrich; Moreno-Cardoner, Maria; Kitagawa, Takuya; Will, Sebastian; Best, Thorsten; Demler, Eugene A.; Altman, Ehud; Bloch, Immanuel; Paredes, Belen (American Association for the Advancement of Science, 2010)
      Strong correlations can dramatically modify the thermodynamics of a quantum many-particle system. Especially intriguing behaviour can appear when the system adiabatically enters a strongly correlated regime, for the interplay ...
    • Cooling through Optimal Control of Quantum Evolution 

      Rahmani, Armin; Kitagawa, Takuya; Demler, Eugene A.; Chamon, Claudio (American Physical Society (APS), 2013)
      Nonadiabatic unitary evolution with tailored time-dependent Hamiltonians can prepare systems of cold-atomic gases with various desired properties such as low excess energies. For a system of two one-dimensional quasicondensates ...
    • Correlated Phases of Bosons in Tilted Frustrated Lattices 

      Pielawa, Susanne; Kitagawa, Takuya; Berg, Erez; Sachdev, Subir (American Physical Society, 2011)
      We study the "tilting" of Mott insulators of bosons into metastable states. These are described by Hamiltonians acting on resonant subspaces, and have rich possibilities for correlated phases with non-trivial entanglement ...
    • Direct measurement of the Zak phase in topological Bloch bands 

      Atala, Marcos; Aidelsburger, Monika; Barreiro, Julio T.; Abanin, Dmitry; Kitagawa, Takuya; Demler, Eugene A.; Bloch, Immanuel (Nature Publishing Group, 2013)
      Geometric phases that characterize the topological properties of Bloch bands play a fundamental role in the band theory of solids. Here we report on the measurement of the geometric phase acquired by cold atoms moving in ...
    • The Dynamics and Prethermalization of One Dimensional Quantum Systems Probed Through the Full Distributions of Quantum Noise 

      Kitagawa, Takuya; Imambekov, Adilet; Schmiedmayer, Jörg; Demler, Eugene A. (Institute of Physics, 2011)
      Quantum noise correlations have been employed in several areas in physics including condensed matter, quantum optics and ultracold atom to reveal non-classical states of the systems. So far, such analysis mostly focused ...
    • Exploring Topological Phases With Quantum Walks 

      Kitagawa, Takuya; Rudner, Mark; Berg, Erez; Demler, Eugene A. (American Physical Society, 2010)
      The quantum walk was originally proposed as a quantum mechanical analogue of the classical random walk, and has since become a powerful tool in quantum information science. In this paper, we show that discrete time quantum ...
    • Interferometric Approach to Measuring Band Topology in 2D Optical Lattices 

      Abanin, Dmitry; Kitagawa, Takuya; Bloch, Immanuel; Demler, Eugene A. (American Physical Society (APS), 2013)
      Recently, optical lattices with nonzero Berry’s phases of Bloch bands have been realized. New approaches for measuring Berry’s phases and topological properties of bands with experimental tools appropriate for ultracold ...
    • Majorana Fermions in Equilibrium and Driven Cold Atom Quantum Wires 

      Jiang, Liang; Kitagawa, Takuya; Alicea, Jason; Akhmerov, A.; Pekker, David; Refael, Gil; Cirac, J.; Demler, Eugene A.; Lukin, Mikhail D.; Zoller, Peter (American Physical Society, 2011)
      We introduce a new approach to create and detect Majorana fermions using optically trapped 1D fermionic atoms. In our proposed setup, two internal states of the atoms couple via an optical Raman transition--simultaneously ...
    • Multimode Dynamics and Emergence of a Characteristic Length Scale in a One-Dimensional Quantum System 

      Kuhnert, M.; Geiger, R.; Langen, T.; Gring, M.; Rauer, B.; Kitagawa, T; Demler, Eugene A.; Adu Smith, D.; Schmiedmayer, J. (American Physical Society (APS), 2013)
      We study the nonequilibrium dynamics of a coherently split one-dimensional Bose gas by measuring the full probability distribution functions of matter-wave interference. Observing the system on different length scales ...
    • New phenomena in non-equilibrium quantum physics 

      Kitagawa, Takuya (2013-10-08)
      From its beginning in the early 20th century, quantum theory has become progressively more important especially due to its contributions to the development of technologies. Quantum mechanics is crucial for current technology ...
    • Observation of Topologically Protected Bound States in Photonic Quantum Walks 

      Kitagawa, Takuya; Broome, Matthew A.; Fedrizzi, Alessandro; Rudner, Mark S.; Berg, Erez; Kassal, Ivan; Aspuru-Guzik, Alan; Demler, Eugene A.; White, Andrew G. (Nature Publishing Group, 2012)
      Topological phases exhibit some of the most striking phenomena in modern physics. Much of the rich behaviour of quantum Hall systems, topological insulators, and topological superconductors can be traced to the existence ...
    • Phase Sensitive Measurements of Order Parameters for Ultracold Atoms through Two Particles Interferometry 

      Kitagawa, Takuya; Aspect, Alain; Greiner, Markus; Demler, Eugene A. (2011)
      Nontrivial symmetry of order parameters is crucial in some of the most interesting quantum many-body states of ultracold atoms and condensed matter systems. Examples in cold atoms include p-wave Feshbach molecules and ...
    • Prethermalization Revealed by the Relaxation Dynamics of Full Distribution Functions 

      Adu Smith, D; Gring, M; Langen, T; Kuhnert, M; Rauer, B; Geiger, R; Kitagawa, T; Mazets, I; Demler, Eugene A.; Schmiedmayer, J (IOP Publishing, 2013)
      We detail the experimental observation of the non-equilibrium many-body phenomenon prethermalization. We study the dynamics of a rapidly and coherently split one-dimensional Bose gas. An analysis based on the use of full ...
    • Ramsey Interference in One-Dimensional Systems: The Full Distribution Function of Fringe Contrast as a Probe of Many-Body Dynamics 

      Kitagawa, Takuya; Pielawa, Susanne; Imambekov, Adilet; Schmiedmayer, Jörg; Gritsev, Vladimir; Demler, Eugene A. (American Physical Society, 2010)
      We theoretically analyze Ramsey interference experiments in one-dimensional quasicondensates and obtain explicit expressions for the time evolution of full distribution functions of fringe contrast. We show that distribution ...
    • Topological Characterization of Periodically-Driven Quantum Systems 

      Kitagawa, Takuya; Berg, Erez; Rudner, Mark; Demler, Eugene A. (American Physical Society, 2010)
      Topological properties of physical systems can lead to robust behaviors that are insensitive to microscopic details. Such topologically robust phenomena are not limited to static systems but can also appear in driven quantum ...
    • Transport Properties of Non-Equilibrium Systems Under the Application of Light: Photo-Induced Quantum Hall Insulators Without Landau Levels 

      Kitagawa, Takuya; Oka, Takashi; Brataas, Arne; Fu, Liang; Demler, Eugene A. (American Physical Society, 2011)
      In this paper, we study transport properties of nonequilibrium systems under the application of light in many-terminal measurements, using the Floquet picture. We propose and demonstrate that the quantum transport properties ...