Now showing items 31456-31475 of 33849

    • Topological states in photonic systems 

      Lu, Ling; Joannopoulos, John; Soljacic, Marin (Nature Publishing Group, 2016-06)
      Optics played a key role in the discovery of geometric phase. It now joins the journey of exploring topological physics, bringing bosonic topological states that equip us with the ability to make perfect photonic devices ...
    • Topological subsystem codes 

      Bombin, Hector (American Physical Society, 2010-03)
      We introduce a family of two-dimensional (2D) topological subsystem quantum error-correcting codes. The gauge group is generated by two-local Pauli operators, so that two-local measurements are enough to recover the error ...
    • Topological superconductivity and Majorana fermions in metallic surface states 

      Potter, Andrew Cole; Lee, Patrick A. (American Physical Society, 2012-03)
      Heavy metals, such as Au, Ag, and Pb, often have sharp surface states that are split by strong Rashba spin-orbit coupling. The strong spin-orbit coupling and two-dimensional nature of these surface states make them ideal ...
    • Topological superconductor in quasi-one-dimensional Tl[subscript 2 − x]Mo[subscript 6]Se[subscript 6] 

      Huang, Shin-Ming; Hsu, Chuang-Han; Lee, Chi-Cheng; Shiau, Shiue-Yuan; Lin, Hsin; e.a. (American Physical Society, 2018-01)
      We propose that the quasi-one-dimensional molybdenum selenide compound Tl[subscript 2−x]Mo[subscript 6]Se[subscript 6] is a time-reversal-invariant topological superconductor induced by intersublattice pairing, even in the ...
    • Topological superconductors as nonrelativistic limits of Jackiw-Rossi and Jackiw-Rebbi models 

      Nishida, Yusuke; Santos, Luiz; Chamon, Claudio (American Physical Society, 2010-10)
      We argue that the nonrelativistic Hamiltonian of px+ipy superconductor in two dimensions can be derived from the relativistic Jackiw-Rossi model by taking the limit of large Zeeman magnetic field and chemical potential. ...
    • Topological surface electronic states in candidate nodal-line semimetal CaAgAs 

      Wang, Xiao-Bo; Ma, Xiao-Ming; Emmanouilidou, Eve; Shen, Bing; Hsu, Chia-Hsiu; e.a. (American Physical Society, 2017-10)
      We investigate systematically the bulk and surface electronic structure of the candidate nodal-line semimetal CaAgAs by angle-resolved photoemission spectroscopy and density functional calculations. We observed a metallic, ...
    • Topological Transition in a Non-Hermitian Quantum Walk 

      Levitov, Leonid; Rudner, Mark Spencer (American Physical Society, 2009-02)
      We analyze a quantum walk on a bipartite one-dimensional lattice, in which the particle can decay whenever it visits one of the two sublattices. The corresponding non-Hermitian tight-binding problem with a complex potential ...
    • Topological Valley Currents in Gapped Dirac Materials 

      Lensky, Yuri D.; Song, Justin C. W.; Samutpraphoot, Polnop; Levitov, Leonid (American Physical Society, 2015-06)
      Gapped 2D Dirac materials, in which inversion symmetry is broken by a gap-opening perturbation, feature a unique valley transport regime. Topological valley currents in such materials are dominated by bulk currents produced ...
    • Topologically enabled optical nanomotors 

      Kaminer, Ido; Miller, Owen D.; Buljan, Hrvoje; Ilic, Ognjen; Zhen, Bo; e.a. (American Association for the Advancement of Science (AAAS), 2016-11)
      Shaping the topology of light, by way of spin or orbital angular momentum engineering, is a powerful tool to manipulate matter on the nanoscale. Conventionally, such methods focus on shaping the incident beam of light and ...
    • Topologically Entangled Rashba-Split Shockley States on the Surface of Grey Arsenic 

      Zhang, Peng; Ma, J.-Z.; Ishida, Y.; Zhao, L.-X.; Xu, Q.-N.; e.a. (American Physical Society, 2017-01)
      We discover a pair of spin-polarized surface bands on the (111) face of grey arsenic by using angle-resolved photoemission spectroscopy (ARPES). In the occupied side, the pair resembles typical nearly-free-electron Shockley ...
    • Topologically protected excitons in porphyrin thin films 

      Saikin, Semion K.; Yao, Norman Y.; Yuen, Joel; Aspuru-Guzik, Alan (Nature Publishing Group, 2014-09)
      he control of exciton transport in organic materials is of fundamental importance for the development of efficient light-harvesting systems. This transport is easily deteriorated by traps in the disordered energy landscape. ...
    • Topologies: The Urban Utopia in France, 1960–1970 (review) 

      Ferng, Jennifer H. (MIT Press, 2009-02)
      Reviewed by Jennifer Ferng, Department of Architecture, Massachusetts Institute of Technology. E-mail: <jferng@mit.edu>. Bobigny, La Courneuve and Sarcelles, as well as other planning projects such as Maine-Montparnasse ...
    • Topology and shape optimization of induced-charge electro-osmotic micropumps 

      Gregersen, M. M.; Okkels, F.; Bazant, Martin Z.; Bruus, Henrik (Institute of Physics, 2009-07)
      For a dielectric solid surrounded by an electrolyte and positioned inside an externally biased parallel-plate capacitor, we study numerically how the resulting induced-charge electro-osmotic (ICEO) flow depends on the ...
    • Topology control for wireless networks with highly-directional antennas 

      Stahlbuhk, Thomas B.; Shrader, Brooke E.; Modiano, Eytan H (Institute of Electrical and Electronics Engineers (IEEE), 2016-06)
      In order to steer antenna beams towards one another for communication, wireless nodes with highly-directional antennas must track the channel state of their neighbors. To keep this overhead manageable, each node must limit ...
    • Topology Discovery of Sparse Random Graphs With Few Participants 

      Anandkumar, Animashree; Hassidim, Avinatan; Kelner, Jonathan Adam (Association for Computing Machinery, 2011-06)
      We consider the task of topology discovery of sparse random graphs using end-to-end random measurements (e.g., delay) between a subset of nodes, referred to as the participants. The rest of the nodes are hidden, and do not ...
    • Topology effects on protein–polymer block copolymer self-assembly 

      Suguri, Takuya; Olsen, Bradley D (Royal Society of Chemistry, The, 2019-03)
      Bioconjugates made of the model red fluorescent protein mCherry and synthetic polymer blocks show that topology, i.e. the BA, BA2, ABA and ABC chain structure of the block copolymers, where B represents the protein and ...
    • Topology on a new facet of bismuth 

      Ma, Qiong; Xu, Su-Yang; Fu, Liang (Proceedings of the National Academy of Sciences, 2019-06-13)
      Bismuth-based materials have been instrumental in the development of topological physics, even though bulk bismuth itself has been long thought to be topologically trivial. A recent study has, however, shown that bismuth ...
    • Topology optimization and 3D printing of multimaterial magnetic actuators and displays 

      Sundaram, Subramanian; Skouras, Melina; Kim, David Saerom; van den Heuvel, Louise; Matusik, Wojciech (American Association for the Advancement of Science (AAAS), 2019-07)
      Upcoming actuation systems will be required to perform multiple tightly coupled functions analogous to their natural counterparts; e.g., the ability to control displacements and high-resolution appearance simultaneously ...
    • Topology optimization of freeform large-area metasurfaces 

      Lin, Zin; Liu, Victor; Pestourie, Raphael; Johnson, Steven G (The Optical Society, 2019-05)
      We demonstrate optimization of optical metasurfaces over 10⁵–10⁶ degrees of freedom in two and three dimensions, 100–1000+ wavelengths (λ) in diameter, with 100+ parameters per λ². In particular, we show how topology ...
    • Topology, Delocalization via Average Symmetry and the Symplectic Anderson Transition 

      Fu, Liang; Kane, C. L. (American Physical Society, 2012-12)
      A field theory of the Anderson transition in two-dimensional disordered systems with spin-orbit interactions and time-reversal symmetry is developed, in which the proliferation of vortexlike topological defects is essential ...