Insulating antiferromagnets offer a rich playground to explore novel quantum phases of matter. Triangular lattice s=1/2 antiferromagnets are of especial interest due to their reduced dimensionality, low spin, and frustrating interactions which all conspire to disrupt magnetic order, as found experimentally in several instances. The resulting “quantum disordered” phases are expected to have nove...

During development, the growth of the embryo must be coupled to its patterning to ensure correct and timely morphogenesis. In the mouse embryo, migration of the anterior visceral endoderm (AVE) to the prospective anterior establishes the anterior-posterior (A-P) axis. By analysing the distribution of cells in S phase, M phase and G2 from the time just prior to the migration of the AVE until 18 ...

Miklós Antal Werner,1 Arne Brataas,2 Felix von Oppen,3 and Gergely Zaránd1 1MTA-BME Exotic Quantum Phases “Momentum” Research Group Department of Theoretical Physics, Budapest University of Technology and Economics, 1111 Budapest, Budafoki út 8, Hungary 2Department of Physics, Norwegian University of Science and Technology, NO-7491 Trondheim, Norway 3Dahlem Center for Complex Quantum Systems an...

I present a pedagogical survey of a variety of quantum phases of the Hubbard model. The honeycomb lattice model has a conformal field theory connecting the semi-metal to the insulator with Néel order. States with fractionalized excitations are linked to the deconfined phases of gauge theories. I also consider the confining phases of such gauge theories, and show how Berry phases of monopoles in...

It is widely held that mammalian cells make a decision in the G1 phase of the division cycle either to proceed through the cell cycle or to di!erentiate and cease growth and division (Hass, 1994; Herwig & Strauss, 1997; Loyer et al., 1996; Rifkind et al., 1996; Sherr, 1995; Wiman, 1993; Zavitz & Zipursky, 1997). This belief was originally derived from the general observation that di!erentiated ...

Variational wave functions containing electronic pairing and suppressed charge fluctuations (i.e., projected BCS states) have been proposed as the paradigm for disordered magnetic systems (including spin liquids). Here we discuss the general properties of these states in one and two dimensions, and show that different quantum phases may be described with high accuracy by the same class of varia...

Z.-X. Gong,1,2,* M. F. Maghrebi,1,2 A. Hu,1,3 M. Foss-Feig,1,2 P. Richerme,1,4 C. Monroe,1,2 and A. V. Gorshkov1,2 1Joint Quantum Institute, NIST/University of Maryland, College Park, Maryland 20742, USA 2Joint Center for Quantum Information and Computer Science, NIST/University of Maryland, College Park, Maryland 20742, USA 3Department of Physics, American University, Washington, DC 20016, USA...

The tobacco mitogen-activated protein kinase (MAPK) cascade, which includes MAPK NRK1/NTF6, positively regulates expansion of the cytokinetic machinery known as the phragmoplast, which is followed by the synthesis of cell plates for completion of cell division. However, molecular events lying between the MAPK and phragmoplast expansion were not known. Here, we show that NRK1/NTF6 phosphorylates...

The ground-state and low-energy properties of the two-dimensional J1−J2 Heisenberg model in the collinear phase are investigated using finite-size spin-wave theory [Q. F. Zhong and S. Sorella, Europhys. Lett. 21, 629 (1993)], and Lanczos exact diagonalizations. For spin one-half – where the effects of quantization are the strongest – the spinwave expansion turns out to be quantitatively accurat...

Studies from several laboratories have evaluated the role of cell surface antigenic molecules on target cells in natural killer (NK)-mediated cytotoxicity. A number of these cell surface molecules are associated with cell proliferation and may be expressed preferentially during one phase of the cell cycle. The purpose of this investigation was to evaluate the role that target cell cycle plays i...