7,052 research outputs found

    UCI and Entrepreneurship

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    Faculty reflection on VCU Great Bike Race Book course. Course Description: This course will guide students through the process of evaluating entrepreneurial opportunities with the intention of identifying viable businesses. YouTube video pitches: Winning Pitch And the other amazing pitches in no particular order: https://www.youtube.com/watch?v=XDKBakM0XH4 https://www.youtube.com/watch?v=h-RpEOObbHE https://www.youtube.com/watch?v=GdyLF_BXpTM https://www.youtube.com/watch?v=bSDuNX-_4go https://www.youtube.com/watch?v=SMEX4cSvkt4 https://www.youtube.com/watch?v=Ek7dvG92Ln

    Contrasting Pathways to Mott Gap Collapse in Electron and Hole Doped Cuprates

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    Recent ARPES measurements on the electron-doped cuprate Nd_{2-x}Ce_xCuO_4 can be interpreted in a mean field model of uniform doping of an antiferromagnet, with the Mott gap closing near optimal doping. Mode coupling calculations confirm the mean field results, while clarifying the relation between the Mott gap and short-range magnetic order. The same calculations find that hole doped cuprates should follow a strikingly different doping dependence, involving instability toward spiral phases or stripes. Nevertheless, the magnetic order (now associated with stripes) again collapses near optimal doping.Comment: 5 eps figures, revtex. Presented at the ``Workshop on Intrinsic Multiscale Structure and Dynamics in Complex Electronic Oxides'', at the International Center for Theoretical Physics, Trieste, Italy, July 1-4, 2002; to be published, in ``Intrinsic Multiscale Structure and Dynamics in Complex Electronic Oxides'', edited by A.R. Bishop, S.R. Shenoy, and S. Sridhar, World Scientific (2003

    Chaos in a Jahn-Teller Molecule

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    The Jahn-Teller system E x b_1 + b_2 has a particular degeneracy, where the vibronic potential has an elliptical minimum. In the general case where the ellipse does not reduce to a circle, the classical motion in the potential is chaotic, tending to trapping near one of the extrema of the ellipse. In the quantum problem, the motion consists of correlated tunneling from one extremum to the opposite, leading to an average angular momentum reminiscent of that of the better known E x e dynamic Jahn-Teller system.Comment: 7 eps figures, revtex. To be published, Phys. Rev.

    Van Hove Excitons and High-Tc_c Superconductivity: VIIIC Dynamic Jahn-Teller Effects vs Spin-Orbit Coupling in the LTO Phase of La2x_{2-x}Srx_xCuO4_4

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    The possible role of the van Hove singularity (vHs) in stabilizing the low-temperature orthorhombic (LTO) phase transition in La2x_{2-x}\-Srx_x\-CuO4_ 4 (LSCO) is discussed. It is found that the vHs can drive a structural distortion in two different ways, either due to spin-orbit coupling or to dynamic Jahn-Teller (JT) effects. This paper discusses the latter effect in some detail. It is shown that a model Hamiltonian introduced earlier to describe the coupled electron -- octahedral tilt motions (`cageons') has a series of phase transitions, from a high-temperature disordered JT phase (similar to the high-temperature tetragonal phase of LSCO) to an intermediate temperature dynamic JT phase, of average orthorhombic symmetry (the LTO phase) to a low temperature static JT phase (the low temperature tetragonal phase). For some parameter values, the static JT phase is absent.Comment: 28 pages plain TeX, 14 figures available upon request, NU-MARKIEWIC-93-0

    Choice of Exchange Rate Regime in Central and Eastern European Countries: an Empirical Analysis

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    This paper identifies the sources of divergences between current exchange rate policies in Central and Eastern European countries (CEECs). We use an ordered logit model for the official (de jure) and the actual (de facto) exchange rate classifications. We find that the differences of the exchange rate strategies among CEECs cannot be explained by these classifications. Financial and trade openness are the major determinants of divergences among exchange rate strategies in CEECs. More financially and trade integrated countries switch to more rigid regimes.