Even below its normal melting temperature, ice melts when subjected to high pressure and refreezes once the pressure is lifted. A classic demonstration of this regelation phenomenon is the passing of a thin wire through a block of ice when sufficient force is exerted. Here we present a molecular-dynamics study of a nanowire cutting through ice to unravel the molecular level mechanisms responsib...

The development of metal oxide-based molecular wires is important for fundamental research and potential practical applications. However, examples of these materials are rare. Here we report an all-inorganic transition metal oxide molecular wire prepared by disassembly of larger crystals. The wires are comprised of molybdenum(VI) with either tellurium(IV) or selenium(IV): {(NH4)2[XMo6O21]}n (X=...

We present a self-consistent method for the evaluation of the electronic current flowing through a multi-terminal molecular wire. The method is based on Büttiker-Landauer theory which relates the current to one-electron scattering probabilities. The scattering problem is solved using a tight-binding form for Schrödinger’s equation that incorporates a self-consistent evaluation of the electro-st...

The historical relationship between population and agricultural resources is at the core of many key and long-standing anthropological debates (e.g., Boserup 1965; Brookfield 1972; Brown and Podolefsky 1976; Cohen 1977; Grigg 1979; Johnson and Earle 1987; Morrison 1996, with CA comments; Netting 1993; Turner et al. 1977; Turner et al. 1993). In Mesoamerica, the arguments have focused on the dis...

The electronic conduction of a novel, three-terminal molecular architecture, analogous to a heterojunction bipolar transistor is studied. In this architecture, two diode arms consisting of donor-acceptor molecular wires fuse through a ring, while a gate modulating wire is a conjugated wire. The calculated results show the enhancement or depletion mode of a transistor by applying a gate field a...

The electronic conduction of a novel, three-terminal molecular architecture, analogous to a heterojunction bipolar transistor, is studied. In this architecture, two diode arms consisting of donor-acceptor molecular wires fuse through a ring, while a gate modulating wire is a pi-conjugated wire. The calculated results show the enhancement or depletion mode of a transistor on applying a gate fiel...