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Physical Review B 71 , 132504 (2005) Physical Review Letters 93 , 157006, (2004)

Interference-Driven Conductivity Oscillations in Molecular Conductors M.J. Naughton, Boston College, DMR-0308973.

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Physical Review B 71 , 132504 (2005) Physical Review Letters 93 , 157006, (2004)

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  1. Interference-Driven Conductivity Oscillations in Molecular ConductorsM.J. Naughton, Boston College, DMR-0308973 Electrons are quantum entities, having both wave and particle properties. The latter is responsible for our daily experience with electricity and electronics, while the former is usually only revealed in special nanoscale devices. Here, this wave nature is directly seen in macroscopic crystals of the molecular organic conductor (TMTSF)2ClO4 in a strong magnetic field. It results from the materials’ intrinsic low dimensionality, with electrons confined to move most easily along 1-D chains. In a tilted magnetic field, electron waves self-interfere, causing dramatic oscillations in the conductivity as field orientation or magnitude is swept. Contour plot of electrical conductivity (red/high, blue/low) versus magnetic field along (horizontal axis) and perpendicular to (vertical) the 1-D chain axis in (TMTSF)2ClO4. The orange-yellow features along the diagonals represent interference-driven conductivity oscillations. Physical Review B 71, 132504 (2005) Physical Review Letters 93, 157006, (2004) Cond-Mat/0503649

  2. Interference-Driven Conductivity Oscillations in Molecular ConductorsM.J. Naughton, Boston College, DMR-0308973 Education: One high school student (Tom Runyon), one undergraduate student (Matt Wagar), and two graduate students (Pashupati Dhakal and Heon-Ick Ha) contributed to this project. Tom is now an undergrad-uate physics and math major at BC, and Heon-Ick is a post-doc in physics at Harvard. Also, one visiting scientist, Harukazu Yoshino, Osaka City University, doing a sabbbatical at BC, and two external collaborators, Victor Yakovenko, University of Maryland, and Andrei Lebed, University of Arizona, contributed to this project. Societal Impact: Conveying the importance and relevance of condensed matter physics can be facilitated with meaningful, even appealing, imagery of physical phenomena. By using plots of calculations, supported by experiment, of how electrons move about in confined geometries, such as quasi-1D and 2D, in real materials, we hope to both better understand and better communicate the excitement of molecular conductor physics.

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