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      • Dept. of Physics - Master's degree
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      A microscopic approach to phononic energy transfer in nano structures

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      Author
      Özpineci, Altuğ
      Advisor
      Çıracı, Salim
      Date
      1999
      Publisher
      Bilkent University
      Language
      English
      Type
      Thesis
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      Abstract
      Understanding of mechanisms for the energy transfer from and/or through nano particles in contact with the large samples have become important in various biological processes, molecular electronics and friction. In this thesis, the phononic heat conductance of an atomic wire between two reservoirs, and the vibrational relaxation of an atom adsorbed on a surface is studied. The former problem is studied using the Keldysh formalism which yields the steady state properties of the system. The dependence of the total conductance on temperature, on the number of atoms in the wire and on the coefficient is studied. It is found that the conductance shows quantal structure similar to the electronic counterpart. The reduced density matrix is used to study the latter problem. The time evolution of the reduced density matrix has been evaluated for an arbitrary system coupled to a heat bath. The formalism is then applied to study the vibrational relaxation of an atom adsorbed on a surface. The frequency dependence of the relaxation time is also determined.
      Keywords
      Heat Conductance
      Keldysh Formalism
      Phononic Heat Conductance Quantization
      Reduced Density Matrix
      Vibrational Relaxation
      Permalink
      http://hdl.handle.net/11693/18131
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      • Dept. of Physics - Master's degree 160
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