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cond-mat.stat-mech2009
Continuum and lattice heat currents for oscillator chains
Onuttom Narayan, A. P. Young
We show that two commonly used definitions for the heat current give different results--through the Kubo formula--for the heat conductivity of oscillator chains. The difference exi…
cond-mat.stat-mech2004
Free energies in the presence of electric and magnetic fields
Onuttom Narayan, A. P. Young
We discuss different free energies for materials in static electric and magnetic fields. We explain what the corresponding Hamiltonians are, and describe which choice gives rise to…