656 research outputs found
Robust quantization of a molecular motor motion in a stochastic environment
We explore quantization of the response of a molecular motor to periodic
modulation of control parameters. We formulate the Pumping-Quantization Theorem
(PQT) that identifies the conditions for robust integer quantized behavior of a
periodically driven molecular machine. Implication of PQT on experiments with
catenane molecules are discussed.Comment: 7 pages, 4 figures. J. Chem. Phys. Communications (in press
Non-linear non-local molecular electrodynamics with nano-optical fields
The interaction of optical fields sculpted on the nano-scale with matter may
not be described by the dipole approximation since the fields vary appreciably
across the molecular length scale. Rather than incrementally adding higher
multipoles it is advantageous and more physically transparent to describe the
optical process using non-local response functions that intrinsically include
all multipoles. We present a semi-classical approach to the non-linear response
functions based on the minimal coupling Hamiltonian. The first, second and
third order non-local response functions are expressed in terms of correlation
functions of the charge and the current densities. This approach is based on
the gauge invariant current rather than the polarization, and on the vector
potential rather than the electric and magnetic fields.Comment: 21 pages with reference
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