Frequency dependent transport in a quantum wire
G. Cuniberti , M. Sassetti, and B. Kramer
II INFM Meeting: ``Congresso Nazionale di Fisica della Materia''
1998.06; Rimini, Italy
Several examples of frequency dependent phenomena in
quantum wires, which display interaction and
correlation effects, are presented. Inelastic
light scattering allows for the investigation of
the electronic charge and spin density collective
excitation. It is shown that the so called intraband
``Single Particle Excitation'' observed in the
polarized spectra [1,2] are identified as signatures of
the collective spin-density excitations . They
appear in the ``polarized configuration'' (parallel
polarization of incoming and outgoing light) due to a
resonance-induced relaxation of the commonly accepted
selection rule which predicts that the spin density
excitations can only appear in the non-polarized
configuration. The complex AC response of a quantum
wire with an interaction potential of finite range is
also investigated . The influence of the screening
of the electric field is shown. The complex absorptive
conductance is analyzed in terms of resistive,
capacitive and inductive behaviors.
 A. R.
Goi et al., Phys. Rev. Lett. 67, 3298
 C. Schüller et al., Phys.
Rev. B 54, R17304 (1996).
 M. Sassetti
and B. Kramer, Phys. Rev. Lett. 80, 1485
 G. Cuniberti, M. Sassetti, and B.
Kramer, Phys. Rev. B 57, 1515 (1998).
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Prof. Dr. Gianaurelio Cuniberti
Institute for Materials Science
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01062 Dresden, Germany