Abstract
It is predicted that in a charge-density-wave (CDW) ring-shaped conductor, placed in an external vector-potential field, there should appear a new Aharonov-Bohm contribution to the magnetic susceptibility and the electrical conductivity oscillating as a function of the flux with the period ${\mathrm{\ensuremath{\Phi}}}_{0}$=hc/2e. This contribution arises from instanton transitions between degenerate vacua of the CDW condensate and is the solid-state realization of \ensuremath{\Theta} vacuum in quantum field theory. The period transforms into ${\mathrm{\ensuremath{\Phi}}}_{0}$/N in N strongly correlated parallel CDW chains.
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