Phys. Rev. Lett. 72, 1968–1971 (1994)Exact c=1 boundary conformal field theoriesReceived 17 November 1993; published in the issue dated 28 March 1994 We present a solution of the problem of a free massless scalar field on the half line interacting through a sinusoidal potential on the boundary. For a critical value of the period, this system is a conformal field theory with a nontrivial and explicitly calculable S matrix for scattering from the boundary. It describes the critical behavior of a number of condensed matter systems, including dissipative quantum mechanics and of barriers in ‘‘quantum wires.’’ © 1994 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.72.1968
DOI:
10.1103/PhysRevLett.72.1968
PACS:
11.25.Hf, 05.70.Jk
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