Phys. Rev. Lett. 92, 226404 (2004) [4 pages]Anisotropic Metal-Insulator Transition in Epitaxial Thin FilmsReceived 16 October 2003; published 3 June 2004 By comparing the properties of In and Pb quantum wells in a scanning tunneling microscopy subsurface imaging experiment, we found the existence of lateral bound states, a 2D Mott-Hubbard correlation gap, induced by transverse confinement. Its formation is attributed to spin or charge overscreening of quasi-2D excitations. The signature of the 2D confinement-deconfinement transition is also experimentally observed, with the correlation gap being pinned in the middle of the conduction band. A self-organized 2D Anderson lattice is suggested as a new ground state. © 2004 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.92.226404
DOI:
10.1103/PhysRevLett.92.226404
PACS:
71.27.+a, 68.37.Ef, 71.30.+h, 73.22.–f
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