Abstract
In layered samples which exhibit a bulk quantum Hall effect (QHE), a two-dimensional (2D) surface ``sheath'' of gapless excitations is expected. These excitations comprise a novel 2D chiral quantum liquid which should dominate the low temperature transport along the field ( $z$ axis). For the integer QHE, we show that localization effects are completely absent in the ``sheath,'' giving a metallic $z$-axis conductivity. For fractional filling $\ensuremath{\nu}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}1/3$, the sheath is a 2D non-Fermi-liquid, with incoherent $z$-axis transport and ${\ensuremath{\sigma}}_{\mathrm{zz}}\ensuremath{\sim}{T}^{3}$. Experimental implications for the Bechgaard salts are discussed.
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