In-Chain Tunneling Through Charge-Density Wave Nanoconstrictions and Break-Junctions

Details In-Chain Tunneling Through Charge-Density Wave Nanoconstrictions and Break-Junctions In-Chain Tunneling Through Charge-Density Wave Nanoconstrictions and Break-Junctions

2005-09-07

arxiv.org/abs/cond-mat/0509171v3

Physical Review Letters 96, 096402 (2006)

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 3 figures, submitted to physical review letters

Scientific paper

10.1103/PhysRevLett.96.096402

We have fabricated longitudinal nanoconstrictions in the charge-density wave conductor (CDW) NbSe$_{3}$ using a focused ion beam and using a mechanically controlled break-junction technique. Conductance peaks are observed below the T$_{P1}$$=145 $K and T$_{P2}$$=59 $K CDW transitions, which correspond closely with previous values of the full CDW gaps $2\Delta_{1}$ and $2\Delta_{2}$ obtained from photo-emission. These results can be explained by assuming CDW-CDW tunneling in the presence of an energy gap corrugation $\epsilon_{2}$ comparable to $\Delta_{2}$, which eliminates expected peak at $\Delta_{1}+\Delta_{2}$. The nanometer length-scales our experiments imply indicate that an alternative explanation based on tunneling through back-to-back CDW-normal junctions is unlikely.

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