Charge-density wave tunnel junctions
Abstract
Charge-density waves (CDW) arise due to a BCS-like condensate of electron-hole pairs which is expected to produce peaks in the quasiparticle density of states at energies corresponding to Δ of the fermi level, where Δ is the gap energy of the condensate. We have fabricated a CDW-CDW point contact in the CDW conductor NbSe_3, in which the differential conductance exhibits peaks at 190 meV and 105 meV. The low energy peak disappears above T_P2=59K, the higher energy peak disappears above T_P1=145K. The measured peak energies correspond closely to values of 2Δ obtained by ARPES, scanning tunneling microscopy and gold-NbSe3 point contacts. This evidence strongly suggests that our system is behaving like a CDW-insulating-CDW tunnel barrier.
- Publication:
-
APS March Meeting Abstracts
- Pub Date:
- March 2003
- Bibcode:
- 2003APS..MARH20004O