Two different kinds of mesoscopic N-S-N junctions were fabricated by sandwiching Al or Pb film between two closely separated Au wires. dV/dI versus V curves for an Au-Pb-Au junction show a sharp zero-bias dip, while those for an Au-Al-Au show a reentrant zero-bias maximum. Interference between conjugate electrons and holes at an interface with different degree of transparency is responsible for the contrasting behavior.
Bibliographical noteFunding Information:
This work was supported by BSRI, MARC, and POSTECH under Contract Nos. 1NH9825602, 1MC9801301, and 1UD9900801, respectively.
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Electrical and Electronic Engineering