Interlayer Tunneling in Double-Layer Quantum Hall Pseudoferromagnets
Abstract
We show that the interlayer tunneling I-V in double-layer quantum Hall states displays a rich behavior which depends on the relative magnitude of sample size, voltage length scale, current screening, disorder, and thermal lengths. For weak tunneling, we predict a negative differential conductance of a power-law shape crossing over to a sharp zero-bias peak. An in-plane magnetic field splits this zero-bias peak, leading instead to a ``derivative'' feature at VB\(B∥\) = 2πħvB∥d/eφ0, which gives a direct measurement of the dispersion of the Goldstone mode corresponding to the spontaneous symmetry breaking of the double-layer Hall state.
- Publication:
-
Physical Review Letters
- Pub Date:
- February 2001
- DOI:
- 10.1103/PhysRevLett.86.1825
- arXiv:
- arXiv:cond-mat/0006450
- Bibcode:
- 2001PhRvL..86.1825B
- Keywords:
-
- Condensed Matter - Mesoscale and Nanoscale Physics;
- Condensed Matter - Strongly Correlated Electrons
- E-Print:
- 4 pgs. RevTex, submitted to Phys. Rev. Lett