Noise spectroscopy and interlayer phase-coherence in bilayer quantum Hall systems

Details Noise spectroscopy and interlayer phase-coherence in bilayer quantum Hall systems Noise spectroscopy and interlayer phase-coherence in bilayer quantum Hall systems

2003-10-29

arxiv.org/abs/cond-mat/0310676v1

Phys. Rev. Lett. 92, 086803 (2004).

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 2 figures

Scientific paper

10.1103/PhysRevLett.92.086803

Bilayer quantum Hall systems develop strong interlayer phase-coherence when the distance between layers is comparable to the typical distance between electrons within a layer. The phase-coherent state has until now been investigated primarily via transport measurements. We argue here that interlayer current and charge-imbalance noise studies in these systems will be able to address some of the key experimental questions. We show that the characteristic frequency of current-noise is that of the zero wavevector collective mode, which is sensitive to the degree of order in the system. Local electric potential noise measured in a plane above the bilayer system on the other hand is sensitive to finite-wavevector collective modes and hence to the soft-magnetoroton picture of the order-disorder phase transition.

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