Enhanced dielectric response by disordered nanoscale/mesoscopic insulators

Details Enhanced dielectric response by disordered nanoscale/mesoscopic insulators Enhanced dielectric response by disordered nanoscale/mesoscopic insulators

2006-05-09

arxiv.org/abs/cond-mat/0605215v3

Physical Review Letters 97, 266807 (2006)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages including 3 figures; minor revision; a high-resolution figure available at http://appi.t.u-tokyo.ac.jp/~sonoda/papers.

Scientific paper

Enhancement of the dielectric response of insulators by disorder is theoretically proposed, where the quantum interference of electronic waves through the nanoscale/mesoscopic system and its change due to external perturbations control the polarization. In the disordered case with all the states being localized, the resonant tunneling, which is topologically protected, plays a crucial role, and enhances the dielectric response by a factor 30~40 compared with the pure case. Realization of this idea with accessible materials/structures is also discussed.

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