Noninvasive Probe of Charge Fractionalization in Quantum Spin-Hall Insulators

Details Noninvasive Probe of Charge Fractionalization in Quantum Spin-Hall Insulators Noninvasive Probe of Charge Fractionalization in Quantum Spin-Hall Insulators

2011-11-19

arxiv.org/abs/1111.4581v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

6 pages, 3 figures; submitted

Scientific paper

When an electron with well-defined momentum tunnels into a nonchiral Luttinger liquid, it breaks up into two separate wave packets that carry fractional charges and move in opposite directions. Observing this phenomenon has proven difficult, in part due to single-particle and plasmon backscattering caused by measurement probes. This Letter shows how a topological insulator RC circuit may be ideally suited for detecting fractional charges directly and in a noninvasive fashion.

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