Metallic Behavior of Cyclotron Relaxation Time in Two-Dimensional Systems

Details Metallic Behavior of Cyclotron Relaxation Time in Two-Dimensional Systems Metallic Behavior of Cyclotron Relaxation Time in Two-Dimensional Systems

2011-05-24

arxiv.org/abs/1105.4778v1

Phys. Rev. Lett. 106, 196404 (2011)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 3 figures

Scientific paper

Cyclotron resonance of two-dimensional electrons is studied at low temperatures down to 0.4 K for a high-mobility Si/SiGe quantum well which exhibits a metallic temperature dependence of dc resistivity $\rho$. The relaxation time $\tau_{\rm CR}$ shows a negative temperature dependence, which is similar to that of the transport scattering time $\tau_t$ obtained from $\rho$. The ratio $\tau_{\rm CR}/\tau_t$ at 0.4 K increases as the electron density $N_s$ decreases, and exceeds unity when $N_s$ approaches the critical density for the metal-insulator transition.

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