Possible evidence of non-Fermi liquid behavior from quasi-one-dimensional indium nanowires

Abstract

We report possible evidence of non-Fermi liquid (NFL) observed at room temperature from the quasi one-dimensional (1D) indium (In) nanowires self-assembled on Si(111)-7$\times$7 surface. Using high-resolution electron-energy-loss spectroscopy, we have measured energy and width dispersions of a low energy intrasubband plasmon excitation in the In nanowires. We observe the energy-momentum dispersion $\omega$(q) in the low q limit exactly as predicted by both NFL theory and the random-phase-approximation. The unusual non-analytic width dispersion $\zeta (q)\sim q^{\alpha }$ measured with an exponent $\alpha$=1.40$\pm$0.24, however, is understood only by the NFL theory. Such an abnormal width dispersion of low energy excitations may probe the NFL feature of a non-ideal 1D interacting electron system despite the significantly suppressed spin-charge separation ($\le$40 meV).

11 pages and 4 figures

References in corpus (6)

• One-Dimensional Fermi liquids
• Spin-charge separation and localization in one-dimension
• Structure determination of the indium-induced Si(111)-(4x1) reconstruction by surface x-ray diffraction
• Dynamical response of a one dimensional quantum wire electron system
• Plasmon excitations and 1D - 2D dimensional crossover in quantum crossbars
• Damping of long-wavelength collective excitations in quasi-onedimensional Fermi liquids

Cited by in corpus (2)

• Self-trapping nature of Tl nanoclusters on Si(111)-7$\times$7 surface
• Dimensionality of metallic atomic wires on surfaces