Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2010-05-25
New J. Phys. 9, 249 (2007)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
11 pages and 4 figures
Scientific paper
10.1088/1367-2630/9/8/249
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$0.24, however, is understood only by the NFL theory. Such an abnormal width dispersion of low energy excitations may probe the NFL feature of a non-ideal 1D interacting electron system despite the significantly suppressed spin-charge separation ($\leq$40 meV).
Chung Jinwook
Hwang Choongyu
Kim Namdong
Shin Sunyoung
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