Electronic structure ofα-Ga

Abstract

We have determined the electronic structure of ␣-Ga using angle-resolved photoemission from the ␣-Ga͑010͒ surface. Data were collected both at 78 K and at 273 K, i.e., below and above the temperature of the surface phase transition. We observe a number of relatively flat bands reflecting the partly covalent character of ␣-Ga. Our results agree fairly well with recent band-structure calculations.

The surface phase transition and low-temperature phase of α-Ga(0 1 0) studied by SPA-LEED

“…The imperfection of the surface due to the presence of steps produces a rounding of the intensity behaviour in the critical region and a shift of T c . Nevertheless our estimated critical temperature is very close to the value found in photoemission measurements [4].…”

“…In particular, it appears that the structure observed by STM (mainly ð2 Â 2Þ) is not compatible with the LEED pattern of the low-temperature phase reported here and in Refs. [3,4,8].…”

“…The first is the fact that the surface appears to be stable even above the bulk melting point of 303 K [1,2]. The second is a phase transition at about T c ¼ 231 K [3,4] which is accompanied by changes in the surface electronic structure and in the Ga 3d core level spectra. The transition also has a pronounced effect on the lifetime of the occupied surface states [4].…”

Universal magnetic-field-driven metal-insulator-metal transformations in graphite and bismuth

“…It should be emphasized that according to Refs. [25,26] surface states in Bi are situated very near the Fermi level, leading to reduced effective dimensionality, a fact which has not been previously taken into account.…”

Surface plasmon polariton guiding by chains of nanoparticles

“…Experimental [9][10][11][12][13] studies showed that nanoparticle ensembles on metal surface can be used to create efficient micro-optical elements for SPP's, such as mirrors, beam splitters and interferometers. Furthermore, periodic arrays of metal surface nanoparticles have been shown to exhibit band gap properties for SPP's [14][15][16]. If such an SPP band gap structure has narrow channels free from the particles, then SPP's can be confined to and guided along these channels [16][17][18].…”