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제목 PRL 107, 136402
작성자 관리자
조회수 1194 등록일시 2012-09-04 13:43

136402.jpg

 

Title : Radial Band Structure of Electrons in Liquid Metals

 

The electronic band structure of a liquid metal was investigated by measuring precisely the evolution of angle-resolved photoelectron spectra during the melting of a Pb monolayer on a Si(111) surface. We found that the liquid monolayer exhibits a free-electron-like band and it undergoes a coherent radial scattering, imposed by the radial correlation of constituent atoms, to form a characteristic secondary hole band. These unique double-radial bands and their gradual evolution during melting can be quantitatively reproduced, including detailed spectral intensity profiles, with our radial scattering model based on a theoretical prediction of 1962. Our result establishes the radial band structure as a key concept for describing the nature of electrons in strongly disordered states of matter.

Figure : Experimental Fermi surface (FS) data of a Pb monolayer on a Si(111) surface at various marked temperatures. Overlaid in 90 K data is the band theory calculation [K. S. Kim, S. C. Jung, M. H. Kang, and H.W. Yeom, Phys. Rev. Lett. 104, 246803 (2010), S. C. Jung and M. H. Kang, Surf. Sci. 605, 551 (2011)], and dashed lines indicate the Si(111)1x1 Brillouin zone. Across Tc ~ 285 K, the complex FS reduces into a large outer and a smaller inner FS (white lines), the latter of which gradually transforms from a circle to a hexagon with further increasing temperature. The other weak features (gray lines) are due to remaining substrate potentials. The white dots at 600 K are band-peak positions obtained by fitting the radial spectral profiles. The red dots show the midpoints of inner and outer FSs in the radial direction.

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