Keisuke Fukutani

Symmetry-protected surface state on Mo(1 1 2)

We report the experimental identification of a symmetry-protected surface state on Mo(1 1 2). The utilization of photon-energy- and polarization-dependent angle-resolved photoemission spectroscopy clearly demonstrates that this true surface state preserves its two-dimensional character despite the fact that it resides within the projection of the bulk bands along the ̅Γ-̅X line of the surface Brillouin zone. This surface state on Mo(1 1 2) exists due to the forbidden hybridization between the bulk and the surface states, each of which possesses different state symmetries within the crystal. The experimental identification of such a surface state possibly opens up pathways towards controlled manipulation between true surface states and the surface resonances (i.e. between two-dimensional and quasi-two-dimensional states) by breaking the symmetry of the crystal surface.

The electron?phonon coupling at the Mo(112) surface

We investigated the electron-phonon coupling (EPC), in the vicinity of the Fermi level, for the surface-weighted states of Mo(112) from high resolution angle-resolved photoemission data taken parallel to the surface corrugation (i.e. [Formula: see text]). The surface-weighted bandwidth may be discussed in terms of electron-electron interactions, electron impurity scattering and electron-phonon coupling and exhibits a mass enhancement factor λ = 0.42, within the Debye model, determined from the experimentally derived self-energy. Gold overlayers suppress the mass enhancement of the Mo(112) surface-weighted band crossing the Fermi level at 0.54 Å(-1).

Tunable two-dimensional electron gas at the surface of thermoelectric materialIn4Se3

We report the discovery of two-dimensional electron gas (2DEG) at the surface of thermoelectric material In

High-Resolution Angle-Resolved Photoemission Study of Quasi-One-Dimensional Semiconductor In4Se3

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Direct graphene growth on MgO: origin of the band gap

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Organic spin valves with inelastic tunneling characteristics

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Fermi surface of Mo(112) and indirect interaction between adsorbed atoms

by angle-resolved photoemission spectroscopy. The observed 2DEG exhibits a nearly isotropic band dispersion with a considerably small effective mass of m* = 0.16 m_0, and its carrier density shows a significant temperature dependence, leading to unconventional metal-semiconductor transition at the surface. The observed wide-range thermal tunability of 2DEG in In

Order–disorder transition for corrugated Au layers

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New view of the occupied band structure of Mo(112)

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Haloform adsorption on crystalline copolymer films of vinylidene fluoride with trifluoroethylene

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