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Optical properties of the quasi-two-dimensional dichalcogenides 2H-TaSe2 and 2H-NbSe2 (Articolo in rivista)

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Optical properties of the quasi-two-dimensional dichalcogenides 2H-TaSe2 and 2H-NbSe2 (Articolo in rivista) (literal)

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S.V. Dordevic1, D.N. Basov1, R.C. Dynes1, B. Ruzicka2, V. Vescoli2, L. Degiorgi2,a, H. Berger3, R. Gaal3, L. Forro3, and E. Bucher4 (2003)
Optical properties of the quasi-two-dimensional dichalcogenides 2H-TaSe2 and 2H-NbSe2
in The European physical journal. B, Condensed matter physics (Print)
(literal)

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S.V. Dordevic1, D.N. Basov1, R.C. Dynes1, B. Ruzicka2, V. Vescoli2, L. Degiorgi2,a, H. Berger3, R. Gaal3, L. Forro3, and E. Bucher4 (literal)

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1 Department of Physics, University of California, San Diego, La Jolla CA 92093, USA 2 Laboratorium fur Festkorperphysik, ETH Zurich, 8093 Zurich, Switzerland 3 Institute of Physics of Complex Matter, EPF Lausanne, 1015 Lausanne, Switzerland 4 Lucent Technologies, Murray Hill, NJ 07974, USA and Fakultat fur Physik, Universitat Konstanz, 78457 Konstanz, Germany (literal)

Titolo

Optical properties of the quasi-two-dimensional dichalcogenides 2H-TaSe2 and 2H-NbSe2 (literal)

Abstract

We present a comprehensive analysis of the optical constants of the two-dimensional dichalcogenide materials 2H-TaSe2 and 2H-NbSe2, in an attempt to address the physics of two-dimensional correlated systems. The title compounds were studied over several decades in frequency, from the far-infrared to the ultraviolet. Measurements with linearly polarized light have allowed us to obtain both the in-plane and out-of-plane components of the conductivity tensor. Although the electromagnetic response of dichalcogenides is strongly anisotropic, both the in-plane and out-of-plane components of the conductivity tensor share many common features, including the presence of a well-defined metallic component, as well as a \"mid-infrared band\". We discuss the implications of these results in the context of the spectroscopic results of other classes of low-dimensional conductors such as the high-temperature superconducting cuprates. In particular, the analysis of the redistribution of the spectral weight as a function of temperature, as well as the behavior of the quasiparticles relaxation rate, points to significant distinctions between the charge dynamics of dichalcogenides and other classes of low dimensional conductors. (literal)

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