ISSN:
1434-6036
Keywords:
PACS. 78.20.-e Optical properties of bulk materials and thin films – 71.45.Lr Charge-density-wave systems – 74.25.Gz Optical properties
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
Abstract: We present a comprehensive analysis of the optical constants of the two-dimensional dichalcogenide materials 2 H - TaSe 2 and 2 H - NbSe 2 , 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.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1140/epjb/e2003-00136-1
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