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.
Similar content being viewed by others
Author information
Authors and Affiliations
Additional information
Received 28 October 2002 / Received in final form 10 March 2003 Published online 23 May 2003
RID="a"
ID="a"e-mail: degiorgi@solid.phys.ethz.ch
Rights and permissions
About this article
Cite this article
Dordevic, S., Basov, D., Dynes, R. et al. Optical properties of the quasi-two-dimensional dichalcogenides 2H-TaSe and 2H-NbSe . Eur. Phys. J. B 33, 15–23 (2003). https://doi.org/10.1140/epjb/e2003-00136-1
Issue Date:
DOI: https://doi.org/10.1140/epjb/e2003-00136-1