Compositional superlattices based on PtCl/PtBr MX materials
We consider theoretically a novel class of compositional superlattices consisting of alternating layers of quasi-one-dimensional (QlD) MX (halogen-bridged, transition metal) chain materials. In particular, we have studied a superlattice based on the PtCl/PtBr unit where the Peierls band gap for PtCl is {approximately}2.4 eV and {approximately}1.5 eV for PtBr. We have calculated electronic properties, optical absorption and vibrational properties (e.g. Raman spectrum) of an MX superlattice using a discrete, two-band, tight-binding Peierls-Hubbard model. The electronic band structure reveals a typical subband structure and varies with the relative lengths of the constituent PtCl and PtBr units. The MX superlattice can be thought of as an analog of a GaAs/GaAl{sub x}As{sub 1-x} compositional superlattice but with the added feature that the optical, transport and various other physical properties are modified due to presence of nonlinear excitations (e.g. polarons) in the doped samples.
- Research Organization:
- Los Alamos National Lab., NM (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- W-7405-ENG-36
- OSTI ID:
- 10107986
- Report Number(s):
- LA-UR--92-3249; CONF-9208132--8; ON: DE93003700
- Country of Publication:
- United States
- Language:
- English
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