P Turchi et al 1982 J. Phys. C: Solid State Phys. 15 2891 doi:10.1088/0022-3719/15/13/017
Band gaps and asymptotic behaviour of continued fraction coefficients
P Turchi, F Ducastelle and G Treglia
Show affiliationsContinued fractions are frequently used to approximate densities of states. When the support of these densities is connected (i.e. there is no gap) the coefficients (an, bn2) of the continued fraction converge when n to infinity . In the presence of gaps, they exhibit undamped oscillations. The authors characterise these oscillations completely by studying the spectrum of periodic linear chains. It is found that the coefficients are periodic abelian functions of n (elliptic functions in the case of a single gap), in agreement with recent results by Magnus (1979). The corresponding recurrence laws are derived, and methods for terminating the continued fraction are given. The case of a single gap is treated in detail, and numerous examples and applications are provided.
- PACS
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71.15.-m Methods of electronic structure calculations
73.20.At Surface states, band structure, electron density of states
- Subjects
- Dates
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Issue 13 (10 May 1982)
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Band gaps and asymptotic behaviour of continued fraction coefficients
P Turchi et al 1982 J. Phys. C: Solid State Phys. 15 2891
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