V. The tight-binding approximation of the shift current: justification and pitfalls 11 A. Nature of the approximation 11 B. Semi-empirical justification of the approximation 11 C. Rigorous justification of the approximation 11 D. The discrete-space approximation for two bands 11 VI. Discussion and outlook 12 A. Recapitulation and fresh motivation of results 12 B. Outlook for high-throughput materials search 13 Acknowledgments 13 References 13
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