Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Comment on "Ab initio calculation of the shift photocurrent by Wannier
  interpolation"   In a recent paper, Iba\~nez-Azpiroz et al. [Phys. Rev. B 97, 245143 (2018)]
derive a band-truncation-error-free formula for calculating the generalized
derivative of the interband dipole matrix using Wannier interpolation. In
practice, the denominators involving intermediate states are regularized by
introducing a finite broadening parameter. In this Comment, I show that when a
finite broadening parameter is used, a correction term must be added to the
generalized derivative to obtain results that are independent of the phase
convention for the Bloch sums.

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The categories of this paper are: q-bio
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The categories of this paper are: alg-geom
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The categories of this paper are: physics
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The categories of this paper are: nucl-th
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The categories of this paper are: atom-ph
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The categories of this paper are: gr-qc
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The categories of this paper are: patt-sol
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The categories of this paper are: hep-ph
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The categories of this paper are: chem-ph
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The categories of this paper are: nucl-ex
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The categories of this paper are: q-fin
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The categories of this paper are: supr-con
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The categories of this paper are: dg-ga
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The categories of this paper are: chao-dyn
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The categories of this paper are: nlin
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The categories of this paper are: math