Update pub.bib (#204)

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+@Article{Jin_JPhysCondensMatterInstPhysJ_2021_v33_p325503,
+    author =   {Gan Jin and Daye Zheng and Lixin He},
+    title =    {{Calculation of Berry curvature using non-orthogonal atomic orbitals}},
+    journal =  {J. Phys., Condens. Matter: Inst. Phys. J.},
+    year =     2021,
+    volume =   33,
+    number =   32,
+    pages =    325503,
+    doi =      {10.1088/1361-648X/ac05e5},
+    abstract = {We present a derivation of the full formula to calculate the Berry
+             curvature on non-orthogonal numerical atomic orbital (NAO) bases.
+             Because usually, the number of NAOs is larger than that of the Wannier
+             bases, we use a orbital contraction method to reduce the basis sizes,
+             which can greatly improve the calculation efficiency without
+             significantly reducing the calculation accuracy. We benchmark the
+             formula by calculating the Berry curvature of ferroelectric BaTiO3and
+             bcc Fe, as well as the anomalous Hall conductivity for Fe. The results
+             are in excellent agreement with the finite-difference and previous
+             results in the literature. We find that there are corrections terms to
+             the Kubo formula of the Berry curvature. For the full NAO base, the
+             differences between the two methods are negligibly small, but for the
+             reduced bases sets, the correction terms become larger, which may not
+             be neglected in some cases. The formula developed in this work can
+             readily be applied to the non-orthogonal generalized Wannier
+             functions.},
+}
+
 @Article{Chen_PhysRevB_2009_v80_p165121,
     author =   {Mohan Chen and Wei Fang and G.-Z. Sun and G.-C. Guo and Lixin He},
     title =    {{Method to construct transferable minimal basis sets forab