Fig. 4: Shift current conductivity and the k-space distribution of the related quantities in monolayer GeS. | npj Quantum Materials

Fig. 4: Shift current conductivity and the k-space distribution of the related quantities in monolayer GeS.

From: Generalized Wilson loop method for nonlinear light-matter interaction

Fig. 4

a Shift current conductivity \(\sigma ^{yyy}\left( \omega \right)\) calculated by the Wilson loop approach with two bands across the gap. Rcv denotes the original shift vector formula and q, 2q, −q represent the formula using the imaginary part of Wilson loop \(W_{mn}\left( {{{{\boldsymbol{k}}}},{{{\boldsymbol{q}}}},{{{\boldsymbol{r}}}},{{{\boldsymbol{r}}}}} \right)\) with different q values. b k-resolved absorption strength \(r_{cv}^yr_{vc}^y\) corresponding to quantum metric \(g_{cv}^{yy}\) in the first Brillouin zone. c, d k-resolved shift current strength \(I_{vc}^{y,y}\left( {{{{\boldsymbol{k}}}},\omega } \right)\) at \(\omega = 2.0\) and \(\omega = 2.8\) eV using the Wilson loop approach, respectively.

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