Table 1 Symmetry operations and corresponding nonvanishing elements of third-rank tensor\(\,\beta\) in the bulk and surface of Ag2Te

From: Surface photogalvanic effect in Ag2Te

 

Bulk

Surface (//b)

Symmetry operations

\(\widetilde{{M}_{b}}\)

√

×

\({C}_{2b}\)

√

√

\(I\)

√

×

Space group

P21/c

P21

Nonvanishing elements of \(\beta\)

none

\({\beta }_{y{xx}}\),\(\,{\beta }_{{yyy}}\),\(\,{\beta }_{{xxy}}\)

  1. Note that only elements leading to in-plane photocurrent with normal incidence are listed here. The subscripts x, y, and z are Cartesian coordinates indicated in Fig. 1a where y direction is parallel to the crystallographic b-axis.
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