Pure Spin Bulk Photovoltaic Effect in an Altermagnetic Higher-Order Topological Insulator

Sibgat Ulah, Ankan Bhattacharyya, Manisha Thakurathi

We investigate the bulk photovoltaic effect (BPVE) in a $PT$-symmetric two-dimensional heterostructure consisting of a topological insulator coupled to a $d$-wave altermagnet. To d…