<html><body><div style="color:#000; background-color:#fff; font-family:times new roman, new york, times, serif;font-size:12pt"><div style="font-family: times new roman, new york, times, serif; font-size: 12pt;"><div style="font-family: times new roman, new york, times, serif; font-size: 12pt;"><div id="yiv1659106818"><div><div style="color:#000;background-color:#fff;font-family:times new roman, new york, times, serif;font-size:12pt;"><div dir="ltr">Hello</div><div dir="ltr">I am investigating structural and electronic properties of AgSbTe2.</div><div dir="ltr">AgSbTe2 is a narrow-gap semiconductor. But LDA calculations show that it is a semimetal and there is no gap in band structure. So that, I used LDA+u calculation but the band-gap problem was not solved and again there was no band gap.</div><div dir="ltr">In a paper, the problem was corrected by sx-LDA.</div><div dir="ltr">Can I use sx-LDA by quantum espresso? And if not, how can I correct band gap
problem using quantum espresso?</div><div dir="ltr">thank you<br></div></div></div></div><meta http-equiv="x-dns-prefetch-control" content="on"><br><br> </div> </div> </div></body></html>