Gapless symmetry-protected topological phase of quantum antiferromagnets on anisotropic triangular strip

Yuichiro Hidaka, Shunsuke C. Furuya, Atsushi Ueda +1

We study a three-leg spin-1/2 ladder with geometrically frustrated interleg interactions. We call this model an anisotropic triangular-strip (ATS) model. We numerically and field-t…