Anisotropies in insulating La${}_{2-x}$Sr${}_x$CuO${}_4$: angular resolved photoemission and optical absorption

Abstract

Due to the orthorhombic distortion of the lattice, the electronic hopping integrals along the $a$ and $b$ diagonals, the orthorhombic directions, are slightly different. We calculate their difference in the LDA and find $t_a^{\prime }-t_b^{\prime }\approx 8$meV. We argue that electron correlations in the insulating phase of La${}_{2-x}$Sr${}_x$CuO${}_4$, i. e. at doping $x\le 0.055,$ dramatically enhance the $(t_a^{\prime }-t_b^{\prime })$-splitting between the $a$- and $b$-hole valleys. In particular, we predict that the intensity of both angle-resolved photoemission and of optical absorption is very different for the $a$ and $b$ nodal points.

References in corpus (2)

• Destruction of Neel order and local spin spirals in insulating La_{2-x}Sr_xCuO_4
• Theory of Anisotropic Hopping Transport due to Spiral Correlations in the Spin-Glass Phase of Underdoped Cuprates