5 [17] In addition even and odd solutions with n > 0 have dif- ferent singular behavior at | ξ | ≪ 1: δρ (even) ∼ √ | ξ | , δρ (odd) ∼ sign( ξ ) / √ | ξ | . At ξ → ± 1 all solutions diverge as δρ ∼ 1 / √ 1 − ξ $^{2}$. [18] L.M. Zhang and M.M. Fogler, Phys. Rev. Lett. 100 , 116804 (2008). [19] I.L. Aleiner and L.I. Glazman, Phys. Rev. Lett. 72 , 2935 (1994). [20] V.A. Volkov and S. A. Mikhailov, JETP Lett. 42 , 556 (1985).