Any small disorder turns a clean Weyl nodal loop semimetal into a multifractal semimetal, and at a critical disorder there is a transition to a diffusive metal with exponents nu=1.0 and z=1.9.
Basis-Independent Spectral Methods for Non-linear Optical Response in Arbitrary Tight-binding Models
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abstract
In this paper, we developed a basis-independent perturbative method for calculating the non-linear optical response of arbitrary non-interacting tight-binding models. Our method is based on the non-equilibrium Keldysh formalism and allows an efficient numerical implementation within the framework of the Kernel Polynomial Method for systems which are not required to be translation-invariant. Some proof-of-concept results of the second-order optical conductivity are presented for the special case of gapped graphene with vacancies and an on-site Anderson disordered potential.
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cond-mat.dis-nn 1years
2019 1verdicts
CONDITIONAL 1representative citing papers
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Disorder driven multifractality transition in Weyl nodal loops
Any small disorder turns a clean Weyl nodal loop semimetal into a multifractal semimetal, and at a critical disorder there is a transition to a diffusive metal with exponents nu=1.0 and z=1.9.