Figure 2
From: Role of Majorana fermions in high-harmonic generation from Kitaev chain
High-harmonic spectrum as a function of \(\mu /t_{0}\) with different boundary conditions. High-harmonic spectra on the two side of the phase transition of the 1D superconducting Kitaev chain. The spectra for (a) the topological phase at \(\mu /t_{0} = 1.8\), and (b) the trivial phase at \(\mu /t_{0} = 2.2\) when the open boundary condition (OBC) is used. The spectra (c) and (d) are same as (a) and (b), respectively, with periodic boundary condition (PBC) imposed on the Kitaev chain. \(L = 128\) is used while simulating the harmonic spectra. A linearly polarised laser pulse with a peak amplitude of 30 MV/m and 9.1 \(\upmu\)m wavelength having ten optical cycles with sine squared envelope is used to obtain the spectrum.
