Figure 2 | Scientific Reports

Figure 2

From: A study of quantum Berezinskii–Kosterlitz–Thouless transition for parity-time symmetric quantum criticality

Figure 2

These figures show the behaviour of renormalization group flow lines for the couplings \(g_r\) and \(g_i\), for the initial value of \(K (=2)\). The left and right figures are for the third order (Eq. 5) and second order (Eq. 4) RG equations solutions. We mark the regions of RG flow lines into two region, I and II. The region I and II are the PT symmetry preserve and broken phases respectively. Magenta colour with arrow is the line of separatrix between the PT symmetry and PT symmetry broken phase. The BKT and PT phase boundaries coincide at \(K=2\).

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