Fig. 3 | npj Quantum Information

Fig. 3

From: An interaction-driven many-particle quantum heat engine and its universal behavior

Fig. 3

Performance across the phase diagram. a Efficiency \(\eta\) as a function of the density \(n\). b Average work output \(W/N\) as a function of density \(n\). c Phase diagram of a Bose gas given by a contour plot of the specific heat. The three different polygons delineate interaction-driven thermodynamic cycles in different regimes of the phase diagram corresponding to the three dashed lines in the other panels. The equilibrium states A and C are chosen with fixed \(c\) and \(T\) for the different cycles. The efficiency saturates at \(0.42\) given by Eq. 14 in the TLL regime. (d) The energy derivative \(\partial E/\partial c\) per particle as a function of the interaction strength \(c\). The areas of these three polygons correspond to the works per particle \(W/N\) for the three cycles in figure (c), respectively

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