Figure 2

The currents of heat Q̇ (black curves) and work Ẇ (red curves) as a function of \(J_{s}^{x}/J_{s}^{y}\) for different proportions \(P_{D}\) of the dark state, i.e., \(P_{D}=0\) (solid curve), \(P_{D}=0.3\) (dashed curve), \(P_{D}=0.6\) (dotted curve) and \(P_{D}=0.9\) (dash-dotted curve). The other parameters are set as \(\omega _{S_{1}}=\omega _{S_{2}}=\omega _{R}=3\), \(J_{1}=J_{2}=1.2\) and \(T_{R}=1\)