A superconductor, when exposed to a spin-exchange field, can exhibit spatial modulation of its order parameter, commonly referred to as the Fulde–Ferrell–Larkin–Ovchinnikov state. Such a state can be induced by controlling the spin-splitting field in Josephson junction devices, allowing access to a wide range of the phase diagram. Here we demonstrate that a Fulde–Ferrell–Larkin–Ovchinnikov state can be induced in Josephson junctions based on the two-dimensional dilute magnetic topological insulator (Hg,Mn)Te. We do this by observing the dependence of the critical current on the magnetic field and temperature. The substitution of Mn dopants induces an enhanced Zeeman effect, which can be controlled with high precision by using a small external magnetic field. We observe multiple re-entrant behaviours of the critical current as a response to an in-plane magnetic field, which we assign to transitions between ground states with a phase shifted by π. This will enable the study of the Fulde–Ferrell–Larkin–Ovchinnikov state in much more accessible experimental conditions.

超导体当暴露于自旋交换场时，可以表现出其有序参数的空间调制，通常称为富尔德-费雷尔-拉金-奥夫钦尼科夫态。这种状态可以通过控制约瑟夫森结器件中的自旋分裂场来诱导，从而允许访问各种相图。在这里，我们证明了基于二维稀磁拓扑绝缘体 (Hg,Mn)Te，可以在约瑟夫森结中诱导 Fulde-Ferrell-Larkin-Ovchinnikov 态。我们通过观察临界电流对磁场和温度的依赖性来做到这一点。 Mn掺杂剂的替代会引起增强的塞曼效应，可以通过使用小的外部磁场来高精度控制。我们观察到临界电流的多个重入行为作为对面内磁场的响应，我们将其分配给相移 π 的基态之间的跃迁。这将使富尔德-费雷尔-拉金-奥夫钦尼科夫态的研究能够在更容易实现的实验条件下进行。