  In van der Waals heterostructures (vdWHs), the manipulation of interlayer
stacking/coupling allows for the construction of customizable quantum systems
exhibiting exotic physics. An illustrative example is the diverse range of
states of matter achieved through varying the proximity coupling between
two-dimensional (2D) quantum spin liquid (QSL) and superconductors within the
TaS2 family. This study presents a demonstration of the intertwined physics of
spontaneous rotational symmetry breaking, hidden magnetism, and Ising
superconductivity in the three-fold rotationally symmetric, non-magnetic
natural vdWHs 6R-TaS2. A distinctive phase emerges in 6R-TaS2 below a
characteristic temperature (T*) of approximately 30 K, which is characterized
by a remarkable set of features, including a giant extrinsic anomalous Hall
effect (AHE), Kondo screening, magnetic field-tunable thermal hysteresis, and
nematic magneto-resistance. At lower temperatures, a coexistence of nematicity
and Kondo screening with Ising superconductivity is observed, providing
compelling evidence of hidden magnetism within a superconductor. This research
not only sheds light on unexpected emergent physics resulting from the coupling
of itinerant electrons and localized/correlated electrons in natural vdWHs but
also emphasizes the potential for tailoring exotic quantum states through the
manipulation of interlayer interactions.
