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In condensed matter physics, the study of electronic states with SU(N)symmetry has attracted considerable and growing attention in recent years, assystems with such a symmetry can often have a spontaneous symmetry-breakingeffect giving rise to a novel ground state. For example, pseudospin quantumHall ferromagnet of broken SU(2) symmetry has been realized by bringing twoLandau levels close to degeneracy in a bilayer quantum Hall system. In the pastseveral years, the exploration of collective states in other multi-componentquantum Hall systems has emerged. Here we show the conventional pseudospinquantum Hall ferromagnetic states with broken SU(2) symmetry collapsed rapidlyinto an unexpected state with broken SU(4) symmetry, by in-plane magnetic fieldin a two-subband GaAs/AlGaAs two-dimensional electron system at filling factoraround $\nu=4$. Within a narrow tilting range angle of 0.5 degrees, theactivation energy increases as much as 12 K. While the origin of this puzzlingobservation remains to be exploited, we discuss the possibility of along-sought pairing state of electrons with a four-fold degeneracy.

Observation of an in-plane magnetic-field-driven phase transition in a quantum Hall system with SU(4) symmetry