Broken Symmetry States in Dual Gated Rhombohedral Trilayer Graphen

We perform low temperature transport measurements of dual-gated rhombohedral-stacked trilayer graphene device. At the charge neutral point, we observe a giant interaction-induced gap, $\sim$ 41mV that is suppressed by an interlayer potential or a critical temperature Tc $\sim$ 28K, suggesting a layer antiferromagnetic ground state with broken time reversal symmetry. In the quantum Hall regime, we observe~QH plateaus at filling factors $\nu =$0, 1, 2 and 3 in a high magnetic field.