Non-local Transport Spectroscopy of Symmetry-Broken Phases in Bilayer Graphene

Non-local Transport Spectroscopy of Symmetry-Broken Phases in Bilayer Graphene Abstract: Interaction-driven phases in Bernal bilayer graphene provide a platform where correlated states can be tuned using electric fields alone. Understanding the resulting phase diagram is the focus of intense theoretical and experimental effort. However, directly comparing theory and experiment remains challenging, as existing probes of valley symmetry breaking rely on local microscopy techniques that are incompatible with double-gated device geometries.

Here, we propose a non-local tunnel spectroscopy approach to distinguish symmetry-broken phases using transport measurements alone. An interacting region is coupled to external quantum dots that act as symmetry- selective probes. The interacting region is treated self- consistently using Hartree–Fock theory and embedded into a transport setup. We demonstrate how the mean-field order parameters can be recovered directly from transport signatures.