Composite Edges of Composite Fermions

TKM Institutsseminar


Mykhailo Yutushui


30/11/2023 14:00


10.01, Geb. 30.23, CS; and Zoom


Weizmann Institute of Science


Alexander Mirlin


Non-Abelian quantum Hall phases have cultivated tremendous theoretical and experimental efforts for over three decades. The most promising candidate for such a phase occurs at ν=5/2 Hall plateau in GaAs and has been studied extensively by various experimental techniques, including shot noise and thermal conductance measurements. Recent experimental advances have facilitated the creation of high-quality interfaces between distinct quantum Hall phases. This technique permits stripping off ``unnecessary" edge modes and revealing universal features of bulk and edge.

In this talk, I will focus on composite fermion states and their edge structures. By adopting the composite fermion framework, the analysis of many interfaces becomes straightforward. I will explain how any non-Abelian paired composite fermion state can be identified by its noise signatures at interfaces with Abelian states. Crucially, this probe does not rely on particle-hole symmetry and can be used for paired composite fermion phases in Graphene and GaAs at even-denominator fillings beyond ν=1/2. I will demonstrate how interfaces with Abelian phases allow distinguishing various non-Abelian topological orders proposed for the ν=12/5 plateau.