English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

A wide variety of two-dimensional electron systems (2DES) allow forindependent control of the total and relative charge density of two-componentfractional quantum Hall (FQH) states. In particular, a recent experiment onbilayer graphene (BLG) observed a continuous transition between a compressibleand incompressible phase at total filling $\nu_T = \frac{1}{2}$ as charge istransferred between the layers, with the remarkable property that theincompressible phase has a finite interlayer polarizability. We argue that thisoccurs because the topological order of $\nu_T = \frac{1}{2}$ systems supportsa novel type of interlayer exciton that carries Fermi statistics. If thefermionic excitons are lower in energy than the conventional bosonic excitons(i.e., electron-hole pairs), they can form an emergent neutral Fermi surface,providing a possible explanation of an incompressible yet polarizable state at$\nu_T = \frac{1}{2}$. We perform exact diagonalization studies whichdemonstrate that fermionic excitons are indeed lower in energy than bosonicexcitons. This suggests that a "topological exciton metal" hidden inside a FQHinsulator may have been realized experimentally in BLG. We discuss severaldetection schemes by which the topological exciton metal can be experimentallyprobed.

Topological exciton Fermi surfaces in two-component fractional quantized Hall insulators