Dresden 2026 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 83: Topology: Quantum Hall Systems

TT 83.8: Talk

Thursday, March 12, 2026, 17:00–17:15, HSZ/0105

Hollow Topological Matter and Dual Fractional Quantum Hall Effect — •Ram Mummadavarapu and Roman-Pascal Riwar — Peter Gruenberg Institute, Theoretical Nanoelectronics, Forschungszentrum Juelich, D-52425 Juelich, Germany

The Integer Quantum Hall Effect (IQHE) at filling factor m and the Fractional Quantum Hall Effect (FQHE) at 1/m are commonly viewed as distinct phases of matter. We propose various chiral/non-chiral heterostructures that effectively pin m co-propagating IQHE edge states to a synchronised single mode. This setup thus realizes the Dual Fractional Quantum Hall Effect (DFQHE), a phase where fractionalization is reversed, that is, fundamental excitations retain integer electric charge but carry fractional magnetic flux. While the transconductance remains integer quantized, the edge correlations nonetheless exhibit anyonic power-law scaling. We show that this is a physical manifestation of Hollow Topological Matter: due to pinning, the edge no longer corresponds to the original physical bulk, but rather to a virtual bulk that may be bosonic or fermionic independent of the microscopic exchange statistics.

Keywords: Topological Order; Duality; Edge States; Fractional Quantum Hall Effect; Chiral