Elementary excitations in fractional quantum Hall effect from classical constraints

Classical constraints on the reduced density matrix of quantum fluids in a single Landau level termed as local exclusion conditions (LECs) (Yang 2019 Phys. Rev. B 100 241302), have recently been shown to characterize the ground state of many fractional quantum Hall (FQH) phases. In this work, we extend the LEC construction to build the elementary excitations, namely quasiholes and quasielectrons, of these FQH phases. In particular, we elucidate the quasihole counting, categorize various types of quasielectrons, and construct their microscopic wave functions. Our extensive numerical calculations indicate that the undressed quasielectron excitations of the Laughlin state obtained from LECs are topologically equivalent to those obtained from the composite fermion theory. Intriguingly, the LEC construction unveils interesting connections between different FQH phases and offers a novel perspective on exotic states such as the Gaffnian and the Fibonacci state.

Automated summary

The study extends local exclusion conditions (LECs) from the ground state to construct the elementary excitations of quasiholes and quasielectrons in fractional quantum Hall (FQH) phases. It is found that the undressed quasielectron excitations obtained from LECs are topologically equivalent to those from composite fermion theory, revealing interesting connections between different FQH phases.