Partons as unique ground states of quantum Hall parent Hamiltonians: The case of Fibonacci anyons

TL;DR

This paper constructs microscopic parent Hamiltonians for quantum Hall states with parton-like ground states, revealing their topological properties, excitations, and connections to Fibonacci anyons and tensor networks.

Contribution

It introduces new frustration-free Hamiltonians for quantum Hall fluids with parton-like ground states and characterizes their topological and entanglement properties.

Findings

Ground states are parton-like with Abelian or non-Abelian braiding statistics.

Elementary excitations are Fibonacci anyons.

Zero mode counting relates to patterns consistent with the Entangled Pauli Principle.

Abstract

We present microscopic, multiple Landau level, (frustration-free and positive semi-definite) parent Hamiltonians whose ground states, realizing different quantum Hall fluids, are parton-like and whose excitations display either Abelian or non-Abelian braiding statistics. We prove ground state energy monotonicity theorems for systems with different particle numbers in multiple Landau levels, demonstrate S-duality in the case of toroidal geometry, and establish complete sets of zero modes of special Hamiltonians stabilizing parton-like states. The emergent Entangled Pauli Principle (EPP), introduced in Phys. Rev. B 98, 161118(R) (2018) and which defines the ``DNA'' of the quantum Hall fluid, is behind the exact determination of the topological characteristics of the fluid, including charge and braiding statistics of excitations, and effective edge theory descriptions. When the closed-shell condition is satisfied, the densest (i.e., the highest density and lowest total angular momentum) zero-energy mode is a unique parton state. We conjecture that parton-like states generally span the subspace of many-body wave functions with the two-body $M$-clustering property within any given number of Landau levels. General arguments are supplemented by rigorous considerations for the $M=3$ case of fermions in four Landau levels. For this case, we establish that the zero mode counting can be done by enumerating certain patterns consistent with an underlying EPP. We apply the coherent state approach to show that the elementary (localized) bulk excitations are Fibonacci anyons. This demonstrates that the DNA associated with fractional quantum Hall states encodes all universal properties. Specifically, for parton-like states, we establish a link with tensor network structures of finite bond dimension that emerge via root level entanglement.