# Almost linear Haldane pseudopotentials and emergent conformal block wave-functions in a Landau level

## TL;DR

This paper demonstrates that certain conformal block wave-functions, including Laughlin and Moore-Read states, can be exact eigenstates or ground states in a Landau level with a specific linearly decreasing Haldane pseudopotential and external potentials, revealing how these states emerge.

## Contribution

It shows that conformal block wave-functions are exact eigenstates in a Landau level with a linear Haldane pseudopotential and external potentials, providing new insights into their emergence.

## Key findings

- Conformal blocks span the ground state subspace of the model.
- Moore-Read conformal blocks remain exact eigenstates in the thermodynamic limit.
- Tuning external potentials can enforce Moore-Read states as exact ground states.

## Abstract

We consider a two dimensional (2D) model of particles interacting in a Landau level. We work in a finite disk geometry and take the particles to interact with a linearly decreasing two-body Haldane pseudo-potential. We show that the ground state subspace of this model is spanned by the wave-functions that can be written as polynomial conformal blocks (of an arbitrary conformal field theory) consistent with the filling fraction (scaling dimension). To remove degeneracies, we then add a quadratic perturbation to the Hamiltonian and show that; 1. Conformal blocks constructed using the Moore-Read construction (e.g. Laughlin, Pfaffian, and Read-Rezayi states) remain exact eigenstates of this model in the thermodynamic limit and 2. By tuning an externally imposed single-body $-L_z^2$ potential we can enforce Moore-Read conformal blocks to become exact ground states of this model in the thermodynamic limit. We cannot rule out the possibility of residual degeneracies in this limit. This model has no filling dependence and is comprised only from two-body long-range interactions and external single-body potentials. Our results provide insight into how conformal block wave-functions can emerge in a Landau level.