# Strongly Interacting Phases of Metallic Wires in Strong Magnetic Field

## TL;DR

This paper theoretically explores a new one-dimensional metallic system under strong magnetic fields, revealing complex phase behavior and topological distinctions depending on the number of Landau level degeneracies.

## Contribution

It maps a high Landau level problem to multi-component fermions and characterizes the phase diagram using renormalization group and bosonization techniques.

## Key findings

- Identification of pseudospin-charge separation with a gapless charge sector.
- Discovery of topologically distinct phases for odd N.
- Existence of a novel pseudospin-gapless phase for even N > 2.

## Abstract

We investigate theoretically an interacting metallic wire with a strong magnetic field directed along its length and show that it is a new and highly tunable one-dimensional system. By considering a suitable change in spatial geometry, we map the problem in the zeroth Landau level with Landau level degeneracy $N$ to one-dimensional fermions with an $N$-component pseudospin degree of freedom and $SU(2)$-symmetric interactions. This mapping allows us to establish the phase diagram as a function of the interactions for small $N$ (and make conjectures for large $N$) using renormalization group and bosonization techniques. We find pseudospin-charge separation with a gapless $U(1)$ charge sector and several possible strong-coupling phases in the pseudospin sector. For odd $N$, we find a fluctuating pseudospin-singlet charge density wave phase and a fluctuating pseudospin-singlet superconducting phase which are topologically distinct. For even $N>2$, similar phases exist, although they are not topologically distinct, and an additional, novel pseudospin-gapless phase appears. We discuss experimental conditions for observing our proposals.