# Is 1T-TaS$_2$ a 40 year old quantum spin liquid?

## TL;DR

This paper reinterprets 1T-TaS$_2$, a well-known insulator, as a quantum spin liquid, suggesting it exhibits exotic magnetic states and proposing new experimental directions.

## Contribution

It presents a novel perspective that 1T-TaS$_2$ is a quantum spin liquid, challenging traditional views and highlighting its potential for hosting exotic quantum states.

## Key findings

- 1T-TaS$_2$ likely exhibits a $Z_2$ or Dirac spin liquid state.
- Doping could lead to emergent exotic states.
- Proposes specific experimental probes to verify the spin liquid nature.

## Abstract

1T-TaS$_2$ is unique among transition metal dichalcogenides in that it is understood to be a correlation driven insulator, where the unpaired electron in a 13 site cluster experiences enough correlation to form a Mott insulator. We argue based on existing data that this well-known material should be considered as a quantum spin liquid, either a fully gapped $Z2$ spin liquid or a Dirac spin liquid. We discuss the exotic states that emerge upon doping and propose further experimental probes.