Quantum Confined Tomonaga-Luttinger Liquid in MoSe2 Twin Domain Boundaries

TL;DR

This study uses low-temperature scanning tunneling spectroscopy to investigate twin domain boundaries in MoSe2 monolayers, revealing quantum confinement effects and signatures of Tomonaga-Luttinger liquid behavior, while ruling out charge density waves at low temperatures.

Contribution

It provides direct experimental evidence of TLL behavior in MoSe2 domain boundaries, clarifying conflicting reports and demonstrating quantum confinement effects.

Findings

Evidence of quantum well states in MoSe2 DBs

Signatures of Tomonaga-Luttinger liquid behavior

Absence of charge density wave at low temperatures

Abstract

There have been conflicting reports on the electronic properties of twin domain boundaries (DBs) in MoSe2 monolayer, including the quantum well states, charge density wave, and Tomonaga-Luttinger liquid (TLL). Here we employ low-temperature scanning tunneling spectroscopy to reveal both the quantum confinement effect and signatures of TLL in the one-dimensional DBs. The data do not support the CDW at temperatures down to ~5 K.