Row coupling in an interacting quasi-one-dimensional quantum wire investigated using transport measurements

TL;DR

This paper investigates electron transport in weakly confined quasi-one-dimensional quantum wires, revealing evidence of inter-row coupling and bonding-antibonding states through conductance measurements, especially under high bias conditions.

Contribution

It provides experimental evidence of finite coupling between two electron rows in quantum wires, highlighting the formation of bonding and antibonding states under specific transport conditions.

Findings

Observation of conductance structures at 0.5(2e^2/h) and 0.25(2e^2/h) indicating inter-row coupling

Detection of bonding and antibonding states due to Coulomb interaction

Evidence of bifurcation of the electronic system into two coupled rows

Abstract

We study electron transport in quasi-one-dimensional wires at relatively weak electrostatic confinements, where the Coulomb interaction distorts the ground state, leading to the bifurcation of the electronic system into two rows. Evidence of finite coupling between the rows, resulting in bonding and antibonding states, is observed. At high dc source-drain bias, a structure is observed at 0.5(2e^2/h) due to parallel double-row transport, along with a structure at 0.25(2e^2/h), providing further evidence of coupling between the two rows.