Dimensionality and correlation effects in coupled carbon nanotube arrays

Area of Science:

• Condensed Matter Physics
• Materials Science
• Nanotechnology

Background:

• Coupled one-dimensional (1D) conductor arrays offer a platform for exploring higher-dimensional electronic correlation phenomena.
• Well-aligned semiconducting carbon nanotubes (CNTs) are promising for ultra-scaled transistors, but their tunable dimensionality and electron-electron (e-e) interactions require further investigation.
• Configuring coupled 1D architectures for studying electronic phases has been a long-standing challenge.

Purpose of the Study:

• To experimentally realize a dimensional transition with controlled electronic correlations in situ.
• To construct and investigate the phase diagram of a coupled 1D electron system.
• To explore low-dimensional electronic phase transitions and understand CNT array transport behavior.

Main Methods:

• Fabrication of coupled quantum wire arrays using well-aligned CNTs in a 2D film.
• Utilizing a high-efficiency top gate for tunable control of CNT arrays.
• Observing transport behaviors and gate-tunable e-e interactions.

Main Results:

• Successful extension of the Tomonaga-Luttinger liquid (LL) to a 2D system.
• Observation of gate-tunable e-e interaction with universal scaling behavior.
• Demonstration of transport behavior evolution from LL to Fermi liquid or Coulomb blockade regimes by varying e-e interaction and temperature.

Conclusions:

• An electronic phase diagram for dimensional transitions across three dimensionalities was obtained.
• Engineered artificial arrays of 1D wires provide opportunities to explore low-dimensional electronic phase transitions.
• This research deepens the understanding of CNT array transport behavior for electronics applications.