Topological field-effect quantum transistors in HgTe nanoribbons

Area of Science:

• Condensed Matter Physics
• Materials Science
• Nanoelectronics

Background:

• Topological materials offer unique quantum properties.
• Field-effect transistors are fundamental to modern electronics.
• HgTe nanoribbons with inverted band structures are promising platforms.

Purpose of the Study:

• To propose practical designs for topological field-effect quantum transistors.
• To investigate the behavior of conductance channels in HgTe nanoribbons under gate voltage.
• To explore the topological characteristics and controllability of these channels.

Main Methods:

• Theoretical calculations of HgTe nanoribbon devices.
• Analysis of conductance quantization under applied gate voltage.
• Investigation of robustness against disorder and coupling with edge states.

Main Results:

• Two new gate-induced conductance channels form in HgTe nanoribbons.
• These channels exhibit quantized conductance of 2e(2)/h and topological characteristics.
• The channels are robust against disorder and can be controlled by gate voltage.

Conclusions:

• Controllable topological edge states can be realized in HgTe nanoribbons using field-effect gating.
• This work opens new avenues for topological field-effect quantum transistors.
• The findings have implications for future nanoelectronics and spintronics applications.