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Seedless Growth of Bismuth Nanowire Array via Vacuum Thermal Evaporation

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Published on: December 21, 2015

Robust surface state transport in thin bismuth nanoribbons.

Wei Ning¹, Fengyu Kong¹, Yuyan Han¹

¹High Magnetic Field Laboratory, Chinese Academy of Sciences, Hefei 230031, Anhui, P. R. China.

Scientific Reports

|November 19, 2014

Summary

Experimental evidence for 2D quantum transport in bismuth nanoribbons confirms the existence of robust, topologically protected 2D metallic surface states. These findings are crucial for understanding nanoscale bismuth properties.

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Area of Science:

Condensed Matter Physics
Materials Science
Nanotechnology

Background:

A two-dimensional (2D) metallic surface state in bismuth (Bi) has been theorized, but experimental proof of 2D quantum transport is lacking.
Understanding the quantum transport properties of nanoscale materials is essential for developing novel electronic devices.

Purpose of the Study:

To provide experimental evidence for 2D quantum transport in bismuth nanoribbons.
To investigate the nature and robustness of 2D metallic surface states in bismuth nanoribbons.

Main Methods:

Angular-dependent magnetoresistance measurements were performed on single-crystal Bi nanoribbons.
Analysis of low-field weak antilocalization and high-field Shubnikov-de Haas (SdH) oscillations.

Main Results:

Both weak antilocalization and Shubnikov-de Haas oscillations exhibited 2D characteristics, confirming 2D metallic surface states.
The 2D metallic surface states were found to be robust against oxidation upon exposure to ambient conditions.
Carrier density in the surface states was modified after oxidation, but the 2D transport remained dominant.

Conclusions:

The observed 2D quantum transport in Bi nanoribbons provides strong evidence for the existence of 2D metallic surface states.
These surface states are likely topologically protected, contributing to their robustness.
The findings offer critical insights into the surface properties of bismuth at the nanoscale.