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Related Experiment Video

Updated: Aug 6, 2025

Analysis of Contact Interfaces for Single GaN Nanowire Devices

Analysis of Contact Interfaces for Single GaN Nanowire Devices

Published on: November 15, 2013

Atomically Sharp Internal Interface in a Chiral Weyl Semimetal Nanowire.

Nitish Mathur^1,2, Fang Yuan¹, Guangming Cheng³

¹Department of Chemistry, Princeton University, Princeton, New Jersey 08544, United States.

|March 15, 2023

Summary

This summary is machine-generated.

Researchers explored internal interfaces in Weyl semimetals using merohedral twin boundaries in cobalt silicide nanowires. They discovered localized topological states at these internal interfaces, distinct from external ones.

Keywords:

CoSi nanowires Fermi arcs chiral Weyl semimetals merohedral twinning scanning transmission electron microscopy

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Area of Science:

Condensed Matter Physics
Materials Science
Topological Materials

Background:

Weyl semimetals (WSMs) exhibit unique topological properties at interfaces.
Investigating internal interfaces in WSMs is challenging due to difficulties in creating sharp, oriented interfaces.
Merohedral twin boundaries offer a unique platform for studying internal WSM interfaces.

Purpose of the Study:

To investigate the topological properties of merohedral twin boundaries in cobalt silicide (CoSi), a chiral Weyl semimetal.
To experimentally realize and characterize atomically sharp internal interfaces in WSMs.
To explore the potential of these interfaces for hosting novel topological states.

Main Methods:

Synthesis of single-crystal CoSi nanowires (NWs) with merohedral twin boundaries.
High-resolution scanning transmission electron microscopy (STEM) for interface characterization.
First-principles (ab initio) calculations to determine electronic band structure and surface states.

Main Results:

Atomically sharp (001) twin planes were observed in CoSi NWs, acting as inversion twin boundaries.
Localized internal Fermi arcs were theoretically predicted at the (001) twin plane.
These internal Fermi arcs are distinct from external Fermi arcs and bulk electronic states.

Conclusions:

Merohedrally twinned CoSi NWs provide an ideal system for studying topological states at internal interfaces.
The discovered internal Fermi arcs offer new avenues for exploring topological physics in WSMs.
This work demonstrates a pathway for experimentally accessing and investigating buried topological states in materials.