DOS of Metallic CNTs - Exploring Equations & References

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In summary, the question being discussed is about the density of states (DOS) of metallic carbon nanotubes (CNTs). The original thread provided a DOS for metallic CNTs, but the equation given did not seem to result in a nonzero DOS at E=0, which is observed in metallic CNTs. The conversation suggests that this equation may not be accurate, and a different equation or reference is needed to accurately calculate the DOS of metallic CNTs. The concept of Fermi energy is also mentioned as a factor in determining the DOS of metallic CNTs.
  • #1
carbon9
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Hi all,

Sorry for starting a new thread that is similar to another previous one but the question I'll ask is different in fact.

Please consider the DOS of a metallic CNT given in this thread: https://www.physicsforums.com/showthread.php?t=351722

On the other hand, the DOS of 1-D structures are given as

http://img5.imageshack.us/img5/5562/adszvkj.jpg

However, it seems not possible to achieve a nonzero DOS at E=0 with this equation (the DOS of metallic CNTs are nonzero at E=0). So, I conclude that the DOS of metallic CNTs are different than this equation. Could you please give an equation for the DOS of metallic CNTs or a reference showing it?

Thank you in advance,
carbon9
 
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  • #2
Carbon9

E=0 is a reference. The fermi energy could be set to anything. A more correct statement would be that
a metallic CNT must have density of states at its fermi energy.So I'd say, your conclusion may not be true.

Try to find how the author above thinks about the Fermi energy when he writes that DOS.
 
  • #3
Thank you Sokrates. I'll look deeper and post here if I can get it.

Regards,
carbon9
 

1. What is DOS of Metallic CNTs?

The DOS (Density of States) of Metallic CNTs (Carbon Nanotubes) refers to the distribution of energy states for electrons within the metallic CNT structure. It is an important parameter for understanding the electronic properties and behavior of metallic CNTs.

2. How is the DOS of Metallic CNTs calculated?

The DOS of Metallic CNTs can be calculated using equations such as the Tight-Binding Model or the Density Functional Theory. These equations take into account factors such as the atomic structure and bonding within the CNT to determine the energy states of the electrons.

3. What factors affect the DOS of Metallic CNTs?

The DOS of Metallic CNTs can be influenced by various factors, including the diameter and chirality of the CNT, the number of layers, and the presence of defects or impurities. The electronic properties of the metal used to create the CNT can also impact the DOS.

4. Why is understanding the DOS of Metallic CNTs important?

Understanding the DOS of Metallic CNTs is crucial for designing and optimizing their electronic properties for various applications, such as in nanoelectronics, energy storage devices, and sensors. It also provides insights into the behavior of electrons within the CNT structure.

5. What are some references for further exploration of DOS of Metallic CNTs?

Some references for further exploration of DOS of Metallic CNTs include scientific journals and articles, such as "Electronic Structure and Density of States of Metallic Carbon Nanotubes" by E. R. Mucciolo and C. H. Lewenkopf, and "Density of States and Electronic Transport in Metallic Carbon Nanotubes" by D. M. Cardamone and S. Bandow. Online databases, conferences, and textbooks on nanoscience and nanotechnology also provide valuable information on this topic.

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