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MOS Capacitor

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A Metal-Oxide-Semiconductor (MOS) capacitor is a fundamental structure used extensively in semiconductor device technology, particularly in the fabrication of integrated circuits and MOSFETs (metal-oxide-semiconductor field-effect transistors). The MOS capacitor consists of three layers: a metal gate, a dielectric oxide, and a semiconductor substrate.
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Ultrahigh Density Array of Vertically Aligned Small-molecular Organic Nanowires on Arbitrary Substrates

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Pseudo-SAMOs array in positively charged semiconductor single-walled carbon nanotubes.

Sergei Alekseyevich Votyakov^1,2, Alexander Valentinovich Osadchy^1,2, Elena D Obraztsova¹

¹Prokhorov General Physics Institute of the Russian Academy of Sciences, Vavilov str. 38, 119991 Moscow, Russia.

|September 18, 2025

Summary

Researchers demonstrate novel high-energy pseudo-Super Atom Molecular Orbitals (SAMOs) in charged single-walled carbon nanotubes (SWCNTs). These pseudo-SAMOs exhibit unique quantization and longer lifetimes, advancing understanding of electronic states in nanotubes.

Keywords:

DFT SAMO electronic states lifetime nanotubes

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Published on: January 19, 2018

Area of Science:

* Condensed matter physics
* Nanomaterials science
* Quantum chemistry

Background:

* Super Atom Molecular Orbitals (SAMOs) are known electronic excited states in fullerenes.
* Previous theoretical work suggested similar states in single-walled carbon nanotubes (SWCNTs).
* SAMOs in fullerenes are classified by localization (s, p, d-SAMOs).

Purpose of the Study:

* To demonstrate the existence of pseudo-SAMOs in SWCNTs.
* To investigate high-energy pseudo-SAMOs under positive charging.
* To characterize the quantum properties and lifetimes of these states in finite SWCNTs.

Main Methods:

* Theoretical demonstration of pseudo-SAMO states.
* Analysis of electronic states under varying positive charge conditions.
* Investigation of quantum number relationships and state quantization along the z-axis.
* Estimation of pseudo-SAMO lifetimes in finite SWCNTs.

Main Results:

* Existence of pseudo-SAMOs with maxima at the center of SWCNTs is confirmed.
* High-energy pseudo-SAMOs appear with increasing positive charge on the SWCNT.
* Quantization along the z-axis is observed in finite SWCNTs, introducing a pseudo-z quantum number.
* Pseudo-SAMO lifetimes are 1-2 orders of magnitude longer than surface states, around 10^-8 s.

Conclusions:

* Pseudo-SAMOs represent a new class of electronic excited states in SWCNTs.
* The properties of pseudo-SAMOs are influenced by the nanotube's charge and geometry.
* These findings open new avenues for understanding and potentially utilizing electronic states in carbon nanotubes.