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Negative differential resistance and bias-modulated metal-to-insulator transition in zigzag C 2 N- h 2D nanoribbon

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ABSTRACT

Motivated by the fabrication of layered two-dimensional material C2N-h2D [Nat. Commun. 6, 6486 (2015)], we cut the single-layer C2N-h2D into a zigzag nanoribbon and perform a theoretical study. The results indicate that the band structure changes from semiconducting to metallic and a negative differential resistance effect occurs in the I-V curve. Interestingly, the current can be reduced to zero and this insulator-like state can be maintained as the bias increases. We find this unique property is originated from a peculiar band morphology, with only two subbands appearing around the Fermi level while others being far away. Furthermore the width and symmetry of the zigzag C2N-h2D nanoribbon can be used to tune the transport properties, such as cut-off bias and the maximum current. We also explore the electron transport property of an aperiodic model composed of two nanoribbons with different widths and obtain the same conclusion. This mechanism can be extended to other systems, e.g., hybrid BCN nanoribbons. Our discoveries suggest that the zigzag C2N-h2D nanoribbon has great potential in nanoelectronics applications.

No MeSH data available.


Related in: MedlinePlus

The transmission spectra of W = 1.5 zigzag C2N-h2D nanoribbon under bias Vb = 0.00, 0.05, 0.10, 0.15, 0.20 and 0.25 V.Zero energy is the Fermi level.
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f3: The transmission spectra of W = 1.5 zigzag C2N-h2D nanoribbon under bias Vb = 0.00, 0.05, 0.10, 0.15, 0.20 and 0.25 V.Zero energy is the Fermi level.

Mentions: In order to investigate the physical mechanism of the peculiar I-V characteristic of our models, we first calculate the transmission spectra of W = 1.5 model under different biases as shown in Fig. 3. It can be found that as the bias increases the intensity of the transmission peak around the Fermi energy gradually decreases. Owing to the increasing integration region, the current firstly increases under a low bias. When the bias is higher than 0.1 V, the current begins to drop, so a NDR effect occurs. When the bias continues to increase to 0.25 V, the current decreases to zero due to the disappeared transmission peak. It is quite interesting that the insulator-like state can be maintained until the bias increases to 1.0 V.


Negative differential resistance and bias-modulated metal-to-insulator transition in zigzag C 2 N- h 2D nanoribbon
The transmission spectra of W = 1.5 zigzag C2N-h2D nanoribbon under bias Vb = 0.00, 0.05, 0.10, 0.15, 0.20 and 0.25 V.Zero energy is the Fermi level.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC5382534&req=5

f3: The transmission spectra of W = 1.5 zigzag C2N-h2D nanoribbon under bias Vb = 0.00, 0.05, 0.10, 0.15, 0.20 and 0.25 V.Zero energy is the Fermi level.
Mentions: In order to investigate the physical mechanism of the peculiar I-V characteristic of our models, we first calculate the transmission spectra of W = 1.5 model under different biases as shown in Fig. 3. It can be found that as the bias increases the intensity of the transmission peak around the Fermi energy gradually decreases. Owing to the increasing integration region, the current firstly increases under a low bias. When the bias is higher than 0.1 V, the current begins to drop, so a NDR effect occurs. When the bias continues to increase to 0.25 V, the current decreases to zero due to the disappeared transmission peak. It is quite interesting that the insulator-like state can be maintained until the bias increases to 1.0 V.

View Article: PubMed Central - PubMed

ABSTRACT

Motivated by the fabrication of layered two-dimensional material C2N-h2D [Nat. Commun. 6, 6486 (2015)], we cut the single-layer C2N-h2D into a zigzag nanoribbon and perform a theoretical study. The results indicate that the band structure changes from semiconducting to metallic and a negative differential resistance effect occurs in the I-V curve. Interestingly, the current can be reduced to zero and this insulator-like state can be maintained as the bias increases. We find this unique property is originated from a peculiar band morphology, with only two subbands appearing around the Fermi level while others being far away. Furthermore the width and symmetry of the zigzag C2N-h2D nanoribbon can be used to tune the transport properties, such as cut-off bias and the maximum current. We also explore the electron transport property of an aperiodic model composed of two nanoribbons with different widths and obtain the same conclusion. This mechanism can be extended to other systems, e.g., hybrid BCN nanoribbons. Our discoveries suggest that the zigzag C2N-h2D nanoribbon has great potential in nanoelectronics applications.

No MeSH data available.


Related in: MedlinePlus