Related Experiment Video
Updated: Sep 27, 2025
13:56
Probe Type II Band Alignment in One-Dimensional Van Der Waals Heterostructures Using First-Principles Calculations
Published on: October 12, 2019
7.7K
One-dimensional quantum channel in bent honeycomb nanoribbons
Tong Wang1, Xi Jiang1, Jing Wang1
1Department of Physics and Hebei Advanced Thin Film Laboratory, Hebei Normal University, Shijiazhuang 050024, Hebei, China. zliu@hebtu.edu.cn.
Physical Chemistry Chemical Physics : PCCP
|April 7, 2022
Summary
Researchers engineered one-dimensional (1D) quantum channels in two-dimensional (2D) honeycomb nanoribbons (NR) by bending them. This strain-engineering approach creates robust channels for steering charge carriers without external magnetic fields.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Nanotechnology
Background:
- Controlling charge carrier directionality is crucial for advanced 2D material applications.
- Honeycomb nanoribbons (NR) are promising 2D materials with unique electronic properties.
Purpose of the Study:
- To theoretically propose a method for creating one-dimensional (1D) quantum channels in 2D honeycomb nanoribbons (NR).
- To investigate the effects of in-plane bending deformation on the electronic states within these nanoribbons.
Main Methods:
- Utilized the generalized Bloch theorem.
- Employed the self-consistent charge density-functional tight-binding (DFTB) method for theoretical calculations.
Main Results:
- In-plane bending deformation induces pseudo-magnetic fields in honeycomb NR.
- These fields lead to Landau quantization, localizing electronic states at the nanoribbon edges.
- Robust 1D quantum channels are formed, with energies tunable by the bending angle.
Conclusions:
- Bending deformation offers a novel strain-engineering method to create 1D quantum channels in 2D materials.
- This approach enables transverse magnetic focusing (TMF) without external magnetic fields.
- Provides a pathway for designing next-generation 2D material-based nano-devices.
Related Concept Videos
01:192D NMR: Heteronuclear Single-Quantum Correlation Spectroscopy (HSQC)
966
Heteronuclear single-quantum correlation spectroscopy (HSQC) is a 2D NMR technique that reveals one-bond correlations between hydrogen and a heteronucleus. The HSQC experiment is similar to the heteronuclear correlation experiment (HETCOR) but is more sensitive. In the HSQC spectrum, the proton chemical shift is plotted on the horizontal F2 axis, while the 13C chemical shift is plotted on the vertical F1 axis. The corresponding proton and 13C spectra are also shown. The HSQC contour plot does...
966
01:10Interpreting ¹H NMR Signal Splitting: The (n + 1) Rule
1.5K
In the AX proton spin system, proton A can sense the two spin states of a coupled proton X, resulting in a doublet NMR signal with two peaks of equal (1:1) intensity. When proton A is coupled to two equivalent protons (AX2 spin system), the spin states of each X can be aligned with or against the external field, creating three possible scenarios. This results in a 1:2:1 triplet signal, where the central peak corresponds to the chemical shift of A and is twice as large or intense as the...
1.5K
01:27¹H NMR: Long-Range Coupling
2.0K
The coupling interactions of nuclei across four or more bonds are usually weak, with J values less than 1 Hz. While these are usually not observed in spectra, the presence of multiple bonds along the coupling pathway can result in observable long-range coupling.
In alkenes, spin information is communicated via σ–π overlap, as seen in allylic (four-bond) and homoallylic (five-bond) couplings. These coupling interactions are stronger when the σ bond is parallel to the alkene...
In alkenes, spin information is communicated via σ–π overlap, as seen in allylic (four-bond) and homoallylic (five-bond) couplings. These coupling interactions are stronger when the σ bond is parallel to the alkene...
2.0K
01:12Two-Dimensional (2D) NMR: Overview
917
The 1D NMR spectrum of large and complex molecules like natural products has complicated splitting patterns and overlapping signals, which can be easily interpreted using 2-dimensional (2D) NMR. Unlike 1D NMR, 2D NMR has two frequency axes that provide the coupling information between the nucleus A and nucleus B in a molecule. The process from which 2D spectra are obtained has four steps.
The first step is the preparation period, during which nucleus A is excited with a radiofrequency pulse....
The first step is the preparation period, during which nucleus A is excited with a radiofrequency pulse....
917
01:162D NMR: Overview of Homonuclear Correlation Techniques
312
Homonuclear correlation spectroscopy (COSY) is a powerful technique used in Nuclear Magnetic Resonance (NMR) spectroscopy to study the correlations between nuclei of the same type within a molecule. It provides information about scalar couplings between adjacent nuclei, which helps determine connectivity and structural information. There are several COSY variants, each with its unique strengths and experimental parameters.
COSY90 is the standard two-dimensional (2D) COSY experiment that...
COSY90 is the standard two-dimensional (2D) COSY experiment that...
312
00:52¹H NMR of Conformationally Flexible Molecules: Temporal Resolution
937
At room temperature, the chair conformer of cyclohexane undergoes rapid ring flipping between two equivalent chair conformers at a rate of approximately 105 times per second. These two chair conformers are in equilibrium. The rapid ring flipping results in the interconversion of the axial proton to an equatorial proton and an equatorial to the axial proton. Such interconversions are too rapid and cannot be detected on the NMR timescale. Hence, the NMR spectrometer cannot distinguish between the...
937