Related Experiment Video
Updated: Oct 7, 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
Anisotropic nodal loop in NiB2 monolayer with nonsymmorphic configuration
Qian Xia1, Yang Hu1, Ya-Ping Wang2
1Spintronics Institute, School of Physics and Technology, University of Jinan, Jinan, Shandong 250022, P. R. China. sdy_liss@ujn.edu.cn.
Nanoscale
|January 11, 2022
Summary
Researchers discovered a new 2D nickel-boride (NiB2) material with a unique nodal-loop (NL) state. This state, protected by nonsymmorphic symmetry, offers tunable electronic properties through strain engineering.
Area of Science:
- Condensed matter physics
- Materials science
- Solid-state physics
Background:
- Two-dimensional (2D) materials with nodal-loop (NL) states are of significant interest.
- Metal-boride films present potential for realizing NL states due to their structural diversity.
Purpose of the Study:
- To propose and investigate a 2D NiB2 monolayer with an anisotropic NL nature.
- To explore the stability, symmetry protection, and tunability of the NL state in NiB2.
Main Methods:
- First-principles calculations were employed to study the electronic and structural properties of the 2D NiB2 monolayer.
- Analysis of thermal dynamics stability and symmetry protection mechanisms.
Main Results:
- The 2D NiB2 monolayer exhibits excellent thermal dynamics stability.
- A nodal-loop (NL) state with considerable Fermi velocity is identified, protected by nonsymmorphic glide mirror symmetry.
- Strain engineering effectively modulates NL anisotropy and induces self-doping, altering carrier type and concentration.
- The NL state demonstrates robustness against correlation effects.
Conclusions:
- The proposed 2D NiB2 monolayer is a promising candidate for experimental synthesis.
- Nonsymmorphic symmetry plays a crucial role in protecting the NL state.
- Strain engineering offers a viable route to tune the electronic properties of 2D NiB2 for potential applications.
Related Concept Videos
02:06Newman Projections
18.6K
Different notations are used to represent the three-dimensional structure of molecules on two-dimensional surfaces. One of the most commonly used representations is the dash-wedge formula. The dashed wedges, solid wedges, and the plane lines indicate the groups situated behind the plane, coming out of the plane, and in the plane, respectively.
The organic molecules rotate across the single bonds leading to numerous temporary three-dimensional structures of varying energy known as...
The organic molecules rotate across the single bonds leading to numerous temporary three-dimensional structures of varying energy known as...
18.6K
02:34Structural Isomerism
19.9K
Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly, SCN− can...
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly, SCN− can...
19.9K
01:09¹H NMR: Pople Notation
2.0K
The Pople nomenclature system classifies spin systems based on the difference between their chemical shifts. Coupled spins are denoted by capital letters with subscripts indicating the number of equivalent nuclei. When the coupled nuclei have well-separated chemical shifts, they are assigned letters that are far apart in the alphabet, such as A and X. When the difference in chemical shifts is small, coupled nuclei are named using adjacent letters of the alphabet (AB, MN, or XY).
A proton...
A proton...
2.0K
01:15Unsymmetric Bending - Angle of Neutral Axis
515
Unsymmetrical bending occurs when a structural member is subjected to bending moments in a plane that does not align with the member's principal axes. This scenario typically arises in beams and other structural components when loads are applied at non-ideal angles, introducing complexities in stress analysis.
When a bending moment is applied at an angle θ concerning the vertical axis of a symmetrical member, it can be resolved into components along the member's principal...
When a bending moment is applied at an angle θ concerning the vertical axis of a symmetrical member, it can be resolved into components along the member's principal...
515
01:10Nodal Analysis
1.2K
Nodal analysis is a fundamental method in electrical engineering used to simplify the process of circuit analysis. This method revolves around the concept of using node voltages as the primary variables for circuit analysis. The objective is to determine the voltage at each node in a circuit, which can then be used to find other quantities of interest, such as currents through specific components.
Consider, for instance, a simple circuit composed of three nodes and three resistors, as shown in...
Consider, for instance, a simple circuit composed of three nodes and three resistors, as shown in...
1.2K
01:11Nodal Analysis with Voltage Sources
1.4K
Nodal analysis is a remarkably effective method used in electrical engineering to simplify the analysis of complex circuits, including those with dependent or independent voltage sources. Its strength lies in its systematic approach to breaking down circuits into manageable components, making it easier for engineers to understand and solve.
Consider a circuit that contains four resistors and two voltage sources, as shown in Figure 1. One of these voltage sources is connected between a...
Consider a circuit that contains four resistors and two voltage sources, as shown in Figure 1. One of these voltage sources is connected between a...
1.4K