Related Experiment Video
Updated: Feb 15, 2026
10:18
Exfoliation and Analysis of Large-area, Air-Sensitive Two-Dimensional Materials
Published on: January 5, 2019
12.6K
Weak antilocalization effect in exfoliated black phosphorus revealed by temperature- and angle-dependent
Zhipeng Hou1,2, Chen Gong2, Yue Wang1
1Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, State Key Laboratory for Magnetism, Chinese Academy of Sciences, Beijing 100190, People's Republic of China.
Summary
This study provides evidence for surface resonance states in black phosphorus (BP) using magnetoconductivity measurements. The findings support the existence of these states, resolving ongoing scientific debates.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Surface Science
Background:
- Debates exist regarding the presence of surface resonance states (SRS) in black phosphorus (BP).
- Recent angle-resolved photoemission spectroscopy (ARPES) studies suggested the existence of SRS in BP.
- Clarifying the electronic properties of BP is crucial for its potential applications.
Purpose of the Study:
- To investigate the existence of surface resonance states (SRS) in black phosphorus (BP).
- To resolve conflicting experimental evidence regarding SRS in BP.
- To elucidate the surface electronic properties of high-quality BP single crystals.
Main Methods:
- Performed temperature- and angle-dependent magnetoconductivity measurements on exfoliated BP single crystals.
- Applied magnetic fields along the b-axis while electrical current flowed parallel to the ac-plane.
- Utilized the Hikami-Larkin-Nagaoka (HLN) model for data analysis.
Main Results:
- Observed a pronounced weak-antilocalization (WAL) effect in BP within a specific temperature range (8-16 K).
- The WAL effect exhibited surface-bulk coherent features, as indicated by angle-dependent measurements.
- HLN model fitting corroborated the observed WAL characteristics.
Conclusions:
- The observed weak-antilocalization (WAL) effect with surface-bulk coherence strongly supports the existence of surface resonance states (SRS) in black phosphorus (BP).
- These findings provide crucial experimental validation for theoretical predictions and resolve existing controversies.
- The study enhances the understanding of BP's electronic properties, paving the way for future device applications.
Related Concept Videos
02:55Temperature Dependence on Reaction Rate
89.4K
The Collision Theory
Atoms, molecules, or ions must collide before they can react with each other. Atoms must be close together to form chemical bonds. This premise is the basis for a theory that explains many observations regarding chemical kinetics, including factors affecting reaction rates.
The collision theory is based on the postulates that (i) the reaction rate is proportional to the rate of reactant collisions, (ii) the reacting species collide in an orientation allowing contact between...
Atoms, molecules, or ions must collide before they can react with each other. Atoms must be close together to form chemical bonds. This premise is the basis for a theory that explains many observations regarding chemical kinetics, including factors affecting reaction rates.
The collision theory is based on the postulates that (i) the reaction rate is proportional to the rate of reactant collisions, (ii) the reacting species collide in an orientation allowing contact between...
89.4K
01:12Temperature Dependent Deformation
422
In a nonhomogeneous rod made up of steel and brass, restrained at both ends and subjected to a temperature change, several steps are involved in calculating the stress and compressive load. Due to the problem's static indeterminacy, one end support is disconnected, allowing the rod to experience the temperature change freely. Next, an unknown force is applied at the free end, triggering deformations in the rod's steel and brass portions. These deformations are then calculated and added...
422
03:21Weak Base Solutions
25.6K
Some compounds produce hydroxide ions when dissolved by chemically reacting with water molecules. In all cases, these compounds react only partially and so are classified as weak bases. These types of compounds are also abundant in nature and important commodities in various technologies. For example, global production of the weak base ammonia is typically well over 100 metric tons annually, being widely used as an agricultural fertilizer, a raw material for chemical synthesis of other...
25.6K
04:02Weak Acid Solutions
43.6K
Few compounds act as strong acids. A far greater number of compounds behave as weak acids and only partially react with water, leaving a large majority of dissolved molecules in their original form and generating a relatively small amount of hydronium ions. Weak acids are commonly encountered in nature, being the substances partly responsible for the tangy taste of citrus fruits, the stinging sensation of insect bites, and the unpleasant smells associated with body odor. A familiar example of a...
43.6K
01:08Titration of a Weak Acid with a Weak Base
5.0K
Weak acids and bases do not undergo dissociation completely, and titrations between these two are rarely studied. When such studies are performed, say, for the titration of a weak acid with a weak base, the titration curve plots the change in pH as a function of the volume of base added. Take the titration of acetic acid with ammonia, for instance. During the titration, these two species form ammonium acetate and water, but the pH change is slow and gradual.
As a result, there is no simple...
As a result, there is no simple...
5.0K
01:21The Phosphorus Cycle
44.3K
Unlike carbon, water, and nitrogen, phosphorus is not present in the atmosphere as a gas. Instead, most phosphorus in the ecosystem exists as compounds, such as phosphate ions (PO43-), found in soil, water, sediment and rocks. Phosphorus is often a limiting nutrient (i.e., in short supply). Consequently, phosphorus is added to most agricultural fertilizers, which can cause environmental problems related to runoff in aquatic ecosystems.
44.3K