Related Experiment Video
Updated: Feb 13, 2026
10:54
Design, Fabrication, and Experimental Characterization of Plasmonic Photoconductive Terahertz Emitters
Published on: July 8, 2013
15.3K
Dimensionality-Driven Terahertz Dirac Magnons in Layered 3d Ferromagnets
Khalil Zakeri1, Arthur Ernst2,3
1Heisenberg Spin-dynamics Group, Physikalisches Institut, Karlsruhe Institute of Technology, Wolfgang-Gaede-Strasse 1, D-76131 Karlsruhe, Germany.
Nano Letters
|February 11, 2026
Summary
We discovered a new way to create terahertz Dirac magnons in thin magnetic films. These symmetry-protected magnons could lead to efficient, low-loss information transport.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Spintronics
Background:
- Terahertz Dirac magnons offer potential for low-loss information transport.
- Existing platforms for magnons face challenges in robustness and efficiency.
Purpose of the Study:
- To propose a novel platform for hosting terahertz Dirac magnons.
- To investigate the role of dimensionality and symmetry in Dirac magnon formation.
Main Methods:
- First-principles calculations
- Linear spin-wave theory
- Analysis of low-dimensional magnetic architectures
Main Results:
- Atomically designed magnetic layers with C3v symmetry exhibit Dirac magnon band crossings.
- A quantized Berry phase of ±π is observed.
- Dirac points are formed due to reduced dimensionality, unlike in bulk materials.
Conclusions:
- Low-dimensional magnetic structures provide a simple platform for terahertz Dirac magnons.
- Dimensionality is key to forming Dirac points in these systems.
- Tunable properties like Berry phase can be achieved by controlling structural and chemical parameters.
Related Concept Videos
01:31Ferromagnetism
3.2K
Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...
3.2K
01:21Layers of the Epidermis
8.8K
The epidermis, the outermost layer of the skin, is composed of several distinct layers. From deep to superficial, the layers of the epidermis are as follows:
Stratum Basale
Stratum basale, also known as the stratum germinativum, is the deepest layer of the epidermis. It is composed of a single layer of actively dividing cells called basal cells or basal keratinocytes. These cells constantly undergo cell division to replenish the upper layers of the epidermis. Additionally, melanocytes, which...
Stratum Basale
Stratum basale, also known as the stratum germinativum, is the deepest layer of the epidermis. It is composed of a single layer of actively dividing cells called basal cells or basal keratinocytes. These cells constantly undergo cell division to replenish the upper layers of the epidermis. Additionally, melanocytes, which...
8.8K
03:40Dimensional Analysis
65.2K
Dimensional analysis, also known as the factor label method, is a versatile approach for mathematical operations. The main principle behind this approach is: the units of quantities must be subjected to the same mathematical operations as their associated numbers. This method can be applied to computations ranging from simple unit conversions to more complex and multi-step calculations involving several different quantities and their units.
Conversion Factors and Dimensional Analysis
The unit...
Conversion Factors and Dimensional Analysis
The unit...
65.2K
01:27ATP Driven Pumps I: An Overview
9.9K
ATP-driven pumps, also known as transport ATPases, are integral membrane proteins. They have binding sites for ATP located on the membrane's cytosolic side and the ion-conducting domain in the transmembrane region. These pumps use the free energy released from ATP hydrolysis to move the solutes across cell membranes against an electrochemical gradient.
There are four main types of ATP-driven pumps - P-type, V-type, F-type, and ABC transporter. All these pumps are of varying complexities and...
There are four main types of ATP-driven pumps - P-type, V-type, F-type, and ABC transporter. All these pumps are of varying complexities and...
9.9K
01:30Thematic Layering in GIS
361
In the past, planning projects such as schools or public facilities required extensive manual effort to gather and compile data. Information such as property boundaries, soil characteristics, road networks, zoning regulations, and flood zones had to be sourced individually from courthouses, utility providers, and registry offices. Assembling these datasets into a coherent format often took several months, delaying project timelines.The introduction of Geographic Information Systems (GIS)...
361
01:15Layers of the Heart Wall
5.8K
The heart wall comprises three distinct layers: the epicardium, myocardium, and endocardium. The outermost layer, the epicardium, is the visceral layer of the serous pericardium, featuring a thin, transparent mesothelial surface and an inner layer of areolar connective tissue with fat deposits that increase with age.
The myocardium, the thickest layer, consists of cardiac muscle cells interconnected by intercalated discs and crisscrossing connective tissue fibers. These muscle fibers contract...
The myocardium, the thickest layer, consists of cardiac muscle cells interconnected by intercalated discs and crisscrossing connective tissue fibers. These muscle fibers contract...
5.8K