Related Experiment Video
Updated: Jun 28, 2025
07:03
Measuring Magnetically-Tuned Ferroelectric Polarization in Liquid Crystals
Published on: August 15, 2018
8.8K
Phase-Dependent Magnetic Proximity Modulations on Valley Polarization and Splitting
Jin'an Li1, Zilong Chen1, Jiangpeng Zhou1
1Department of Physics, Engineering Research Center for Micro-Nano Optoelectronic Materials and Devices of Ministry of Education, OSED, Fujian Provincial Key Laboratory of Semiconductor Materials and Applications, Xiamen University, Xiamen 361005, People's Republic of China.
ACS Nano
|April 12, 2024
Summary
Magnetic interactions in 2D materials like VSe2 heterostructures enable precise control of electron valley properties. Different VSe2 phases offer distinct advantages for valleytronics at various temperatures and magnetic fields.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Quantum Information Science
Background:
- Valley degrees of freedom in transition metal dichalcogenides offer a platform for novel electronic devices.
- Magnetic proximity effects are explored to manipulate these valley properties.
Purpose of the Study:
- To investigate the phase-dependent magnetic proximity effects in VSe2/WX2 heterostructures.
- To modulate valleytronic properties using different phases of VSe2.
Main Methods:
- Fabrication of 1T-VSe2/WX2 and 2H-VSe2/WX2 heterostructures.
- Experimental characterization of valley polarization and splitting.
- First-principles calculations to elucidate magnetic proximity mechanisms.
Main Results:
- 1T-VSe2/WX2 heterostructures show improved room-temperature valley polarization.
- 2H-VSe2/WX2 heterostructures exhibit superior low-temperature performance and magnetic field sensitivity.
- Significant valley splitting with a large g_eff factor observed in 2H-VSe2/WS2.
Conclusions:
- Phase-dependent magnetic proximity mechanisms, including interfacial charge transfer (1T-VSe2) and exchange field (2H-VSe2), govern valleytronic modulation.
- Effective control of valley degrees of freedom is achieved, paving the way for valley quantum applications.
Keywords:
ferromagnetic/nonmagnetic heterostructuresphase-dependencetransition metal dichalcogenidesvalley polarizationvalley splittingMore Related Videos
Related Concept Videos
01:27π Electron Effects on Chemical Shift: Overview
1.1K
An applied magnetic field causes loosely bound π-electrons in organic molecules to circulate, producing a local or induced diamagnetic field over a large spatial volume. As the molecules tumble in solution, the field generated by π-electrons in spherical substituents results in a zero net field. However, the net field generated by π-electrons in non-spherical substituents is not zero. The effect of this induced field depends on the orientation of the molecule with respect to B0,...
1.1K
01:03Atomic Nuclei: Nuclear Spin State Overview
938
NMR-active nuclei have energy levels called 'spin states' that are associated with the orientations of their nuclear magnetic moments. In the absence of a magnetic field, the nuclear magnetic moments are randomly oriented, and the spin states are degenerate. When an external magnetic field is applied, the spin states have only 2 + 1 orientations available to them. A proton with = ½ has two available orientations. Similarly, for a quadrupolar nucleus with a nuclear spin value of...
938
01:23Atomic Nuclei: Nuclear Relaxation Processes
649
In the absence of an external magnetic field, nuclear spin states are degenerate and randomly oriented. When a magnetic field is applied, the spins begin to precess and orient themselves along (lower energy) or against (higher energy) the direction of the field. At equilibrium, a slight excess population of spins exists in the lower energy state. Because the direction of the magnetic field is fixed as the z-axis, the precessing magnetic moments are randomly oriented around the z-axis.
649
01:10Interpreting ¹H NMR Signal Splitting: The (n + 1) Rule
1.3K
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...
1.3K
01:13¹H NMR: Complex Splitting
1.3K
A proton M that is coupled to a proton X results in doublet signals for M. However, NMR-active nuclei can be simultaneously coupled to more than one nonequivalent nucleus. When M is coupled to a second proton A, such as in styrene oxide, each peak in the doublet is split into another doublet.
Splitting diagrams or splitting tree diagrams are routinely used to depict such complex couplings. While drawing splitting diagrams, the splitting with the larger coupling constant is usually applied...
Splitting diagrams or splitting tree diagrams are routinely used to depict such complex couplings. While drawing splitting diagrams, the splitting with the larger coupling constant is usually applied...
1.3K
01:29Potential Due to a Polarized Object
398
A neutral atom consists of a positively charged nucleus surrounded by a negatively charged electron cloud. When placed in an external electric field, the external electric force pulls the electrons and nucleus apart, opposite to the intrinsic attraction between the nucleus and the electrons. The opposing forces balance each other with a slight shift between the center of masses of the nucleus and the electron cloud, resulting in a polarized atom. On the other hand, a few molecules, like water,...
398