Electronic Structure and Properties of Transition Metal Dichalcogenides
Summary
Transition metal dichalcogenides (TMDCs) encompass a family of layered compounds with the general formula MX₂, where M denotes a transition metal and X a chalcogen (S, Se or Te). In their bulk form, individual layers are held together by van der Waals forces, allowing mechanical or chemical exfoliation down to atomically thin monolayers. Dimensional reduction often converts an indirect band gap in the bulk into a direct band gap in the monolayer limit, accompanied by pronounced spin–orbit coupling and valley-selective optical transitions. Diverse polymorphs (for example 1T and 2H phases) exhibit semiconducting, metallic, charge-density-wave or even superconducting behaviour, governed by subtle changes in crystal symmetry, interlayer coupling and electron correlation. Electronic band structures can be tuned through external parameters such as strain, chemical intercalation, doping and electric fields, enabling control of charge carrier density, effective mass and excitonic binding energies. These attributes underpin a wide array of applications in nanoelectronics, optoelectronics, spintronics, energy conversion and catalysis, making TMDCs a focal point for both fundamental research and technological innovation.
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Electronic Structure and Properties of Transition Metal Dichalcogenides publication trend
The graph below shows the total number of articles in electronic structure and properties of transition metal dichalcogenides across all publications each year (not limited to Nature Index journals).
Technical terms
Monolayer: A single atomic layer of a material characterised by a two-dimensional structure.
Band gap: Energy difference between the valence and conduction bands that determines a semiconductor’s electronic behaviour.
Brillouin zone: Fundamental region of reciprocal (wavevector) space used to describe electronic band structures in crystalline solids.
Half-metal: A material that conducts electrons of one spin orientation while presenting an insulating gap to the opposite spin.
Curie temperature: The temperature above which a ferromagnetic material loses its spontaneous magnetisation.
Phonon: A quantised mode of lattice vibration that influences thermal transport and electron–phonon interactions.
Raman spectroscopy: A vibrational spectroscopic technique used to probe phonon modes and lattice dynamics.
Responsivity: A measure of a photodetector’s electrical output per unit of incident optical power.
References
- Development of ultra-sensitive broadband photodetector: a detailed study on hidden photodetection-properties of TiS2 nanosheets. Journal of Materials Research and Technology (2021).
- The intrinsic ferromagnetic half-metals with high Curie temperature of tetragonal XCrS4 (X=Ti, Zr) monolayer. AIP Advances (2024).
- Explaining Mysterious “Shoulder” Raman Band in TiS2 by Temperature-dependent Anharmonicity and Defects. The Journal of Physical Chemistry C (2023).
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