Quantum Materials by Twistronics
Lead Research Organisation:
University of Sheffield
Department Name: Physics and Astronomy
Abstract
Abstracts are not currently available in GtR for all funded research. This is normally because the abstract was not required at the time of proposal submission, but may be because it included sensitive information such as personal details.
People |
ORCID iD |
| Alexander Tartakovskii (Principal Investigator) |
Publications
Catanzaro A
(2024)
Resonant Band Hybridization in Alloyed Transition Metal Dichalcogenide Heterobilayers
in Advanced Materials
Genco A
(2022)
Ultrafast Exciton and Trion Dynamics in High-Quality Encapsulated MoS 2 Monolayers
in physica status solidi (b)
Gillard D
(2024)
Spin-order-dependent magneto-elastic coupling in two dimensional antiferromagnetic MnPSe3 observed through Raman spectroscopy
in npj 2D Materials and Applications
Louca C
(2023)
Interspecies exciton interactions lead to enhanced nonlinearity of dipolar excitons and polaritons in MoS2 homobilayers.
in Nature communications
Lyons T
(2022)
Giant effective Zeeman splitting in a monolayer semiconductor realized by spin-selective strong light-matter coupling
in Nature Photonics
Randerson S
(2024)
High Q Hybrid Mie-Plasmonic Resonances in van der Waals Nanoantennas on Gold Substrate
in ACS Nano
Sarcan F
(2023)
Understanding the impact of heavy ions and tailoring the optical properties of large-area monolayer WS2 using focused ion beam
in npj 2D Materials and Applications
Zotev P
(2023)
Van der Waals Materials for Applications in Nanophotonics
in Laser & Photonics Reviews
| Description | Bandstructure engineering using alloying is widely utilized for achieving optimized performance in modern semiconductor devices. While alloying has been studied in monolayer transition metal dichalcogenides, its application in van der Waals heterostructures built from atomically thin layers is largely unexplored. Here, heterobilayers made from monolayers of WSe2 (or MoSe2) and MoxW(1-x)Se2 alloy are fabricated and nontrivial tuning of the resultant bandstructure is observed as a function of concentration x. This evolution is monitored by measuring the energy of photoluminescence (PL) of the interlayer exciton (IX) composed of an electron and hole residing in different monolayers. In MoxW(1-x)Se2/WSe2, a strong IX energy shift of ˜100 meV is observed for x varied from 1 to 0.6. However, for x < 0.6 this shift saturates and the IX PL energy asymptotically approaches that of the indirect bandgap in bilayer WSe2. This observation is theoretically interpreted as the strong variation of the conduction band K valley for x > 0.6, with IX PL arising from the K - K transition, while for x < 0.6, the bandstructure hybridization becomes prevalent leading to the dominating momentum-indirect K - Q transition. This bandstructure hybridization is accompanied with strong modification of IX PL dynamics and nonlinear exciton properties. This work provides foundation for bandstructure engineering in van der Waals heterostructures highlighting the importance of hybridization effects and opening a way to devices with accurately tailored electronic properties. |
| Exploitation Route | This is the first comprehensive study of bandstructure engineering in transition metal dichalcogenides heterostructures. The results will be applied to any device development in these materials. |
| Sectors | Electronics Energy Other |
| URL | https://onlinelibrary.wiley.com/doi/full/10.1002/adma.202309644 |
| Title | Raw Data for: Spin-order-dependent magneto-elastic coupling in two dimensional antiferromagnetic MnPSe3 observed through Raman spectroscopy |
| Description | Layered antiferromagnetic materials have recently emerged as an intriguing subset of the two-dimensional family providing a highly accessible regime with prospects for layer-number-dependent magnetism. Furthermore, transition metal phosphorus trichalcogenides, MPX3 (M= transition metal; X= chalcogen) provide a platform on which to investigate fundamental interactions between magnetic and lattice degrees of freedom and further explore the developing fields of spintronics and magnonics. Here, we use a combination of temperature dependent Raman spectroscopy and density functional theory to explore magnetic-ordering-dependent interactions between the manganese spin degree of freedom and lattice vibrations of the non-magnetic sub-lattice via a Kramers-Anderson super-exchange pathway in both bulk, and few-layer, manganese phosphorus triselenide (MnPSe3). We observe a nonlinear temperature dependent shift of phonon modes predominantly associated with the non-magnetic sub-lattice, revealing their non-trivial spin-phonon coupling below the N'eel temperature at 74 K, allowing us to extract mode-specific spin-phonon coupling constants. |
| Type Of Material | Database/Collection of data |
| Year Produced | 2023 |
| Provided To Others? | Yes |
| URL | https://orda.shef.ac.uk/articles/dataset/Raw_Data_for_Spin-order-dependent_magneto-elastic_coupling_... |
| Description | Collaboration with the groups of Dr Yue Wang and Prof Thomas Krauss, University of York |
| Organisation | University of York |
| Department | Department of Physics |
| Country | United Kingdom |
| Sector | Academic/University |
| PI Contribution | University of Sheffield team came up with an idea of using layered materials for nano-photonic structures |
| Collaborator Contribution | Dr Yue Wang helped establishing fabrication of photonic structures from transition metal dichalcogenide and other layered materials |
| Impact | Multidisciplinary: physics from Sheffield and device fabrication from York Publication "Transition Metal Dichalcogenide Dimer Nanoantennas for Tailored Light-Matter Interactions", Panaiot G. Zotev*, Yue Wang*, Luca Sortino, Toby Severs Millard, Nic Mullin, Donato Conteduca, Mostafa Shagar, Armando Genco, Jamie K. Hobbs, Thomas F. Krauss, and Alexander I. Tartakovskii, ACS Nano 2022, 16, 4, 6493-6505, https://pubs.acs.org/doi/full/10.1021/acsnano.2c00802 |
| Start Year | 2020 |