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3 results on '"Slaven Garaj"'

1. Modulation of Spin Dynamics in 2D Transition‐Metal Dichalcogenide via Strain‐Driven Symmetry Breaking

Author

Tao Liu, Du Xiang, Hong Kuan Ng, Zichao Han, Kedar Hippalgaonkar, Ady Suwardi, Jens Martin, Slaven Garaj, and Jing Wu

Subjects
spin–orbit splitting, spin–strain coupling, strain engineering, transition metal dichalcogenides, weak antilocalization, Science
Abstract

Abstract Transition metal dichalcogenides (TMDs) possess intrinsic spin–orbit interaction (SOI) with high potential to be exploited for various quantum phenomena. SOI allows the manipulation of spin degree of freedom by controlling the carrier's orbital motion via mechanical strain. Here, strain modulated spin dynamics in bilayer MoS2 field‐effect transistors (FETs) fabricated on crested substrates are demonstrated. Weak antilocalization (WAL) is observed at moderate carrier concentrations, indicating additional spin relaxation path caused by strain fields arising from substrate crests. The spin lifetime is found to be inversely proportional to the momentum relaxation time, which follows the Dyakonov–Perel spin relaxation mechanism. Moreover, the spin–orbit splitting is obtained as 37.5 ± 1.4 meV, an order of magnitude larger than the theoretical prediction for monolayer MoS2, suggesting the strain enhanced spin‐lattice coupling. The work demonstrates strain engineering as a promising approach to manipulate spin degree of freedom toward new functional quantum devices.

Published
2022
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2. Low-Dimensional Transition Metal Dichalcogenide Nanostructures Based Sensors

Author

Nian Bing Li, Bang Lin Li, Jinping Wang, David Tai Leong, Hao Lin Zou, Slaven Garaj, Chwee Teck Lim, and Jianping Xie

Subjects
Materials science, Nanostructure, Sensing applications, Graphene, High selectivity, Nanotechnology, 02 engineering and technology, 010402 general chemistry, 021001 nanoscience & nanotechnology, Condensed Matter Physics, 01 natural sciences, 0104 chemical sciences, Electronic, Optical and Magnetic Materials, Nanomaterials, law.invention, Biomaterials, Transition metal, Quantum dot, law, Electrochemistry, Hydrogen evolution, 0210 nano-technology
Abstract

Two-dimensional (2D) transition metal dichalcogenides (TMDs) nanostructures have been widely applied in environmental and biological analysis, biomedicine, electronic devices, and hydrogen evolution catalysis. Meanwhile, this excitement in 2D TMDs has spilled over to their counterparts of different dimensionalities like one-dimensional (1D) and zero-dimensional (0D) TMDs nanostructures. Eventual physical and chemical properties of TMDs nanostructures still remain to be highly dependent on their dimensionalities and size scale, and recently creatively exploring these physical and chemical properties is extremely impactful for the sensing field of TMD nanomaterials. Herein, we review a wide range of sensing applications based on not only graphene-like 2D TMDs nanostructures but also the rapidly emerging subclasses of 1D, and 0D TMDs nanostructures. Their unique and interesting structures, excellent properties, and valid preparation methods are also included and the analytical objectives, ranging from heavy metal ions to small molecules, from DNA to proteins, from liquids to even vapors, can be met with extremely high selectivity and sensitivity. We have also analyzed our current understanding of 0D and 1D TMDs nanostructures and learning from graphene with the goal of contributing fresh ideas to the overall development of more advanced future TMDs based sensors.

Published
2016

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