Soumya Sarkar

Ferroelectric spintronics in van der Waals materials

Soumya Sarkar, Sergio Alvarruiz, Zhiren He, Ahmet Avşar et autres

Abstract Nonvolatile control of electron spin using electric polarization offers a promising route toward energy-efficient spintronic devices. Early studies of conventional ferroelectrics, from GeTe to perovskite oxides, demonstrated that polarization switching can reversibly control spin textures and spin-to-charge conversion (SCC) in nonmagnetic …

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Written evidence submitted by the Centre for Neuromorphic Technologies (CeNT), University of Southampton, to the Low-Energy Computing Inquiry

Soumya Sarkar, Dimitra G. Georgiadou, David Barrie Thomas, Vahid Yazdanpanah

Multispectral Quantum Dot Tags for Advanced Anticounterfeiting Applications

Syeda Ramsha Ali, Yueyu Guo, Soumya Sarkar, K. De Groot et autres

Physical unclonable functions (PUFs) based on nanophotonic materials offer a promising route toward secure and tamper-resistant authentication. Here, we introduce a quantum dots (QDs)-driven optical fingerprinting (identifier) platform that utilizes four distinct photoluminescence (PL) emission peaks generated from two cadmium-free CIS/ZnS QDs …

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Qualitative method to re-evaluate cases of acute and accelerated silicosis from West Bengal

Pinaki Sensarma, Soumya Sarkar, Ujjwala Gupta, Jitumoni Rajkonwar et autres

Background: A marginal farmer’s income is inadequate to sustain a decent living. Hence, they work in brick fields or similar jobs during the lean season, which generates respirable dust containing silica. Lungs are sensitised. Lung already sensitised to crystalline silica, and the …

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An investigation into discharge gap phenomena and corner profile modelling in WEDM

Md. S. Biswas, Soumya Sarkar

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Case series of acute and accelerated silicosis among ramming mass workers from West Bengal

Soumya Sarkar, Pinaki Sensarma, Jitumoni Rajkonwar, Samit Kumar Carr

Ramming mass has 95-99% silica content. It is produced by crushing boulders. These boulders are mined mainly in the West Bardhhaman, West Bengal; Chot Nagpur plateau of Jharkhand, during crushing, producing granules of various sizes in special crushing units. These granules are …

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Can a ferroelectric diode be a selector-less, universal, non-volatile memory?

Soumya Sarkar, Deep Jariwala

Abstract Recent advances in silicon foundry-process compatible ferroelectric (FE) thin films have reinvigorated interest in FE-based non-volatile memory (NVM) devices. Ferroelectric diodes (FeDs) are two-terminal NVM devices exhibiting rectifying current–voltage hysteretic characteristics that enable self-selecting designs critical for high-density memory. We examine …

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High-efficiency WSe$_2$ photovoltaics enabled by ultra-clean van der Waals contacts

Kamal Kumar Paul, Cullen Chosy, Soumya Sarkar, Zhuangnan Li et autres

Layered transition metal dichalcogenide semiconductors are interesting for photovoltaics owing to their high solar absorbance and efficient carrier diffusion. Tungsten diselenide (WSe$_2$), in particular, has emerged as a promising solar cell absorber. However, defective metal-semiconductor interfaces have restricted the power conversion efficiency …

Large Scale Manufacture of Phase Pure Two-Dimensional Metallic MoS2 Nanosheets

Ziwei Jeffrey Yang, Zhuangnan Li, James Moloney, Leyi Loh et autres

Metallic monolayered [or two - dimensional (2D)] MoS2 nanosheets show tremendous promise for energy storage and catalysis applications. However, state-of-the-art chemical exfoliation methods require > 48 hours to produce milligrams of metallic 2D MoS2. Further, chemically exfoliated MoS2 nanosheets are a mixture …

Effect of Substrate on Sulfur Vacancy Defect-Mediated Photoluminescence in Two-Dimensional MoS2

Yiru Zhu, Zhepeng Zhang, Ye Wang, Soumya Sarkar et autres

High Resolution Image Download MS PowerPoint Slide Chalcogen vacancy defects in monolayer transition metal dichalcogenides form in-gap states that can trap excitons, leading to defect-mediated photoluminescence (PL) emission. Here, we show that room-temperature (RT, 300 K) PL from sulfur vacancies in defective …

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Can a ferroelectric diode be a selector-less, universal, non-volatile memory?

Soumya Sarkar, Deep Jariwala

Recent advances in silicon foundry-process compatible ferroelectric (FE) thin films have reinvigorated interest in FE-based non-volatile memory (NVM) devices. Ferroelectric diodes (FeDs) are two-terminal NVM devices exhibiting rectifying current-voltage hysteretic characteristics that enable self-selecting designs critical for high-density memory. We examine progress …

Spin injection in graphene using ferromagnetic van der Waals contacts of indium and cobalt

Soumya Sarkar, Saeyoung Oh, Peter Newton, Yang Li et autres

Graphene-based spintronic devices require efficient spin injection, and dielectric tunnel barriers are typically used to facilitate spin injection. However, the direct growth of ultrathin dielectrics on two-dimensional surfaces is challenging and unreliable. Here we report spin injection in graphene lateral spin valves …

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