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Research Interest:
Developing new phenomenon and study the spin selective mechanism in chiral molecules using spin-Hall, spin valve, spin-transistor and electrochemical spin-chemistry.
Study the lasing action and whispering gallery modes coupling in semiconductor QDs.
Halide perovskites and semiconductor QDs for energy applications.
Exploring the potential application of chiral molecules and bio-derived electronics.
Recent Work Highlights (Last five years)
Recent Work Highlights (Last five years)
12. Chirality Induced Odd–Even Spin Selectivity in Self-Assembled Peptide-Based Helical Nanofibers (ACS Nano)
Highlights
We demonstrated that peptide-based helical nanofibers exhibit tunable chirality-induced spin selectivity (CISS), where the spin polarization reverses with the odd–even length of achiral spacers, providing the first experimental evidence that achiral molecular segments can control spin selectivity in the presence of a chiral group. The spin-dependent transport was consistently confirmed by magnetic-conductive AFM, Kelvin probe force microscopy, and spin-valve device measurements, revealing a strong correlation between molecular structure, chirality, and spin transport.
Nidhi et al., ACS Nano 2026, 20, 23, 16910–16918. doi.org/10.1021/acsnano.6c03626
11. Chirality induced long-range spin-selective transport in helical 3D metal–organic frameworks (Chemical Science)
Highlights
We demonstrated the CISS effect in homochiral three-dimensional metal–organic frameworks (MOFs), achieving a unique combination of high spin selectivity, long-range spin transport (>1 µm), and high current intensity through multidimensional electron transport pathways. The spin-selective transport was validated using spin-valve devices and correlated with contact potential difference measurements, providing new insights into the design of efficient chiral spintronic materials.
Pravesh et al., Chemical Science, 2026, 17, 10735-10743. doi.org/10.1039/d6sc01358a
10. Spin-Selective Anisotropic Magnetoresistance Driven by Chirality in DNA (Advanced Functional Materials.)
Highlights
Magnetoresistance measurements of 30 base-pair double-stranded DNA functionalized on a ferromagnetic surface reveal a pronounced angular dependence, with maximum spin selectivity for out-of-plane magnetization and nearly zero response for in-plane magnetization, demonstrating the anisotropic nature of the CISS effect. This anisotropic magnetoresistance highlights the strong coupling between molecular chirality and spin transport, underscoring the potential of chiral molecules for organic spintronic applications.
Das et al., Advanced Functional Materials. 2025, 35, 2425377. doi.org/10.1002/adfm.202425377
9. Protein Conformation Governs Spin-Selective Electron Transmission (Journal of Physical Chemistry Lett.)
Highlights
We investigated the effect of protein denaturation on the chiral-induced spin selectivity (CISS) effect in d-glucose oxidase (GOx) using Hall-effect and magnetoresistance measurements. The results show that disruption of the protein's secondary helical structure by thermal denaturation significantly reduces spin polarization, demonstrating that the intact secondary structure is the primary contributor to efficient spin-selective electron transport, even in solid-state devices.
Naupada et al., J. Phys. Chem. Lett. 2025, 16, 25, 6442–6446.doi.org/10.1021/acs.jpclett.5c01495
8. Long-Range Spin Transport in Chiral Gold (Advanced Materials )
Highlights
Chiral gold films enable room-temperature spin transport over several micrometers, far exceeding the spin diffusion length of conventional metals, while exhibiting a Hall effect without an external magnetic field. These findings demonstrate long-range spin information transfer in chiral metallic systems and are explained by the interplay of anisotropic electronic polarizability, spin–orbit coupling, and spin exchange interactions
Das et al., Advanced Materials 2025, 37, 2506523. doi.org/10.1002/adma.202506523
Highlights
Magnetoresistance is measured as a function of the angle between the magnetization of the ferromagnet and the surface normal. The angular distribution obtained only if the monolayer has significant effective spin orbit coupling (SOC), that includes contribution from the electron–phonon interactions and dissipation.
Das et al., Advanced Materials 2024, 36, 2313708
6. Spin Polarized Current in Chiral Organic Radical Monolayers (Journal of Material Chemistry A)
Highlights
In this context, we conducted a study to explore the spin filtering capabilities of a monolayer of thia-bridged triarylamine hetero[4]helicene radical cation chemisorbed on a metallic surface. Magnetic-conductive atomic force microscopy revealed efficient electron spin filtering at exceptionally low potentials.
Giaconi et al., Journal of Material Chemistry A. 12, 10029-10035, 2024
5. The role of electrons’ spin in DNA oxidative damage recognition (Cell Reports Physical Science )
Highlights
DNA is oxidatively damaged at different locations The enzyme-DNA recognition process involves charge and electrons’ spin polarization The importance of the electrons’
Zhu et al., Cell Reports Physical Science 3, 101157
4.Spin-induced asymmetry reaction-The formation of asymmetric carbon by electropolymerization (Science Advances)
4.Spin-induced asymmetry reaction-The formation of asymmetric carbon by electropolymerization (Science Advances)
Highlights
The process of forming a chiral polymer from an achiral reagent without a chiral catalyst demonstrates the power of spin-induced enantiospecific chemistry.
Bhowmick et al., Sci. Adv. 8, eabq2727 (2022)
3. Mutual monomer orientation to bias the supramolecular polymerization of [6] Helicenes and the resulting circularly polarized light and spin filtering properties (Journal of the American Chemical Society )
Highlights
We report on the synthesis and self-assembly of 2,15- and 4,13-disubstituted carbo[6]helicenes 1 and 2 bearing 3,4,5-tridodecyloxybenzamide groups. These helical supramolecular structures with high chiroptical activity, when deposited on conductive surfaces, revealed highly efficient electron-spin filtering abilities, with electron spin polarizations up to 80% for 1 and 60% for 2, as measured by magnetic conducting atomic force microscopy.
Rafael et. al., J. Am. Chem. Soc. 2022, 144, 17, 7709–7719. doi.org/10.1021/jacs.2c00556
2.Temperature-Dependent Chiral-Induced Spin Selectivity Effect: Experiments and Theory (J. Phys. Chem. C )
2.Temperature-Dependent Chiral-Induced Spin Selectivity Effect: Experiments and Theory (J. Phys. Chem. C )
Highlights
The theoretical explanation for the chiral-induced spin selectivity effect, in which electrons’ passage through a chiral system depends on their spin and the handedness of the system, remains incomplete. Although most experimental work was performed at room temperature, most of the proposed theories did not include vibrations. Here, we present temperature-dependent experiments and a theoretical model that captures all observations and provides spin polarization values that are consistent with the experimental results.
Das et al., J. Phys. Chem. C, 2022, 126, 3257-3264. doi.org/10.1021/acs.jpcc.1c10550
1. Metal Organic Spin Transistor (Nano Letters)
1. Metal Organic Spin Transistor (Nano Letters)
Highlights
We developed a spin transistor using these crystals and based on the chiral-induced spin selectivity effect. This device features a memristor type behavior, which depend on trapping both charges and spins. The spin properties are monitored by Hall signal and by an external magnetic field. The spin transistor exhibits nonlinear drain-source currents, with multilevel controlled states generated by the magnetization of the source. Varying the source magnetization enables a six-level readout for the two-terminal device.
Naama and Das et. al., Nano Lett. 2021, 21, 8657-8663. doi.org/10.1021/acs.nanolett.1c01865
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