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[post_content] => Abstract: Spin-selective electron transmission makes chiral molecules a promising candidate for applications ranging from molecular spintronics to chemical and pharmaceutical technologies. By controlling the relative spin orientation of electrons, it may be possible to influence electron-transfer processes and, consequently, spin-dependent chemical transformations. This phenomenon originates from the Chirality-Induced Spin Selectivity (CISS) effect, in which electron transmission through a chiral molecular system depends on the electron spin orientation and the handedness of the molecule. We have demonstrated through several experimental approaches that electron transmission through chiral molecules adsorbed on metallic surfaces is spin selective. Furthermore, the interplay between the metal-chiral molecule interface, electron correlations, molecular orientation, and the direction of the applied magnetic field gives rise to characteristic magnetoresistance behavior.
More recently, my research has moved toward understanding CISS at the single-molecule level using mechanically controllable break junctions (MCBJ). In this approach, a single chiral molecule is electrically connected between two metallic electrodes, enabling direct measurement of electron transmission through an individual molecular junction. This provides a route to investigate the CISS effect in the molecular limit, where effects arising from molecular structure, electrode-molecule coupling, transport channels, and spin-dependent transmission can be examined more directly. Ultimately, this work bridges the gap between ensemble measurements and single-molecule spin transport, providing a platform for understanding the microscopic origin of CISS and for developing future single-molecule spin filters, molecular spintronic devices, and spin-sensitive nanoscale sensors.
About the Speaker: Dr. Tapan Kumar Das is a Research Scientist at the Weizmann Institute of Science, Israel. He received his Ph.D. from the Indian Institute of Technology Madras (IIT Madras), where his doctoral research focused on charge transport and optoelectronic properties of molecular and nanoscale systems. His current research lies at the interface of physics, chemistry and, biology, with a particular focus on the Chirality-Induced Spin Selectivity (CISS) effect, molecular spintronics, and spin-dependent electron transport. His work explores spin-selective transport in chiral molecules, biomolecules, and materials using magnetoresistance, Hall-effect measurements, and, more recently, single-molecule mechanically controllable break-junction (MCBJ) techniques. His research aims to bridge ensemble and single-molecule spin transport toward applications in molecular spintronics, quantum-enabled technologies, and biosensing. He was part of the team recognized with the Royal Society of Chemistry’s 2022 Horizon Prize (Stephanie L Kwolek Award) for pioneering research on chiral materials for controlling electron and photon spin.
We look forward to your active participation.
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[post_content] => Abstract: Spin-selective electron transmission makes chiral molecules a promising candidate for applications ranging from molecular spintronics to chemical and pharmaceutical technologies. By controlling the relative spin orientation of electrons, it may be possible to influence electron-transfer processes and, consequently, spin-dependent chemical transformations. This phenomenon originates from the Chirality-Induced Spin Selectivity (CISS) effect, in which electron transmission through a chiral molecular system depends on the electron spin orientation and the handedness of the molecule. We have demonstrated through several experimental approaches that electron transmission through chiral molecules adsorbed on metallic surfaces is spin selective. Furthermore, the interplay between the metal-chiral molecule interface, electron correlations, molecular orientation, and the direction of the applied magnetic field gives rise to characteristic magnetoresistance behavior.
More recently, my research has moved toward understanding CISS at the single-molecule level using mechanically controllable break junctions (MCBJ). In this approach, a single chiral molecule is electrically connected between two metallic electrodes, enabling direct measurement of electron transmission through an individual molecular junction. This provides a route to investigate the CISS effect in the molecular limit, where effects arising from molecular structure, electrode-molecule coupling, transport channels, and spin-dependent transmission can be examined more directly. Ultimately, this work bridges the gap between ensemble measurements and single-molecule spin transport, providing a platform for understanding the microscopic origin of CISS and for developing future single-molecule spin filters, molecular spintronic devices, and spin-sensitive nanoscale sensors.
About the Speaker: Dr. Tapan Kumar Das is a Research Scientist at the Weizmann Institute of Science, Israel. He received his Ph.D. from the Indian Institute of Technology Madras (IIT Madras), where his doctoral research focused on charge transport and optoelectronic properties of molecular and nanoscale systems. His current research lies at the interface of physics, chemistry and, biology, with a particular focus on the Chirality-Induced Spin Selectivity (CISS) effect, molecular spintronics, and spin-dependent electron transport. His work explores spin-selective transport in chiral molecules, biomolecules, and materials using magnetoresistance, Hall-effect measurements, and, more recently, single-molecule mechanically controllable break-junction (MCBJ) techniques. His research aims to bridge ensemble and single-molecule spin transport toward applications in molecular spintronics, quantum-enabled technologies, and biosensing. He was part of the team recognized with the Royal Society of Chemistry’s 2022 Horizon Prize (Stephanie L Kwolek Award) for pioneering research on chiral materials for controlling electron and photon spin.
We look forward to your active participation.
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