Event Calendar
Physics Colloquium | Interplay of heat, charge and spin currents in quantum materials
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Dear All,
The department of physics invites you to a colloquium on "Interplay of heat, charge and spin currents in quantum materials"
Abstract: The interplay between spin, charge, and heat currents in quantum materials represents a compelling frontier in contemporary condensed matter physics. In this talk, I will present experimental investigations from our group spanning two key phenomena in this domain. First, I will discuss early measurements of the Spin Seebeck Effect in thin-film manganite devices, in which a rigorous disentanglement of the extrinsic Anomalous Nernst contribution yields excellent quantitative agreement with theoretical predictions. Second, I will demonstrate that a measurement geometry conventionally employed in spin-caloritronic studies can be extended to probe the magnon Hall effect. We identify an emergent transverse voltage originating from the momentum transfer imparted by surface magnons of a pyrochlore ferromagnet onto the conduction electrons of an adjacent metallic layer — a phenomenon analogous to a magnonic drag effect. Beyond providing an alternative experimental route to measuring the magnon Hall effect, these findings suggest that surface magnon excitations may be accessible through purely electrical detection schemes, opening new avenues for their systematic study.
About the Speaker: Dr. Sunil Nair is a Professor of Physics at Indian Institute of Science Education and Research (IISER), Pune. He obtained his PhD in experimental condensed matter physics from the Inter University Consortium for DAE facilities, Indore. Following a brief postdoctoral stint at the Tata Institute of Fundamental Research, Mumbai, he moved to the Max Planck Institute for Chemical Physics of Solids in Dresden, as a Humboldt Fellow. He was a Marie Curie fellow at the University of Oxford before joining IISER Pune in 2011. His research lies in Experimental condensed matter physics. Dr. Sunil Nair's group works on the synthesis of novel multifunctional materials, and in discerning the underlying physical processes which drive these novel electronic states. Of particular interest are systems in which properties can be tuned as a function of external control parameters like temperature, pressure, and magnetic or electric fields.
We look forward to your active participation.