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Seminar 2.26.2026 @ 1 PM in BRK 1001
by Nancy Lee Black 12 Feb '26

12 Feb '26

Transport Phenomena in Chiral Tellurium: Chirality-Induced Spin Selectivity and Nonlinear Hall Effect Assistant Professor, Seon Namgung Ulsan National Institute of Science and Technology (UNIST), Ulsan, South Korea, Dept. of Physics and Quantum Sensing Application Center Thursday, February 26th @ 1:00 pm in BRK 1001 Abstract: The chirality-induced spin selectivity (CISS) effect, where chiral materials preferentially transmit electrons of a particular spin, has sparked intense interest through its scientific implications and spintronic applications such as giant magnetoresistance, anomalous Hall effect, selective enantiomer adsorption on a magnetic substrate, and enhanced electrocatalytic activity via spin polarization. Despite extensive research, its underlying mechanism is not clearly revealed yet. Even though the spatial distribution of spin polarization in chiral systems is one of the key clues to reveal the spin scattering mechanism in CISS, it has remained experimentally elusive. In this talk, CISS-based spin polarization induced by an electric current in nonmagnetic chiral tellurium nanowires will be demonstrated, which is probed by spatially resolved reflective magnetic circular dichroism measurements. The observed spin polarization scales linearly with current amplitude, aligns parallel to the current direction, reverses with chirality or current flow, indicative of CISS. Furthermore, the current-induced spin polarization exhibits identical signs in both the nanowire and electrodes, contrary to the presumed spin filter scenario so far. In addition, the spin relaxation lengths on graphene electrodes are measured to be several micrometers, in good agreement with previously reported values measured by electrical means such as spin valves. This work establishes a new paradigm for investigating spin-dependent phenomena in chiral materials and opens avenues for developing chirality-based spintronic and quantum devices. In addition, nonlinear Hall effect of Te will be presented, which is connected to the Berry curvature dipole of the inversion symmetry broken Te system. Bio: Seon Namgung is an assistant professor in the Department of Physics at the Ulsan National Institute of Science and Technology (UNIST), Ulsan, South Korea. He received his Ph.D. in Physics from Seoul National University in 2011, following his B.S. in Physics from the same institution, under the supervision of Prof. Seunghun Hong. From 2012 to 2019, he conducted postdoctoral research in the Department of Electrical and Computer Engineering at the University of Minnesota, where his work bridged physics, materials science, and device engineering. He subsequently held a postdoctoral position in the Department of Physics at Seoul National University from 2011 to 2012. Since joining UNIST in 2019, Prof. Namgung has led research on optoelectronic devices based on low-dimensional materials and the development of quantum sensors. In 2024, he was appointed Director of the Quantum Sensing Application Center at UNIST, where he focuses on advancing quantum-enabled sensing technologies and their real-world applications. Host: Prof. Zubin Jacob,| Email: zjacob(a)purdue.edu

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Save the dates: April 27 Birck Industry Day / April 28 Birck Research Symposium
by Neil R Dilley 11 Feb '26

11 Feb '26

[cid:image001.png@01DC9B2B.3EE84260] -- Neil R. Dilley, Ph.D. Research Manager Birck Nanotechnology Center , Rm 1014 1205 Mitch Daniels Blvd. West Lafayette, IN 47907-2057 765-496-6080

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February 11th - Birck Seminar Series, David Cappelleri, ME/BME, “Magnetic Microrobots for Biomedical Applications”
by Kelli R Dawson 04 Feb '26

04 Feb '26

Dear colleagues, Please join us for the next Birck Seminar Series talk, sponsored by Kepler Computing, on Wednesday, February 11th at 2:00 PM in BRK 1001. David Cappelleri, School of Mechanical Engineering, Weldon School of Biomedical Engineering will present: "Magnetic Microrobots for Biomedical Applications" Please note there also an option to join the seminar via Microsoft Teams<https://teams.microsoft.com/l/meetup-join/19%3ameeting_M2M2NWQ4MjAtZTNiYi00…>. [cid:4f5cf515-641b-4147-b4a9-9917df603fab] [cid:fb0b934b-5875-4722-81a5-96e5a70a689e] Thank you, Kelli Kelli Dawson, M.Sc Operations Administrator Birck Nanotechnology Center, BRK 1027 O: 765-494-3509 C: 765-532-4519 https://birck.research.purdue.edu/ [cid:a7b36a15-4871-429b-b914-9ed1fe77c120]

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February 4th - Birck Seminar Series, Libai Huang, Dept. of Chem, ""Imaging Exciton Transport and Quantum Interactions with Ultrafast Microscopy."
by Kelli R Dawson 28 Jan '26

28 Jan '26

Dear colleagues, Please join us for the next Birck Seminar Series talk, sponsored by Kepler Computing, on Wednesday, February 4th at 2:00 PM in BRK 1001. Libai Huang, Department of Chemistry will present: "Imaging Exciton Transport and Quantum Interactions with Ultrafast Microscopy." Please note there also an option to join the seminar via Microsoft Teams<https://teams.microsoft.com/l/meetup-join/19%3ameeting_M2E3YmMyOGQtMGFkYi00…>. [X] [X] Thank you, Kelli Kelli Dawson, M.Sc Operations Administrator Birck Nanotechnology Center, BRK 1027 O: 765-494-3509 C: 765-532-4519 https://birck.research.purdue.edu/ [cid:5d46e4ec-c553-4e31-b2c4-af67c964c3c0]

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Birck Seminar Series, Feb. 18th: Krishna Jayant / BME, "Dynamic Delays and Subspaces Sculpt Motor Information Flow: Insights from Multimodal Neurotechnologies"
by Neil R Dilley 28 Jan '26

28 Jan '26

https://teams.microsoft.com/meet/22328939735319?p=M8VMbJxrFw5RfqEf4i<https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2Fteams.mic…> [cid:image001.png@01DC9025.18B3D2A0] [cid:image002.png@01DC9025.18B3D2A0] -- Neil R. Dilley, Ph.D. Research Manager Birck Nanotechnology Center , Rm 1014 1205 Mitch Daniels Blvd. West Lafayette, IN 47907-2057 765-496-6080

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Birck Seminar Series: Krishna Jayant / BME, "Dynamic Delays and Subspaces Sculpt Motor Information Flow: Insights from Multimodal Neurotechnologies"
by Neil R Dilley 28 Jan '26

28 Jan '26

https://teams.microsoft.com/meet/22328939735319?p=M8VMbJxrFw5RfqEf4i<https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2Fteams.mic…> [cid:image001.png@01DC9023.B7491F30] [cid:image002.png@01DC9024.0CBC4640]

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Birck Seminar Series: Joseph Lukens / ECE, "Somewhere over the quantum rainbow: the integrated future of frequency-bin quantum information processing"
by Neil R Dilley 28 Jan '26

28 Jan '26

https://teams.microsoft.com/meet/26182136378651?p=yFBZCFjg0smAGUfSn4<https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2Fteams.mic…> [cid:image001.png@01DC9024.75BDD5F0] [cid:image002.png@01DC9024.75BDD5F0]

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Birck Seminar Series: Krishna Jayant / BME, "Dynamic Delays and Subspaces Sculpt Motor Information Flow: Insights from Multimodal Neurotechnologies"
by Neil R Dilley 28 Jan '26

28 Jan '26

https://teams.microsoft.com/meet/22328939735319?p=M8VMbJxrFw5RfqEf4i<https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2Fteams.mic…> [cid:image001.png@01DC9023.B7491F30] [cid:image002.png@01DC9024.0CBC4640]

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Birck Seminar Series: Chen-Lung Hung, Physics, "Building a novel quantum light-matter interface with cold atoms coupled to a nanophotonic circuit"
by Neil R Dilley 23 Jan '26

23 Jan '26

MS Teams<https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2Fteams.mic…> [cid:image001.png@01DC8C43.315BCEB0] [cid:image002.png@01DC8C44.6E20F270]

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January 28th - Birck Seminar Series, Alex Ruichao Ma/Physics Dept., "Exploring Synthetic Quantum Matter with Superconducting Circuit: How to control and probe quantum correlations using dissipation"
by Kelli R Dawson 21 Jan '26

21 Jan '26

Dear colleagues, Please join us for the next Birck Seminar Series talk, sponsored by Kepler Computing, on Wednesday, January 28 at 2:00 PM in BRK 1001. Alex Ruichao Ma, Assistant Professor of Physics and Astronomy, will present: "Exploring Synthetic Quantum Matter with Superconducting Circuits: How to control and probe quantum correlations using dissipation." Please note there also an option to join the seminar via Microsoft Teams<https://teams.microsoft.com/l/meetup-join/19%3ameeting_ZWIwYWRlMGMtNjU4YS00…>. [cid:aa5eb2a7-4f71-4bb4-9925-623520bcc1fc] [X] Kelli Dawson, M.Sc Operations Administrator Birck Nanotechnology Center, BRK 1027 O: 765-494-3509 C: 765-532-4519 https://birck.research.purdue.edu/ [cid:a5cc3873-fb11-46d2-a2ff-fc07093cc22c]

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