Seminar Announcement: Interacting Spin Physics in 2D Materials

SPINTEC will host a seminar by Dr. Igor Rozhanskiy, a Research Associate from the National Graphene Institute at the University of Manchester, on Tuesday, February 17, 2026, at 14:00. The presentation, titled "Interacting spin physics in 2D: flat bands, SOC renormalization, and chiral textures," will explore advanced topics in two-dimensional material physics.

Event Logistics:

* Location: IRIG/SPINTEC, Auditorium 445, CEA Building 10.05 in Grenoble. Important: Physical access requires prior entry authorization; requests must be sent to admin.spintec@cea.fr before February 6th, 2026.

* Virtual Access: The seminar will be streamed via Zoom.

* Link: https://univ-grenoble-alpes-fr.zoom.us/j/98769867024?pwd=dXNnT3RMeThjYStybGVQSUN0TVdJdz09

* Meeting ID: 987 6986 7024

* Passcode: 025918

Seminar Abstract:

Dr. Rozhanskiy's talk will connect two recent research directions centered on how electron interactions, exchange effects, and spin-orbit coupling (SOC) govern spin-resolved electronic properties in 2D heterostructures.

1. Flat Bands & Strong Correlations in vdW Magnets: The first part focuses on van der Waals magnets, specifically chromium trihalides combined with graphene. These systems feature narrow, spin-polarized conduction bands that are highly susceptible to doping and strong electron correlations. Using density functional theory (DFT)-calibrated tight-binding models, Dr. Rozhanskiy will demonstrate how flat-band features and longer-range hopping processes define the low-energy spectrum, creating regimes with heavy, strongly interacting charge carriers.

2. Many-Body Renormalization of SOC: The second part addresses the many-body enhancement of spin-orbit coupling in monolayer transition metal dichalcogenides (TMDs). Exchange effects can significantly increase the conduction-band spin-orbit splitting in a density-dependent way. The talk will outline this mechanism and discuss how it can be detected through gated transport and quantum-oscillation measurements, including in multilayer configurations where valley structure and interlayer coupling offer additional diagnostic tools.

3. Outlook on Chiral Spin Textures: A brief outlook will connect these themes to chiral spin textures like magnetic skyrmions, examining how real-space chirality can generate transverse electrical signals and highlighting open questions for 2D material platforms.

Speaker Biography:

Dr. Igor Rozhanskiy graduated from St. Petersburg Technical University and previously served as a principal investigator at the Ioffe Institute, focusing on spin-dependent transport. His international career includes collaborations and appointments at École Polytechnique (France) and Lappeenranta University (Finland). He moved to the Weizmann Institute of Science (Israel) in 2022 before joining the University of Manchester in 2023. His research integrates analytical and numerical methods to study 2D van der Waals materials, spintronics, spin-orbit effects, and magnetic skyrmions. He is the author of over 70 publications and has received grants from the British Academy, the Finnish Academy of Sciences, and the Gaspard Monge fellowship in France, among others.

On Tuesday February 17th 2026, we have the pleasure to welcome in SPINTEC Igor ROZHANSKIY from National Graphene Institute, University of Manchester . He will give us a seminar at 14:00 entitled : Interacting spin physics in 2D: flat bands, SOC renormalization, and chiral textures

Place : IRIG/SPINTEC, auditorium 445 CEA Building 10.05 (presential access to the conference room at CEA in Grenoble requires an entry authorization. Request it before February 06th at admin.spintec@cea.fr)

video conference : https://univ-grenoble-alpes-fr.zoom.us/j/98769867024?pwd=dXNnT3RMeThjYStybGVQSUN0TVdJdz09

Meeting ID: 987 6986 7024

Passcode: 025918

Abstract: Two-dimensional materials and their heterostructures offer a controllable setting where exchange, spin-orbit coupling (SOC), and electron interactions shape the spin-resolved electronic structure and response. This seminar links two recent directions of my work through this common theme.

The first part focuses on van der Waals magnets (chromium trihalides) combined with graphene. Narrow, spin-polarized conduction bands make these systems susceptible to charge-transfer-driven doping and strong correlations. Using DFT-calibrated effective tight-binding models, I will show how flat-band features and longer-range hopping processes determine the low-energy spectrum and favor regimes with heavy, strongly interacting carriers.

The second part addresses many-body renormalization of SOC in monolayer transition metal dichalcogenides. Exchange effects can enhance the conduction-band spin-orbit splitting in a density-dependent manner. I will outline the underlying mechanism and discuss how it can be inferred from gated transport and quantum-oscillation measurements, including multilayer configurations where valley structure and interlayer coupling provide additional diagnostics.

A short outlook will touch on chiral spin textures, such as skyrmions, and how real-space chirality can contribute to transverse signals, emphasizing possible connections and open questions for 2D material platforms.

Bio: Graduated from St.Petersburg Technical University I have been working as a principal investigator at Ioffe Institute where my primary research focus has been on spin-dependent transport phenomena. I’ve also had collaborations and appointments at Ecole Polytechnique in France, Lappeenranta University in Finland. In 2022 moved to Weizmann Institute in Israel and in 2023 to National Graphene Institute at University of Manchester whre I presently work as Research Associate. My research focuses on 2D van der Waals materials, spintronics, spin-orbit effects, and magnetic skyrmions, integrating analytical and numerical approaches. I’m authoring 70+ publications and has received grants from the British Academy, Finnish Academy of Sciences, Gaspard Monge fellowship in France, and other funding bodies.

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