研讨会——二维相互作用自旋物理：平带、自旋轨道耦合重整化与手性织构

seminar – Interacting spin physics in 2D: flat bands, SOC renormalization, and chiral textures

Spintec News by Alain Marty 2026-01-26 16:35 Original

摘要
曼彻斯特大学国家石墨烯研究所的Igor ROZHANSKIY将于2026年2月17日在SPINTEC举办研讨会，主题为二维材料中的自旋相互作用物理。他将重点介绍范德华磁体与石墨烯结合产生的强关联平带特性，以及单层过渡金属二硫化物中自旋轨道耦合的多体重整化效应。研讨会还将探讨二维材料平台中手性自旋织构（如斯格明子）的研究前景与应用潜力。

2026年2月17日星期二，SPINTEC实验室将迎来曼彻斯特大学国家石墨烯研究所的Igor ROZHANSKIY博士。他将于下午14:00举行一场学术研讨会，主题为“二维材料中的相互作用自旋物理：平带、自旋轨道耦合重整化与手性织构”。

研讨会地点设在格勒诺布尔CEA园区10.05号楼的IRIG/SPINTEC 445号报告厅。需注意，进入CEA现场参会须提前申请准入许可，申请截止日期为2月6日，请联系admin.spintec@cea.fr。会议同时提供线上接入，Zoom会议链接为：https://univ-grenoble-alpes-fr.zoom.us/j/98769867024?pwd=dXNnT3RMeThjYStybGVQSUN0TVdJdz09，会议ID：987 6986 7024，密码：025918。

报告摘要指出，二维材料及其异质结提供了一个可控的研究平台，其中交换作用、自旋轨道耦合（SOC）和电子相互作用共同塑造了自旋分辨的电子结构与响应。本次报告将围绕这一主题，串联讲者近期的两个研究方向。

第一部分聚焦于范德华磁体（三卤化铬）与石墨烯的结合体系。这些系统中狭窄的自旋极化导带使其易于受到电荷转移掺杂和强关联效应的影响。通过采用经DFT校准的有效紧束缚模型，报告将展示平带特征和长程跳跃过程如何决定低能谱，并促使系统进入具有重质量、强相互作用载流子的状态。

第二部分探讨单层过渡金属二硫属化物中SOC的多体重整化。交换效应可以以密度依赖的方式增强导带的自旋轨道劈裂。报告将阐明其内在机制，并讨论如何通过栅压调控输运和量子振荡测量（包括能提供额外诊断信息的具有特定能谷结构和层间耦合的多层构型）来推断该效应。

最后，报告将简要展望手性自旋织构（如斯格明子）的研究，探讨实空间手性如何贡献于横向信号，并强调在二维材料平台中可能存在的联系与开放性问题。

讲者Igor ROZHANSKIY毕业于圣彼得堡技术大学，曾担任Ioffe研究所的首席研究员，主要研究自旋相关输运现象。他亦与法国巴黎综合理工学院、芬兰拉彭兰塔大学有过合作与任职经历。2022年他转入以色列魏茨曼科学研究所，并于2023年加入曼彻斯特大学国家石墨烯研究所，现任副研究员。其研究集中于二维范德华材料、自旋电子学、自旋轨道效应和磁性斯格明子，并综合运用解析与数值方法。他已发表70余篇论文，并获得英国科学院、芬兰科学院、法国Gaspard Monge奖学金等多个机构的资助。

本次研讨会信息由Spintec实验室首发。

Summary
On February 17, 2026, Igor Rozhanskiy from the University of Manchester's National Graphene Institute will present a seminar at SPINTEC in Grenoble on spin physics in 2D materials. He will discuss his research on van der Waals magnets with graphene and many-body effects in transition metal dichalcogenides, exploring topics like flat bands and chiral spin textures such as skyrmions. The seminar will be accessible both in person and via video conference.

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.

Résumé
Le chercheur Igor Rozhanskiy du National Graphene Institute (Université de Manchester) présentera un séminaire le 17 février 2026 au CEA-Grenoble (SPINTEC) sur la physique du spin dans les matériaux 2D. Il abordera ses travaux récents sur les aimants van der Waals couplés au graphène et sur le renforcement des effets de couplage spin-orbite par les interactions électroniques dans les dichalcogénures de métaux de transition. La conférence visera à relier ces phénomènes à l'émergence de textures magnétiques chirales comme les skyrmions, avec des implications pour le développement de plateformes en spintronique.

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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A researcher presents fundamental physics research on spin interactions in 2D materials, which is foundational for developing future spintronic and quantum technologies.