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Instruments / Technical Area	Publication Details	Published	Actions
I05-ARPES	Structurally driven, reversible topological phase transition in a distorted square net material Xian Yang , Chia-Hsiu Hsu , Gokul Acharya , Junyi Zhang , Md shafayat Hossain , Tyler A. Cochran , Bimal Neupane , Zi-Jia Cheng , Santosh Karki Chhetri , Byunghoon Kim , Shiyuan Gao , Yu-Xiao Jiang , Maksim Litskevich , Jian Wang , Yuanxi Wang , Jin Hu , M. Zahid Hasan Physical Review Letters 136 DOI: 10.1103/spbv-1xg6 Show Abstract ▼ Abstract: Topological materials hold immense promise for exhibiting exotic quantum phenomena, yet achieving controllable topological phase transitions remains challenging. Here, we demonstrate a structurally driven, reversible topological phase transition in the distorted square net material GdPS, induced via in situ potassium dosing. Using angle-resolved photoemission spectroscopy and first principles calculations, we demonstrate a cascade of topological phases in the subsurface P layer: from a large, topologically trivial band gap to a gapless Dirac cone state with a 2 eV dispersion, and finally to a two-dimensional topological insulator as inferred from theory. This evolution is driven by subtle structural distortions in the first P layer caused by potassium adsorption, which in turn contribute to the band gap closure and topological phase transition. Furthermore, the ability to manipulate the topology of a subsurface layer in GdPS offers a unique route for exploring and controlling topological states in bulk materials.	Mar 2026
I05-ARPES	Visualizing the out-of-plane electronic dispersions in an intercalated transition metal dichalcogenide Xian P. Yang , Harrison Labollita , Zi-Jia Cheng , Hari Bhandari , Tyler A. Cochran , Jia-Xin Yin , Md. Shafayat Hossain , Ilya Belopolski , Qi Zhang , Yuxiao Jiang , Nana Shumiya , Daniel Multer , Maksim Liskevich , Dmitry A. Usanov , Yanliu Dang , Vladimir N. Strocov , Albert V. Davydov , Nirmal J. Ghimire , Antia S. Botana , M. Zahid Hasan Physical Review B 105 DOI: 10.1103/PhysRevB.105.L121107 Diamond Proposal Number(s): [29230] Show Abstract ▼ Abstract: Layered transition metal dichalcogenides have a rich phase diagram and they feature two-dimensionality in numerous physical properties. Co 1 / 3 NbS 2 is one of the newest members of this family where Co atoms are intercalated into the van der Waals gaps between NbS 2 layers. We study the three-dimensional electronic band structure of Co 1 / 3 NbS 2 using both surface and bulk sensitive angle-resolved photoemission spectroscopy. We show that the electronic bands do not fit into the rigid band shift picture after the Co intercalation. Instead, Co 1 / 3 NbS 2 displays a different orbital character near the Fermi level compared to the pristine NbS 2 compound and has a clear band dispersion in the k z direction despite its layered structure. Our photoemission study demonstrates the out-of-plane electronic correlations introduced by the Co intercalation, thus offering a different perspective on this compound. Finally, we propose how Fermi level tuning could lead to exotic phases such as spin density wave instability.	Mar 2022

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