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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	Signatures of weyl fermion annihilation in a correlated kagome magnet Ilya Belopolski , Tyler A. Cochran , Xiaoxiong Liu , Zi-Jia Cheng , Xian P. Yang , Zurab Guguchia , Stepan S. Tsirkin , Jia-Xin Yin , Praveen Vir , Gohil S. Thakur , Songtian S. Zhang , Junyi Zhang , Konstantine Kaznatcheev , Guangming Cheng , Guoqing Chang , Daniel Multer , Nana Shumiya , Maksim Litskevich , Elio Vescovo , Timur K. Kim , Cephise Cacho , Nan Yao , Claudia Felser , Titus Neupert , M. Zahid Hasan Physical Review Letters 127 DOI: 10.1103/PhysRevLett.127.256403 Diamond Proposal Number(s): [17924, 19313] Show Abstract ▼ Abstract: The manipulation of topological states in quantum matter is an essential pursuit of fundamental physics and next-generation quantum technology. Here we report the magnetic manipulation of Weyl fermions in the kagome spin-orbit semimetal Co 3 Sn 2 S 2 , observed by high-resolution photoemission spectroscopy. We demonstrate the exchange collapse of spin-orbit-gapped ferromagnetic Weyl loops into paramagnetic Dirac loops under suppression of the magnetic order. We further observe that topological Fermi arcs disappear in the paramagnetic phase, suggesting the annihilation of exchange-split Weyl points. Our findings indicate that magnetic exchange collapse naturally drives Weyl fermion annihilation, opening new opportunities for engineering topology under correlated order parameters.	Dec 2021

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