Yu He - Yale University

16 Sept 2025, 14:00 → 17 Sept 2025, 20:30 US/Eastern

IAMM

 

Yu He joined Yale Applied Physics as an assistant professor in the fall of 2020. His research mainly utilizes light-matter interaction to investigate correlated electronic systems and other functional quantum materials. He focuses on dissecting novel materials’ microscopic degrees of freedom - electronic, lattice and spin - via angle-resolved photoemission spectroscopy and x-ray scattering techniques. Complementary techniques such as electric transport, surface decoration and crystal synthesis are employed to characterize and manipulate material properties. Prior to arriving at Yale, he worked as a Miller Research Fellow at the University of California at Berkeley. 

Website: https://sites.google.com/yale.edu/becton326/

Tuesday 16 September

Pickup

1 IAMM/CAMM Tea Tim

2 Research Meeting

Speaker: Norman Mannella

3 Research Meeting

Speaker: Elbio Dagotto

4 Optional Research Meeting / Lab tour

Speaker: Yishu Wang (University of Tennessee Knoxville)

18:45 Dinner

Yishu Wang, Dien Nguyen, Zachary Nicolaou

Wednesday 17 September

Pickup

5 Research Meeting

Speaker: Hu Miao (ORNL)

10:00 Talk Prep

6 Seminar: Alloying magnetic metals in “2D”: from old wisdom to new physics

Transition metal chalcogenide is a key host for van der Waals magnets, many of which maintain magnetism down to the thin layer limit. Recent discovery of ultrasensitive magnetism in Fe-based transition metal chalcogenide magnets - Ni-doped Fe5GeTe2 and Fe-intercalated NbS2 - raised the question of how such tunable magnetism is achieved, and how do they differ (if at all) from elemental magnetic thin films. Motivated by the uncanny resemblance between the (Ni,Fe)5GeTe2 and Ni-Fe alloy phase diagrams, we combine spin- and angle-resolved photoemission spectroscopy with operando synchrotron x-ray diffraction, and show that such group VIII element-rich "high-Tc" vdW magnets can to some extent be considered "atomically encapsulated" magnetic alloys within the vdW skeleton. However, their distinct magnetic site-selectivity, cross vdW gap interaction, and tunable low-energy flatbands all offer unique sensitivity and flexibility behind the highly tunable magnetism. I will also discuss our recent collaboration to use cross-domain machine-learning to identify thermodynamic transitions based on the spectral function of strongly fluctuating low dimensional materials.
Reference:
[1] Chen et al., Newton 1, 100066 (2025)
[2] Li, et al., arxiv: 2509.03327 (under review)

Zoom: https://tennessee.zoom.us/j/86292515289

11:30 Break

7 Lunch & Research Meeting

Speaker: Huibo Cao (ORNL)

8 Research Meeting

Speaker: Alan Tennant

9 Research Meeting

Speaker: Cristian Batista

10 Research Meeting

Speaker: Steve Johnston

11 Research Meeting

Speaker: Hanno Weitering

12 Research Meeting

Speaker: Jian Liu

13 Research Meeting

Speaker: Ruixing Zhang

14 Research Meeting

Speaker: Rob Moore (ORNL)

15 Lab tour (Ko lab)

Speaker: Wooin Yang

18:00 Dinner

Ruixing Zhang, Wonhee Ko