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For Cornell University Department of Physics in 2021-2023, the graph shows 50 visible PIs and 41 internal PI collaborations. The dominant subject mix is Physics and Astronomy as the leading field (47% of slots across 42 PIs; 42 labels), Atomic and Molecular Physics, and Optics as the leading subfield (14% of slots across 17 PIs; 17 labels), and Cosmology and Gravitation Theories as the leading topic (8% of slots across 11 PIs; 11 labels). The network looks reasonably well-rounded, with visible collaboration groups but not so much concentration that one field explains the whole department. The top weighted PIs are Gennady Shvets (22 weighted works; Photonic Crystals and Applications, Photonic and Optical Devices). The most visible ties are Kin Fai Mak and Jie Shan (21 shared works, weight 10.2). The standout breakdown groups are group 1 with 9 PIs, 8 internal connections, weight 16.2, around Atomic and Molecular Physics, and Optics, Condensed Matter Physics, Materials Chemistry, led by David A. Muller, Daniel C. Ralph, Yunqiu Kelly Luo.