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Ju-Hyung Kang coauthored the study connecting indium tin oxide's electronic-band shape with its optical response. The laboratory alumni record lists Juhyung Kang as a former research associate, alongside the corresponding Stanford email identity.^[ref][ref]

One way to understand the combined measurements is to compare the Drude model's mobility and optical-frequency relations. With a characteristic momentum relaxation time $\tau$, electron mobility obeys $\mu =e\tau /m^{\ast }$, while ${\omega }_p^2=n{e}^2/({\epsilon }_0{m}^{\ast })$. A change in mobility alone cannot distinguish a change in scattering time from a change in effective mass. An independent carrier density measurement and optical response impose additional constraints. Together, these probes constrain several material parameters that a single measurement leaves entangled.

By Xiaoge Liu, Junghyun Park, Ju-Hyung Kang, Hongtao Yuan, Yi Cui, Harold Hwang and Mark Brongersma. Applied Physics Letters 105, 181117 (2014). Figure 3: Hall measurements, carrier density, optical plasma frequency and mobility. Byline corroborated by Stanford SIMES: simes.stanford.edu/publications/quantum?page=21