Скачать или смотреть Carrier-Resolved Photo-Hall Effect: Unlocking a 140-year-old secret in Hall Effect

🏷 KOLOKIUM FISIKA KUANTUM 31-07-2024
“Carrier-Resolved Photo-Hall Effect: Unlocking a 140-year-old secret in Hall Effect”

🔖 PEMBICARA:

Oki Gunawan, Ph.D
IBM T. J. Watson Research Center, NY 10598, USA

🗒 KAPAN?

31 Juli 2024 (Rabu)
08.00-09.30 WIB

🏡 DI MANA?

Zoom Meeting BRIN Quantum:
https://bit.ly/kolokium-20240731

Meeting ID: 949 1975 7137
Passcode: quantum


📚 ABSTRACT:

The Hall effect is one of the most fundamental phenomena in physics and semiconductor R&D. It forms the basis for major discoveries such as integer and fractional quantum Hall effect. This effect allows us to extract three fundamental charge-carrier properties: carrier type, density, and mobility. Recently, we reported an exciting discovery of the “carrier-resolved photo-Hall effect” [1] which enables us to extract very rich information about majority and minority carriers, such as carrier density, mobility, recombination lifetime, and diffusion length. The technique rests on two discoveries: (1) a new equation relating Hall mobility difference (DmH), Hall coefficient (H), and conductivity (s): ΔμH = d(σ2H)/dσ, and (2) a novel highly-sensitive AC field Hall system based on rotating parallel-dipole-line (PDL) magnet. We have successfully applied this technique to high-interest materials like world-record perovskite solar cells, silicon, and AI/neuromorphic chip materials. This research reveals a more unified understanding of how to probe charge carriers using the most common excitations in nature: (1) electric field, (2) magnetic field, (3) photons (light), and (4) phonons (lattice vibration).

¹O. Gunawan et al, “Carrier-Resolved Photo-Hall Effect”, Nature 575, 151-155 (2019).

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