Fingerprints of composite fermion Lambda levels in scanning tunneling microscopy

Pu, Songyang; Balram, Ajit C.; Hu, Yuwen; Tsui, Yen-Chen; He, Minhao; Regnault, Nicolas; Zaletel, Michael P.; Yazdani, Ali; Papić, Zlatko

doi:10.1103/PhysRevB.110.L081107

Title: Fingerprints of composite fermion Lambda levels in scanning tunneling microscopy

Journal Article · 14 August 2024 · Physical Review. B

DOI: https://doi.org/10.1103/PhysRevB.110.L081107 · OSTI ID:2429632

;

; Hu, Yuwen; Tsui, Yen-Chen;

; Regnault, Nicolas; Zaletel, Michael P.; Yazdani, Ali;

A composite fermion (CF) is a topological quasiparticle that emerges from a nonperturbative attachment of vortices to electrons in strongly correlated two-dimensional materials. Similar to noninteracting fermions that form Landau levels in a magnetic field, CFs can fill analogous “Lambda” levels, giving rise to the fractional quantum Hall (FQH) effect of electrons. Here, we show that Lambda levels can be directly visualized through the characteristic peak structure in the signal obtained via spectroscopy with scanning tunneling microscopy (STM) on a FQH state. Complementary to transport, which probes the low-energy properties of CFs, we show that features in STM spectra can be interpreted in terms of Lambda levels. We numerically demonstrate that STM spectra can be accurately modeled using Jain's CF theory. Our results show that STM provides a powerful tool for revealing the anatomy of FQH states and identifying physics beyond the noninteracting CF paradigm. Published by the American Physical Society 2024

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Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: FG02-07ER46419

OSTI ID:: 2429632

Journal Information:: Physical Review. B, Journal Name: Physical Review. B Journal Issue: 8 Vol. 110; ISSN 2469-9950; ISSN PRBMDO

Publisher:: American Physical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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