Magnetic impurity as a local probe of the $U(1)$ quantum spin liquid with spinon Fermi surface

He, Wen-Yu; Lee, Patrick A.

doi:10.1103/physrevb.105.195156

Magnetic impurity as a local probe of the $U(1)$ quantum spin liquid with spinon Fermi surface

Journal Article · Tue May 31 04:00:00 EDT 2022 · Physical Review. B

DOI:https://doi.org/10.1103/physrevb.105.195156· OSTI ID:1979759

^[1]; Lee, Patrick A. ^[2]

Shanghai Technical University (China); Massachusetts Institute of Technology (MIT), Cambridge, MA (United States); OSTI
Massachusetts Institute of Technology (MIT), Cambridge, MA (United States)

We solve the problem of a magnetic impurity coupled to a U(1) quantum spin liquid with a spinon Fermi surface, and we compute the impurity spectral function. Using the slave rotor mean-field approach combined with gauge field fluctuations, we find that a peak located at the top of the lower Hubbard band and one at the bottom of the upper Hubbard band can emerge in the impurity spectral function. The peaks at the Hubbard band edges arise from the gauge field fluctuation-induced spinon-chargon binding inside the spinon Kondo screening cloud of the magnetic impurity. For a magnetic impurity embedded in a Mott insulator, our findings suggest that the emergence of a pair of peaks at the Hubbard band edges in the impurity density of states spectra provides strong evidence that the host Mott insulator is a U(1) quantum spin liquid with a spinon Fermi surface.

View Accepted Manuscript (DOE)

Research Organization:: Massachusetts Institute of Technology (MIT), Cambridge, MA (United States)

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

Grant/Contract Number:: FG02-03ER46076

OSTI ID:: 1979759

Journal Information:: Physical Review. B, Journal Name: Physical Review. B Journal Issue: 19 Vol. 105; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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