Bloch ferromagnetism of composite fermions

Hossain, Md. Shafayat; Zhao, Tongzhou; Pu, Songyang; Mueed, M. A.; Ma, M. K.; Villegas Rosales, K. A.; Chung, Y. J.; Pfeiffer, L. N.; West, K. W.; Baldwin, K. W.; Jain, J. K.; Shayegan, M.

doi:10.1038/s41567-020-1000-z

Bloch ferromagnetism of composite fermions

Journal Article · Mon Aug 17 04:00:00 EDT 2020 · Nature Physics

DOI:https://doi.org/10.1038/s41567-020-1000-z· OSTI ID:1773673

^[1]; ^[2]; Pu, Songyang ^[2]; Mueed, M. A. ^[3]; Ma, M. K. ^[3]; Villegas Rosales, K. A. ^[3]; Chung, Y. J. ^[3]; Pfeiffer, L. N. ^[3]; West, K. W. ^[3]; Baldwin, K. W. ^[3]; ^[2]; ^[3]

Princeton Univ., NJ (United States); Penn State
Pennsylvania State Univ., University Park, PA (United States)
Princeton Univ., NJ (United States)

In 1929, Felix Bloch suggested that the paramagnetic Fermi sea of electrons should make a spontaneous transition to a fully magnetized state at very low densities, because the exchange energy gained by aligning the spins exceeds the enhancement in the kinetic energy. However, experimental realizations of this effect have been hard to implement. In this work, we report the observation of an abrupt, interaction-driven transition to full magnetization, highly reminiscent of Bloch ferromagnetism. Our platform utilizes the two-dimensional Fermi sea of composite fermions near half-filling of the lowest Landau level. We measure the Fermi wavevector—which directly provides the spin polarization—and observe a sudden transition from a partially spin-polarized to a fully spin-polarized ground state as we lower the density of the composite fermions. Our theoretical calculations that take Landau level mixing into account provide a semi-quantitative account of this phenomenon.

View Accepted Manuscript (DOE)

Research Organization:: Pennsylvania State Univ., University Park, PA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF); Gordon and Betty Moore Foundation

Grant/Contract Number:: SC0005042; FG02-00ER45841

OSTI ID:: 1773673

Journal Information:: Nature Physics, Journal Name: Nature Physics Journal Issue: 1 Vol. 17; ISSN 1745-2473

Publisher:: Nature Publishing Group (NPG)Copyright Statement

Country of Publication:: United States

Language:: English

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