Spinon Confinement and a Sharp Longitudinal Mode in Yb2Pt2Pb in Magnetic Field

Gannon, W J.; Zaliznyak, Igor A.; Wu, L. S.; Feiguin, A. E.; Tsvelik, A. M.; Demmel, F.; Qui, Y.; Copley, J. R. D.; Kim, M. S.; Aronson, M. C.

doi:10.1038/s41467-019-08715-y

Title: Spinon Confinement and a Sharp Longitudinal Mode in Yb₂Pt₂Pb in Magnetic Field

Journal Article · 15 January 2019 · Nature Communications

DOI: https://doi.org/10.1038/s41467-019-08715-y · OSTI ID:1489351

Gannon, W J. ^[1];

^[2]; Wu, L. S. ^[3]; Feiguin, A. E. ^[4]; Tsvelik, A. M. ^[2]; Demmel, F. ^[5]; Qui, Y. ^[6]; Copley, J. R. D. ^[6]; Kim, M. S. ^[7]; Aronson, M. C. ^[1]

Texas A & M Univ., College Station, TX (United States); Univ. of British Columbia, Vancouver, BC (Canada)
Brookhaven National Lab. (BNL), Upton, NY (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); South Univ. of Science and Technology of China, Shenzhen (China)
Northeastern Univ., Boston, MA (United States)
Rutherford Appleton Lab., Didcot (United Kingdom)
National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States)
Stony Brook Univ., Stony Brook, NY (United States)

Here, the fundamental excitations in an antiferromagnetic chain of spins-1/2 are spinons, de-confined fractional quasiparticles that when combined in pairs, form a triplet excitation continuum. In an Ising-like spin chain the continuum is gapped and the ground state is Neel ordered. Here, we report high resolution neutron scattering experiments, which reveal how a magnetic field closes this gap and drives the spin chains in Yb₂Pt₂Pb to a critical, disordered Luttinger-liquid state. In Yb₂Pt₂Pb the effective spins-1/2 describe the dynamics of large, Ising-like Yb magnetic moments, ensuring that the measured excitations are exclusively longitudinal, which we find to be well described by time-dependent density matrix renormalization group calculations. The inter-chain coupling leads to the confinement of spinons, a condensed matter analog of quark confinement in quantum chromodynamics. Insensitive to transverse fluctuations, our measurements show how a gapless, dispersive longitudinal mode arises from confinement and evolves with magnetic order.

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Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: SC0012704

OSTI ID:: 1489351

Report Number(s):: BNL--210832-2018-JAAM

Journal Information:: Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 10; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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Title: Spinon Confinement and a Sharp Longitudinal Mode in Yb₂Pt₂Pb in Magnetic Field