Field- and polarization-dependent quantum spin dynamics in the honeycomb magnet <math xmlns="http://www.w3.org/1998/Math/MathML"><mrow><msub><mi>Na</mi><mn>2</mn></msub><msub><mi>Co</mi><mn>2</mn></msub><msub><mi>TeO</mi><mn>6</mn></msub></mrow></math>: Magnetic excitations and continuum

Patrick Pilch; Laur Peedu; Anup Kumar Bera; S. M. Yusuf; Urmas Nagel; Toomas Rõõm; Zhe Wang

doi:10.1103/PhysRevB.108.L140406

Letter

Field- and polarization-dependent quantum spin dynamics in the honeycomb magnet ${Na}_{2} {Co}_{2} {TeO}_{6}$ : Magnetic excitations and continuum

Patrick Pilch ¹, Laur Peedu ², Anup Kumar Bera ^3,4,*, S. M. Yusuf ^3,4, Urmas Nagel², Toomas Rõõm ², and Zhe Wang ^1,†

¹Department of Physics, TU Dortmund University, 44227 Dortmund, Germany
²National Institute of Chemical Physics and Biophysics, 12618 Tallinn, Estonia
³Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai 400 085, India
⁴Homi Bhabha National Institute, Anushaktinagar, Mumbai 400 094, India

^*akbera@barc.gov.in
^†zhe.wang@tu-dortmund.de

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Phys. Rev. B 108, L140406 – Published 11 October, 2023

DOI: https://doi.org/10.1103/PhysRevB.108.L140406

Abstract

We report terahertz spectroscopic measurements of quantum spin dynamics in the spin-1/2 honeycomb magnet ${Na}_{2} {Co}_{2} {TeO}_{6}$ as a function of applied magnetic field with different terahertz polarizations. Distinct field dependencies of the resolved spin dynamics are identified in three regimes, which are separated by two critical fields at $B_{c 1} \approx 7$ and $B_{c 2} \approx 10$ T. A polarization-selective continuum is observed in the intermediate phase, featuring spin fluctuations of a proximate quantum spin liquid.

Physical Review B

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Field- and polarization-dependent quantum spin dynamics in the honeycomb magnet ${Na}_{2} {Co}_{2} {TeO}_{6}$ : Magnetic excitations and continuum

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Field- and polarization-dependent quantum spin dynamics in the honeycomb magnet Na2Co2TeO6: Magnetic excitations and continuum

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Field- and polarization-dependent quantum spin dynamics in the honeycomb magnet ${Na}_{2} {Co}_{2} {TeO}_{6}$ : Magnetic excitations and continuum