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Raman fingerprints of fractionalized Majorana excitations in the honeycomb iridate Ag3 LiIr2 O6

Pal, S and Kumar, V and Panda, DP and Sundaresan, A and Mahajan, AV and Muthu, DVS and Sood, AK (2022) Raman fingerprints of fractionalized Majorana excitations in the honeycomb iridate Ag3 LiIr2 O6. In: Physical Review B, 105 (23).

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Official URL: https://doi.org/10.1103/PhysRevB.105.235125


We report low-temperature (down to ∼5 K) Raman signatures of the recently discovered intercalated honeycomb magnet Ag3LiIr2O6, a putative Kitaev quantum spin liquid (QSL) candidate. The Kitaev QSL is predicted to host Majorana fermions as its emergent elementary excitations through a thermal fractionalization of entangled spins S=1/2. We observe evidence of this fractionalization in the low-energy magnetic continuum whose temperature evolution harbors signatures of the predicted Fermi statistics obeyed by the itinerant Majorana quasiparticles. The magnetic Raman susceptibility evinces a crossover from the conventional to a Kitaev paramagnetic state below the temperature of ∼80 K. Additionally, the development of the Fano asymmetry in the low-frequency phonon mode and the enhancement of integrated Raman susceptibilities below the crossover temperature signifies prominent coupling between the vibrational and Majorana fermionic excitations.

Item Type: Journal Article
Publication: Physical Review B
Publisher: American Physical Society
Additional Information: The copyright for this article belongs to the Authors.
Keywords: Binary alloys; Lithium alloys; Silver alloys; Temperature, Elementary excitations; Fermi statistics; Lower energies; Lows-temperatures; Majorana; Quantum spin liquid; Quasiparticles; Raman signatures; Temperature evolution; Thermal, Honeycomb structures
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Date Deposited: 28 Jul 2022 05:12
Last Modified: 28 Jul 2022 05:12
URI: https://eprints.iisc.ac.in/id/eprint/75006

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