Cyclotron resonance inside the Mott gap: a fingerprint of emergent neutral fermions

Abstract

A major obstacle to identify exotic quantum phases of matter featuring spin-charge separation above one-dimension is the lack of tailored probes allowing to establish their presence in correlated materials. Here we propose an optoelectronic response that could allow to pinpoint the presence of certain spin-charge separated states with emergent neutral gapless fermions in two and three-dimensional materials. We show that even though these states behave like insulators under static electric fields, they can display clear cyclotron resonance peaks in their light absorption spectrum under static magnetic fields, but typically the principal Kohn mode will be missing in comparison to ordinary metals. This distinctive phenomena could be tested in materials such as triangular lattice organics, three-dimensional mixed valence insulators YbB${}_{12}$ and SmB${}_6$, and transition metal dichalcogenides 1T-TaS${}_2$ and 1T-TaSe${}_2$.

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Cited by in corpus (15)

• Thermal Hall signatures of non-Kitaev spin liquids in honeycomb Kitaev materials
• Solvable Periodic Anderson Model with Infinite-Range Hatsugai-Kohmoto Interaction: Ground-states and beyond
• Probing the Quantum Noise of the Spinon Fermi Surface with NV Centers
• The universal shear conductivity of Fermi liquids and spinon Fermi surface states and its detection via spin qubit noise magnetometry
• Magnetoelectric generation of a Majorana-Fermi surface in Kitaev's honeycomb model
• Hall anomaly, Quantum Oscillations and Possible Lifshitz Transitions in Kondo Insulator YbB${}_{12}$: Evidence for Unconventional Charge Transport
• Charge-Neutral Electronic Excitations in Quantum Insulators
• Charge neutral fermions and magnetic field driven instability in insulating YbIr${}_3$Si${}_7$
• Cyclotron resonance in Kondo insulator
• Broken symmetries and Kohn's theorem in graphene cyclotron resonance
• Quantum Oscillations in an Impurity-Band Anderson Insulator
• The Detection of Unconventional Quantum Oscillations in Insulating 2D Materials
• A Platform for Far-Infrared Spectroscopy of Quantum Materials at Millikelvin Temperatures
• Enhancement of charge-neutral fermionic excitation near spin-flop transition\\ in magnetic Kondo material YbIr${}_3$Si${}_7$
• Quantum oscillations in the heat capacity of Kondo insulator YbB12