Joji Nasu

Fermionic response from fractionalization in an insulating two-dimensional magnet

An intriguing state of matter known as a quantum spin liquid has been predicted to host Majorana fermions. A detailed theoretical and numerical analysis re-interprets existing Raman data for α-RuCl3 and uncovers direct evidence of a fermionic response.

Thermal fractionalization of quantum spins in a Kitaev model: Temperature-linear specific heat and coherent transport of Majorana fermions

Finite-temperature (

Vaporization of Kitaev Spin Liquids

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Thermal Transport in the Kitaev Model

) properties of a Kitaev model defined on a honeycomb lattice are investigated by a quantum Monte Carlo simulation, from the viewpoint of fractionalization of quantum

Phase diagram and collective excitations in an excitonic insulator from an orbital physics viewpoint

S=1/2

Doubly degenerate orbital system in honeycomb lattice: Implication of orbital state in layered iron oxide

spins into two types of Majorana fermions, itinerant and localized. In this system, the entropy is released successively at two well-separated

Polar charge fluctuation and superconductivity in organic conductors

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Magnetic Field Effects in a Correlated Electron System with Spin-State Degree of Freedom — Implications for an Excitonic Insulator —

scales, as a clear indication of the thermal fractionalization. We show that the high-

Absence of Jahn−Teller transition in the hexagonal Ba3CuSb2O9 single crystal

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Finite-Temperature Phase Transition to a Quantum Spin Liquid in a Three-Dimensional Kitaev Model on a Hyperhoneycomb Lattice

crossover, which is driven by itinerant Majorana fermions, is closely related with the development of nearest-neighbor spin correlations. On the other hand, the low-