Magnetic Order in Organic Dirac Electron System α-(BETS)2I3

Article Physics, Multidisciplinary

Large Diamagnetism and Electromagnetic Duality in Two-Dimensional Dirac Electron System

S. Fujiyama et al.

Summary: A new 2D Dirac organic conductor with relativistic electromagnetic responses has been discovered in solids, demonstrating the revival of electromagnetic duality within the relativistic framework.

PHYSICAL REVIEW LETTERS (2022)

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Article Physics, Condensed Matter

First-principles study of the effective Hamiltonian for Dirac fermions with spin-orbit coupling in two-dimensional molecular conductor α-(BETS)2I3

Takao Tsumuraya et al.

Summary: Using first-principles density-functional theory calculations, Dirac electrons in quasi-two-dimensional molecular conductor alpha-(BETS)2I3 were characterized at a low temperature of 30 K. Spin-orbit coupling resulted in an exotic insulating state with an indirect band gap, and an effective Hamiltonian was developed to reproduce the DFT band structure.

EUROPEAN PHYSICAL JOURNAL B (2021)

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Article Physics, Multidisciplinary

Magnetic Torque due to Anisotropic Diamagnetism in Neutral BEDT-TTF Crystals

Shinya Uji et al.

Summary: The study found that neutral BEDT-TTF crystals exhibit anisotropic diamagnetic properties at room temperature, with diamagnetic susceptibility gradually increasing with decreasing temperature. Torque measurements showed that careful attention must be paid to quantitative discussion of torque signals in various organic materials.

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN (2021)

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Article Materials Science, Multidisciplinary

Pressure-induced phase switching of Shubnikov-de Haas oscillations in the molecular Dirac fermion system α-(BETS)2I3

Yoshitaka Kawasugi et al.

Summary: The study investigates the SdH oscillations in alpha-(BETS)2I-3 molecular conductor at 1.7K, showing that it is in the Dirac fermion phase under pressure. While the material is near the phase transition between strongly correlated insulating and Dirac fermion phases, it is a possible candidate for an ambient-pressure molecular Dirac fermion system. The Berry phase is zero at ambient pressure, but a π Berry phase emerges under pressure, indicating a suppressed metal-insulator crossover at around 0.5 GPa. This contrasts with the behavior of the pioneering molecular Dirac fermion system alpha-(BEDT-TTF)2I-3.

PHYSICAL REVIEW B (2021)

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Article Materials Science, Multidisciplinary

Ambient-pressure Dirac electron system in the quasi-two-dimensional molecular conductor α-(BETS)2I3

Shunsuke Kitou et al.

Summary: Through investigations on the crystal structures and electronic states of α-(BETS)(2)I-3, it was found that the system maintains inversion symmetry below T-MI and exhibits a metal-to-insulator transition. First-principles calculations revealed the presence of anisotropic Dirac cones and a small energy gap opened by spin-orbit interaction, suggesting that the system is a weak topological insulator.

PHYSICAL REVIEW B (2021)

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Article Materials Science, Multidisciplinary