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    Quantum Anomaly in a Dirac Fermion System with Spacetime Dependent Mass

    Quantum Anomaly in a Dirac Fermion System with Spacetime Dependent Mass

    2022-4-27

    Scientists investigate quantum anomalies in a system of Dirac fermions with spacetime dependent mass and show that the anomaly formulas can be expressed in terms of superconnections.

    Theoretical Particle Physics

    Elementary particles, fields, and strings

    Read more
  • Spin Transport in a Two-Dimensional Tilted Dirac Electron System

    Spin Transport in a Two-Dimensional Tilted Dirac Electron System

    2022-4-13

    We propose that spin current in an organic conductor, α-(BETS)2I3, is an appropriate physical quantity to detect the topological nature of the material whose electrons obey a quasi-two-dimensional Dirac equation.

    Electronic transport in condensed matter

    Electronic structure and electrical properties of surfaces and nanostructures

  • Violation of Fluctuation-Dissipation Theorem Results in Robustness of Fluctuation Against Localization

    Violation of Fluctuation-Dissipation Theorem Results in Robustness of Fluctuation Against Localization

    2022-3-23

    We study equilibrium current fluctuations in systems without time-reversal symmetry, violating the fluctuation-dissipation theorem. Notably, the off-diagonal fluctuation is insensitive to system imperfections in contrast to other fluctuations and conductivity.

    Statistical physics and thermodynamics

    Electronic transport in condensed matter

    Electronic structure and electrical properties of surfaces and nanostructures

  • Four-Dimensional XY Quantum Phase Transition in Superfluid Helium-4

    Four-Dimensional XY Quantum Phase Transition in Superfluid Helium-4

    2022-3-18

    Liquid helium confined in nanopores exhibits a quantum superfluid transition at absolute zero. Investigations have revealed that the quantum nature also dominates the finite-temperature superfluid transition, obeying a simple mean-field theory.

    Structure and mechanical and thermal properties in condensed matter

  • Topological Aspects of a Nonlinear System: The Dimerized Toda Lattice

    Topological Aspects of a Nonlinear System: The Dimerized Toda Lattice

    2022-3-16

    A nonlinear topological phase is shown to emerge in the dimerized Toda lattice. It is experimentally detectable by measuring the voltage propagation in electric circuits.

    Electronic structure and electrical properties of surfaces and nanostructures

    Electronic transport in condensed matter

  • Unusual Nonlinear Conductivity in Charge-Ordered α-(BEDT-TTF)2I3

    Unusual Nonlinear Conductivity in Charge-Ordered α-(BEDT-TTF)2I3

    2022-3-9

    Unusual nonlinear conduction is detected in organic molecular salt α-(BEDT-TTF)2I3. The observed third-order nonlinear conductivity implies a quadrupole instability hidden in this charge-ordered organic salt.

    Electronic transport in condensed matter

  • Economic Irreversibility: The Universal Guiding Principle of Infection Control

    Economic Irreversibility: The Universal Guiding Principle of Infection Control

    2022-3-1

    It is preferable to avoid lockdowns, as lockdowns at seriously spread phases are very expensive. It would be economically better to utilize less intense countermeasures as early as possible to avoid lockdowns in later phases.

    Statistical physics and thermodynamics

    Cross-disciplinary physics and related areas of science and technology

  • High-Precision Observation of Cosmic Gamma-ray Sources with the GRAINE Telescope

    High-Precision Observation of Cosmic Gamma-ray Sources with the GRAINE Telescope

    2022-2-24

    A gamma-ray telescope developed jointly by universities in Japan promises an unprecedented imaging resolution that could help distinguish gamma-ray sources observed in our galaxy.

    Measurement, instrumentation, and techniques

  • Calculating Superconformal Index of 𝓝 = 4 Super-Yang-Mills Theory for Finite N

    Calculating Superconformal Index of 𝓝 = 4 Super-Yang-Mills Theory for Finite N

    2022-2-22

    The examination of AdS/CFT correspondence for finite N, where quantum gravitational effects become important, reveals that finite N corrections for the superconformal index can be reproduced as D-3 brane contributions.

    Theoretical Particle Physics

  • Realizing Spin Liquids Experimentally with Kapellasite-type Quantum Kagome Antiferromagnet

    Realizing Spin Liquids Experimentally with Kapellasite-type Quantum Kagome Antiferromagnet

    2022-2-10

    This study reports the observation of the spin fluctuation in a quantum kagome antiferromagnet CaCu3(OH)6Cl2·0.6H2O which persists down to 82 mK using the μSR technique.

    Magnetic properties in condensed matter

  • Phosphorous-Based Zintl Compounds as Viable Semimetals

    Phosphorous-Based Zintl Compounds as Viable Semimetals

    2022-2-4

    A black-phosphorus-derived Zintl compound, MoP4, is obtained by high-pressure synthesis. The material exhibits a non-quadratic large magnetoresistance and semi-metallic Seebeck behavior, as predicted by the first principles calculations yielding massive and non-symmorphic Dirac semimetal states.

    Electronic structure and electrical properties of surfaces and nanostructures

    Structure and mechanical and thermal properties in condensed matter

    Electron states in condensed matter

  • New Systematic Analysis Method of Identifying Microscopic Essential Couplings

    New Systematic Analysis Method of Identifying Microscopic Essential Couplings

    2022-1-31

    We propose a systematic method of identifying essential model parameters for nonlinear response tensors. The analysis results reveal fundamental couplings in nontrivial responses and promote further development of multiferroic responses.

    Electronic transport in condensed matter

    Dielectric, optical, and other properties in condensed matter

    Cross-disciplinary physics and related areas of science and technology

  • Shedding Light on Nonreciprocal Directional Dichroism at High Magnetic Fields in a Multiferroic Material

    Shedding Light on Nonreciprocal Directional Dichroism at High Magnetic Fields in a Multiferroic Material

    2022-1-19

    Large optical nonreciprocal directional dichroism, coupled with an antiferromagnetic order parameter, is observed in a high magnetic field via magneto-optical spectroscopy combined with a pulse magnet technique.

    Dielectric, optical, and other properties in condensed matter

    Magnetic properties in condensed matter

  • Twist in the Tale: Exploring the Dielectric Screening Effect in Twisted Bilayer Graphene

    Twist in the Tale: Exploring the Dielectric Screening Effect in Twisted Bilayer Graphene

    2022-1-12

    Although the screening of an external electric field, strongly influences the electronic states of two-dimensional material stack, it is not well understood. Magnetotransport measurements of twisted double bilayer graphene uncovered the screening of atomic layers.

    Electronic structure and electrical properties of surfaces and nanostructures

    Electronic transport in condensed matter

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