FieldsStatistical physics and thermodynamics

Violation of FluctuationDissipation Theorem Results in Robustness of Fluctuation Against Localization
2022323
We study equilibrium current fluctuations in systems without timereversal symmetry, violating the fluctuationdissipation theorem. Notably, the offdiagonal 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

Economic Irreversibility: The Universal Guiding Principle of Infection Control
202231
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
Crossdisciplinary physics and related areas of science and technology

How Good is the TransitionState Theory?
20211130
For the first time, the main assumption of the transitionstate theory for the decay of complex quantum systems across a potential barrier was realized using a microscopic manybody Hamiltonian.
Statistical physics and thermodynamics
Nuclear physics

Electric Quadrupole Orders in fElectron Systems on the fcc Lattice
2021517
We theoretically showed that electric quadrupoles in some heavy fermion materials exhibit a very rich phase diagram including unique partiallyordered phases stabilized by an interaction specific to these systems.
Magnetic properties in condensed matter
Dielectric, optical, and other properties in condensed matter
Statistical physics and thermodynamics

Electronic Nematic Ordering Driven by Atomicscale Multipoles
2021513
Theoretical investigations have unearthed a plethora of electronic nematic orderings driven by the spatial distribution of atomicscale electric quadrupoles.
Magnetic properties in condensed matter
Dielectric, optical, and other properties in condensed matter
Statistical physics and thermodynamics

Phase Transition and Its Universality Class for a Quantum Spin Chain
2021329
We numerically diagonalize the DimerTrimer (DT) model Hamiltonian around the SU(3) symmetric point. As a result, we discover the phase transition at this point which belongs to the BerezinskiiKosterlitzThouless (BKT)like universality class.
Statistical physics and thermodynamics
Magnetic properties in condensed matter

Splitting Walls: Interplay of Different Orders in Multiferroic Materials
2021329
We theoretically showed an intrinsic splitting instability of composite domain walls in multiferroic materials under field drive. This instability is a direct result of the coexistence of multiple orders in the system.
Magnetic properties in condensed matter
Statistical physics and thermodynamics

Reducing the Number of Tests Using Bayesian Inference to Identify Infected Patients in Group Testing
2021322
Group testing is a method of identifying infected patients by performing tests on a pool of specimens. Bayesian inference and a corresponding belief propagation (BP) algorithm are introduced to identify the infected patients in group testing.
Statistical physics and thermodynamics
Crossdisciplinary physics and related areas of science and technology

How is Brownian Motion Affected by a Fluctuating Random Surface?
2021315
A researcher has developed a new theory to describe the Brownian motion of a small object that is confined in a fluctuating random surface.
Statistical physics and thermodynamics
Structure and mechanical and thermal properties in condensed matter

Using Analogy to Understand Localization in Quantum Annealing
2021315
Localization may cause the inefficiency of quantum annealing. The constrained quantum annealing of graph coloring provides a new viewpoint to analyze localization phenomena in quantum annealing.
Statistical physics and thermodynamics

What Dictates Nonlinear Behavior in Strongly Correlated Insulators?
202133
The nonlinear conduction (the deviation from Ohm's law) has been discovered universally in various correlated materials. This may be explained by the percolation conduction in disordered materials.
Electronic transport in condensed matter
Statistical physics and thermodynamics