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Researchers identified two possible Mott-insulating pictures in magnetic superexchange couplings in Sr2IrO4

Researchers have identified two possible Mott-insulating pictures in magnetic superexchange couplings of Sr2IrO4, shedding light on the mechanism for superconductivity in doped La2CuO4. The study used different theories to analyze the magnetic interactions in the strong-to-intermediate coupling regime.

SourceHefei Institutes of Physical Science, Chinese Academy of Sciences·JournalPhysical Review B·TypeExperimental study·DateSep 27, 2021

Fiber tracking method delivers important new insights into turbulence

A new experimental method tracks the motion of fibers instead of particles to reveal previously hidden information about turbulent flows. The researchers developed an innovative solution using rigid fibers, which allowed them to measure the speed and direction of flow at two points a fixed distance apart.

SourceOkinawa Institute of Science and Technology (OIST) Graduate University·JournalPhysical Review X·TypeComputational simulation/modeling·DateSep 17, 2021

Partition function zeros are ‘shortcut’ to thermodynamic calculations on quantum computers

Researchers at North Carolina State University developed a new method to calculate thermodynamic properties using partition function zeros on quantum computers. By calculating the zeros of the partition function, they can determine free energy, entropy, and other properties without necessitating huge numbers of quantum computations.

SourceNorth Carolina State University·JournalScience Advances·TypeComputational simulation/modeling·DateAug 19, 2021

First signs of self-interacting dark matter?

Researchers observed four colliding galaxies and found a lag between dark matter and its associated galaxy, suggesting that dark matter interacts with forces other than gravity. This discovery could be the first evidence for rich physics in the dark sector, helping scientists better understand dark matter's nature.

SourceESO·JournalMonthly Notices of the Royal Astronomical Society·DateApr 14, 2015

Soft Lego built in the computer

A team of researchers has developed novel self-assembling materials, known as 'Soft Lego', which can form complex crystal structures with specific properties. These materials have potential applications in photonics and light guides, offering a new approach to the construction of materials at the macroscopic scale.

SourceUniversity of Vienna·JournalPhysical Review Letters·DateJan 17, 2013

'Hard' NP-complete computer problems explained

The article explains that 'hard' NP-complete problems are difficult due to discontinuous phase transitions, making them impractical to solve even with moderate-sized inputs. The research suggests exploiting certain properties of these abrupt transitions to make the problems easier by nailing down critical variables.

SourceCornell University·JournalNature·DateAug 12, 1999