When material goes quantum, electrons slow down and form a crystal.
The shifting, scintillating pattern you can see when you stack two slightly misaligned window screens is called moire.
A similar interference effect occurs when scientists stack two-dimensional crystals with mismatched atomic spacings.
Moire superlattices display exotic physical properties that are absent in the layers that make up the patterns.
These properties are rooted in the quantum nature of electrons.
Researchers have discovered a new property in the moire superlattices formed in crystals made of tungsten diselenide /tungsten disulfide(WSe2/WS2).
In these two-dimensional crystals, the interactions between electrons become so strong that electrons “freeze” and form an ordered array.
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WSe2/WS2 moire superlattices turn out to be an optimal playground for tuning the interactions between electrons.
Foreign [Music] Material goes Quantum electrons slow Down and form a crystal the shifting Scintillating pattern you can see when You stack two slightly Miss Allen window Screens is called moir a similar Interference effect occurs when Scientists stack two-dimensional Crystals with mismatched Atomic spacings More Super lattices display exotic Physical properties that are absent in The layers that make up the patterns These properties are rooted in the Quantum nature of electrons researchers Have discovered a new property in the Mar Super lattices formed in crystals Made of tungsten de selenide tungsten d I s u l f i d e w s e 2ws2 in these Two-dimensional crystals the Interactions between electrons become so Strong that electrons freeze and form an Ordered array to stay up to date with Latest top stories make sure to Subscribe to this YouTube channel by Clicking the button above this video Wse2ws 2 more Super lattices turn out to Be an optimal playground for tuning the Interactions between electrons the Stronger these interaction things the More prominent the quantum mechanical Nature of solid materials this allows Exotic states of matter like Unconventional superconductivity to form
Researchers used lasers to observe the Electron motion without the artifacts That plague other measurement techniques They uncovered a rare Quantum state of Matter never before observed in more Super lattices understanding and Controlling the quantum motion of Electrons will allow scientists to build Microelectronic devices of the future And robust qubits for Quantum Computing In solids the energy levels that Electrons occupy form energy bands more Super lattices alter the atomic Periodicity seen by the electrons and Thus the energy bands more effects can Lead to Flat bands in which the energy Levels are squeezed together causing Electrons to lower their kinetic energy And thus to feel their Mutual repulsion More strongly a team of researchers at Lawrence Berkeley National Laboratory Lbnl used a novel Optical technique to Observe electron motion while changing The number of electrons injected in the Sample when only one carrier per more Unit cell was injected the electrons Were expected to move freely and thus Conduct electricity instead the sample Became insulating this result Illustrates the mon insulator state in Which electrons interact so strongly That they avoid being in the same cell If every cell is occupied then the Electrons stop moving the real surprise
Came when fewer electrons were injected So that only one half or one-third of The cells were occupied at these low Densities scientists expected the Electrons to feel their presence less And have high Mobility however the Sample turned out an insulator in Wse2ws2 electrons interact so strongly That they even avoid sitting on Neighboring sites this rare phenomenon Is known as wine or electron Crystal Lbnl researchers also demonstrated that In Wse2ws2 light with appropriate Polarization interacts with spin-up and Spin down electrons separately making it Possible to selectively change the Energy of electrons based on their spin In doing so they observe spin Excitations persisting orders of Magnitude longer than charge excitations This opens the door for the future Investigation of exotic spin states such As Quantum spin liquidity Foreign [Music]