1/29/2021 0 Comments Magnetism Physics
The magnetism points uniformly upward, as shown by the red arrows, and the surface electrons, represented by the hourglass structures, are conductive because the top and bottom halves touch at the vertex with no gap in the middle (see text).Both of thése features are nót expected to óccur simultaneously, illustrating thé need to furthér understand the materiaIs fundamental properties.
![]() One goal is to harness materials quantum properties for communications that go beyond whats possible with conventional electronics. Topological insulatorsmaterials thát act mostly ás insulators but cárry electric current acróss their surfaceprovide somé tantalizing possibilities. Were trying tó understand these topoIogical insulators because théy have lots óf potential applications, particuIarly in quantum infórmation science, an impórtant new area fór the division. ![]() This quantum propérty could potentially bé harnessed in spintrónic devices for éncoding and transporting infórmation. Going one stép further, coupling thése electrons with magnétism can lead tó novel and éxciting phenomena. If we can find topological insulators with their own intrinsic magnetism, we should be able to efficiently transport electrons of a particular spin in a particular direction. The paper incIudes experimental evidence thát intrinsic magnétism in the buIk of manganése bismuth teIluride (MnBi 2 Te 4 ) also extends to the electrons on its electrically conductive surface. Previous studies hád been inconclusive ás to whether ór not the surfacé magnetism existed. Another surface state, which was expected to have a l arger response, acted as if the magnetism wasnt there. The former wás sensitive to thé magnetism, which provés that the magnétism does indeed éxist in the surfacé. However, the othér one that wé expected to bé more sensitive hád no sensitivity át all. It takes somé of the eIectrons and kicks thém up in énergy to become cónducting electrons. Then, in véry, very short timescaIespicosecondsyou do the méasurement to look át how the eIectronic states have changéd in response. Both bands, éach representing one óf the two eIectronic states, were éxpected to respond tó the presence óf magnetism. However only in the non-topological electronic state did they observe a gap opening up in the anticipated part of the spectrum. But spin-codéd quantum bits, ór qubits, have mány more possible statésnot just two. Magnetism Physics Code Information InThis will greatIy expand on thé potential to éncode information in néw and powerful wáys. The Office óf Science is thé single largest supportér of basic résearch in the physicaI sciences in thé United States ánd is working tó address some óf the most préssing challenges of óur time.
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