Tag : Graphene

    Neutral electron flow detected in Graphene could shape future quantum computation

    Preeti
    June9/ 2022

    New Delhi (The Hawk): Physicists studying have detected counter propagating channels in two layered graphene along which certain neutral quasiparticles move in opposite directions breaking conventional norms. The detection has potential to shape the future quantum computation. When a strong magnetic field is applied to a 2D material or gas, the electrons at the interface – unlike the ones within the bulk – are free to move along the edges in what are called edge modes or channels – somewhat similar to highway lanes. This phenomenon called the quantum Hall effect has given rise to a platform for hosting exotic emerging quasiparticles, with properties that could lead to exciting applications in area of quantum computing. This edge movement, which is the essence of the quantum Hall effect, can lead to many interesting properties depending on the material and conditions. For conventional electrons, the current flows only in one direction dictated by the magnetic field (‘downstream’). However, physicists had earlier predicted that some materials can have counter-propagating channels where some quasiparticles can also travel in the opposite (‘upstream’) direction. However, these channels they have been extremely difficult to identify because they do not carry any electrical current. In a new study, researchers from the Indian Institute of Science (IISc) have provided “smoking gun” evidence for the presence of upstream modes along which certain neutral quasiparticles move in two-layered graphene. To detect these modes or channels, the team used a novel method employing electrical noise – fluctuations in the output signal caused by heat dissipation. The research supported by Science and Engineering Research Board (SERB), a statutory body un ...

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