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Physicists Have Directly Imaged Landau Levels For The First Time!
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<blockquote data-quote="Opmmur" data-source="post: 58619" data-attributes="member: 13"><p><span style="font-size: 18px">Physicists Have Directly Imaged Landau Levels For The First Time!</span></p><p> </p><p><span style="font-size: 15px">Physicists have directly imaged Landau Levels – the quantum levels that determine electron behaviour in a strong magnetic field – for the first time since they were theoretically conceived of by Nobel prize winner Lev Landau in 1930. </span></p><p> </p><p><span style="font-size: 15px"> Using scanning tunnelling spectroscopy - a spatially resolved probe that interacts directly with the electrons - scientists at institutions including the University of Warwick and Tohoku University have revealed the internal ring-like structure of these Landau Levels at the surface of a semiconductor. </span></p><p> </p><p><span style="font-size: 15px">The experimental challenge in the work was to have sufficient spatial resolution in order to overcome the intrinsic disorder in the material which usually only allows the observation of smeared out “drift” states. </span></p><p> </p><p><img src="http://www.messagetoeagle.com/images/landaulevels01.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p><em>This shows experimentally measured Landau Level 1. Credit: University of Warwick</em></p><p></p><p><span style="font-size: 15px">The images clearly show that Landau was right when he predicted that, in a clean system, the electrons would take on the form of concentric rings, the number of which increase according to their energy level. </span></p><p></p><p><span style="font-size: 15px"> This simple counting behaviour forms the basis of the so-called quantum Hall effect. </span></p><p> </p><p><span style="font-size: 15px">While originally of mostly fundamental interest, the effect has in recent years been used to define the standard for what we mean by electrical resistance and could soon be employed to define the kilogram as well. </span></p><p> </p><p> </p><p><img src="http://www.messagetoeagle.com/images/landaulevels02.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p><span style="font-size: 15px"><em>Numerically Simulated Landau Level 1. Credit: University of Warwick</em></span></p><p></p><p><span style="font-size: 15px"> Professor Rudolf Roemer of the Department of Physics at the University of Warwick said: “This is an exciting step for us, we are really seeing for the first time individual quantum mechanical wave functions of electrons in real materials. </span></p><p> </p><p><span style="font-size: 15px"> “On the face of it this might seem far removed from everyday life. </span></p><p> </p><p><span style="font-size: 15px"> “However the question of what defines a kilogram is currently being debated, with the spacing between the rings of these Landau levels acting as a kind of marker for a universal weight. </span></p><p> </p><p><span style="font-size: 15px"> “So next time you measure out your sugar to bake a cake, you might unknowingly be making use of these quantum rings.” </span></p><p> </p><p><span style="font-size: 15px"> The research was published in the journal <a href="http://prl.aps.org/abstract/PRL/v109/i11/e116805" target="_blank">Physical Review Letters</a>. </span></p></blockquote><p></p>
[QUOTE="Opmmur, post: 58619, member: 13"] [SIZE=5]Physicists Have Directly Imaged Landau Levels For The First Time![/SIZE] [SIZE=4]Physicists have directly imaged Landau Levels – the quantum levels that determine electron behaviour in a strong magnetic field – for the first time since they were theoretically conceived of by Nobel prize winner Lev Landau in 1930. [/SIZE] [SIZE=4] Using scanning tunnelling spectroscopy - a spatially resolved probe that interacts directly with the electrons - scientists at institutions including the University of Warwick and Tohoku University have revealed the internal ring-like structure of these Landau Levels at the surface of a semiconductor. [/SIZE] [SIZE=4]The experimental challenge in the work was to have sufficient spatial resolution in order to overcome the intrinsic disorder in the material which usually only allows the observation of smeared out “drift” states. [/SIZE] [IMG]http://www.messagetoeagle.com/images/landaulevels01.jpg[/IMG] [I]This shows experimentally measured Landau Level 1. Credit: University of Warwick[/I] [SIZE=4]The images clearly show that Landau was right when he predicted that, in a clean system, the electrons would take on the form of concentric rings, the number of which increase according to their energy level. [/SIZE] [SIZE=4][/SIZE] [SIZE=4] This simple counting behaviour forms the basis of the so-called quantum Hall effect. [/SIZE] [SIZE=4]While originally of mostly fundamental interest, the effect has in recent years been used to define the standard for what we mean by electrical resistance and could soon be employed to define the kilogram as well. [/SIZE] [IMG]http://www.messagetoeagle.com/images/landaulevels02.jpg[/IMG] [SIZE=4][I]Numerically Simulated Landau Level 1. Credit: University of Warwick[/I][/SIZE] [SIZE=4] Professor Rudolf Roemer of the Department of Physics at the University of Warwick said: “This is an exciting step for us, we are really seeing for the first time individual quantum mechanical wave functions of electrons in real materials. [/SIZE] [SIZE=4] “On the face of it this might seem far removed from everyday life. [/SIZE] [SIZE=4] “However the question of what defines a kilogram is currently being debated, with the spacing between the rings of these Landau levels acting as a kind of marker for a universal weight. [/SIZE] [SIZE=4] “So next time you measure out your sugar to bake a cake, you might unknowingly be making use of these quantum rings.” [/SIZE] [SIZE=4] The research was published in the journal [URL='http://prl.aps.org/abstract/PRL/v109/i11/e116805']Physical Review Letters[/URL]. [/SIZE] [/QUOTE]
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