Tropes

www.azonano.com 2015 00500.txt.txt

#New Method to Visualize Topological Insulators at the Nanoscale Using Large particle accelerator Scientists trying to improve the semiconductors that power our electronic devices have focused on a technology called spintronics as one especially promising area of research. Unlike conventional devices that use electronscharge to create power, spintronic devices use electronsspin. The technology is used already in computer hard drives and many other applications and scientists believe it could eventually be used for quantum computers, a new generation of machines that use quantum mechanics to solve complex problems with extraordinary speed. Emerging research has shown that one key to greatly improving performance in spintronics could be a class of materials called topological insulators. Unlike ordinary materials that are either insulators or conductors topological insulators function as both simultaneously on the inside, they are insulators but on their exteriors, they conduct electricity. But topological insulators have certain defects that have limited so far their use in practical applications, and because they are so tiny, scientists have so far been unable to fully understand how the defects impact their functionality. The UCLA researchers have overcome that challenge with a new method to visualize topological insulators at the nanoscale. An article highlighting the research, which was led by which Louis Bouchard, assistant professor of chemistry and biochemistry, and Dimitrios Koumoulis, a UCLA postdoctoral scholar, was published online in the Proceedings of the National Academy of Sciences. The new method is the first use of betaetected nuclear magnetic resonance to study the effects of these defects on the properties of topological insulators. The technique involves aiming a highly focused stream of ions at the topological insulator. To generate that beam of ions, the researchers used a large particle accelerator called a cyclotron, which accelerates protons through a spiral path inside the machine and forces them to collide with a target made of the chemical element tantalum. This collision produces lithium-8 atoms which are ionized and slowed down to a desired energy level before they are implanted in the topological insulators. In betaetected nuclear magnetic resonance, ions (in this case, the ionized lithium-8 atoms) of various energies are implanted in the material of interest (the topological insulator) to generate signals from the material layers of interest. Bouchard said the method is suited particularly well for probing regions near the surfaces and interfaces of different materials. In the UCLA research, the high sensitivity of the betaetected nuclear magnetic resonance technique and its ability to probe materials allowed the scientists to eethe impacts of the defects in the topological insulators by viewing the electronic and magnetic properties beneath the surface of the material. The researchers used the large TRIUMF cyclotron in Vancouver, British columbia. Co-authors of the PNAS research were Danny King, formerly a UCLA graduate student in chemistry and biochemistry; Kang L. Wang, a UCLA professor of electrical engineering; Liang He, formerly a postdoctoral scholar in Wang lab; Xufeng Kou, formerly a graduate student in Wang lab; Gerald Morris and Masrur Hossain at TRIUMF; Dong Wang of the University of British columbia; Gregory Fiete, a professor at the University of Texas, Austin; and Mercouri Kanatzidis, a professor at Northwestern University. Source: http://www. ucla. edu h

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