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						<h1 itemprop="headline">Specialized iNANO lecture: LT/mK-STM study on Bi2Se3 and CuxBi2Se3 with W and Nb tips</h1>
						
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														Friday 12  February 2016,
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														&nbsp;at 11:15 -  12:00
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														<p>iNANO meeting room 1590-213, Gustav Wieds Vej 14, 8000 Aarhus C</p>
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                                Research associate Rami Dana
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									<table cellpadding="2" cellspacing="2" class="contenttable"> <tbody> <tr> <td>&nbsp;</td> <td> <h2><a href="https://umdphysics.umd.edu/people/research-scientists-and-postdocs/item/111-rdana.html" target="_self" data-htmlarea-external="1">Research associate Rami Dana, University of Maryland and the Laboratory for Physical Sciences (LPS</a>)</h2> <p><strong>LT/mK-STM study on Bi2Se3 and CuxBi2Se3 with W and Nb tips</strong></p> <p>The search for Majorana Fermions (MF) in condense matter physics was getting a lot of attention in the last ~15 years. During this time different theoretical proposals suggested many experimental setups to identify these states (for a review see [1, 2]). Some of the ideas pointed towards finding a zero-bias conductance peak (ZBCP) in topological insulator - superconductor heterostructures, with and without the application of a magnetic field. At LPS we were using a homemade 4K and mK-STM [3] to look at the topological insulator Bi<sub>2</sub>Se<sub>3 </sub>and the topological superconductor Cu<sub>x</sub>Bi<sub>2</sub>Se<sub>3</sub> using both normal W and superconducting Nb tips [4]. Our results include data from all four possible junctions. In this talk I will be discussing; gap and sub-gap features arising when Nb islands are grown on Bi<sub>2</sub>Se<sub>3</sub>, proximity induced superconductivity on the surface of Bi<sub>2</sub>Se<sub>3</sub> with Nb tip, varying superconducting gaps on Cu<sub>0.2</sub>Bi<sub>2</sub>Se<sub>3</sub> and sub-gap states/ZBCP on the surface of Cu<sub>0.2</sub>Bi<sub>2</sub>Se<sub>3 </sub>with applied magnetic field. Our SIS junctions display super-current peaks that are not bound to zero bias. Instead, they decay away from zero with extra peaks at finite voltage. I will explain this behavior by Cooper-pair current through ultra-small Josephson junctions and loss of energy to modes of the environment, both predicted by the P(E) theory [5]. I will also show microwave response of super-current in Nb-Nb junction and suggest its possible application in my search for (MF).</p> <p><strong>References</strong></p> <ol> <li>C.W.J. Beenakker, Search for Majorans Fermions in Superconductors, Annu. Rev. Condens. Matter Phys. 4, 113 2013</li> <li>S. R. Elliott and M. Franz, Colloquium: Majorana fermions in nuclear, particle, and solid-state physics, Rev. Mod. Phys., 87 (1), 137 2015</li> <li>Anita Roychowdhury, M. A. Gubrud, <strong>R. Dana</strong>, J. R. Anderson, C. J. Lobb, F. C. Wellstood, and M. Dreyer, A 30 mK, 13.5 T scanning tunneling microscope with two independent tips, Rev. Sci. Inst. 85, 043706 2014</li> <li>A. Roychowdhury, <strong>R. Dana</strong>, M. Dreyer, J. R. Anderson, C. J. Lobb and F. C. Wellstood, Plasma etching of superconducting Niobium tips for scanning tunneling microscopy, J. Appl. Phys. 116, 014308 2014</li> <li>G.-L. Ingold, H. Grabert, U. Eberhardt, Cooper-pair current through ultra-small Josephson junctions, PRB 50(1), 395 1994</li> </ol></td> </tr> <tr> <td></td> <td><strong>Host:</strong> Associate professor Mingdong Dong, Interdisciplinary Nanoscience Center, Aarhus University</td> </tr> </tbody> </table>
								
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