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Add to Calendar 11/30/2018 1:00 pm 11/30/2018 America/Chicago Condensed Matter Seminar: "Tuning the electronic properties of topological materials by strain" DESCRIPTION:

A promising pathway for controlling the properties of materials is strain. Strain can be used to tune the interatomic lattice spacing and induce an accompanying change in the electronic structure. In superconductors, for example, strain has been used to enhance the superconducting critical temperature or to induce resistivity anisotropy. In topological Dirac materials, theoretical studies indicate that both tensile and compressive strain can profoundly alter the characteristics of the topological surface states. In particular Dirac systems, strain can induce giant pseudomagnetic fields and flat bands which may be used to induce strong correlations. In this talk I discuss the effects of strain on two distinct classes of topological materials: topological insulators (TIs) and topological crystalline insulators (TCIs). Using low temperature scanning tunneling microscopy, Landau level spectroscopy, and quasiparticle interference we will map out the effects of 1D and 2D strain on Bi2Te3 and SnTe, and show how strain can have unique effects on the band structure of TIs and TCIs.   

\n\nSPEAKER:

Vidya Madhavan, University of Illinois at Urbana-Champaign

190 ESB

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Condensed Matter Seminar: "Tuning the electronic properties of topological materials by strain"

Speaker Vidya Madhavan, University of Illinois at Urbana-Champaign
Date: 11/30/2018
Time: 1 p.m.
Location:

190 ESB

Sponsor:

Physics - Condensed Matter

Event Type: Seminar/Symposium
 

A promising pathway for controlling the properties of materials is strain. Strain can be used to tune the interatomic lattice spacing and induce an accompanying change in the electronic structure. In superconductors, for example, strain has been used to enhance the superconducting critical temperature or to induce resistivity anisotropy. In topological Dirac materials, theoretical studies indicate that both tensile and compressive strain can profoundly alter the characteristics of the topological surface states. In particular Dirac systems, strain can induce giant pseudomagnetic fields and flat bands which may be used to induce strong correlations. In this talk I discuss the effects of strain on two distinct classes of topological materials: topological insulators (TIs) and topological crystalline insulators (TCIs). Using low temperature scanning tunneling microscopy, Landau level spectroscopy, and quasiparticle interference we will map out the effects of 1D and 2D strain on Bi2Te3 and SnTe, and show how strain can have unique effects on the band structure of TIs and TCIs.   

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