Colloquium - Shengbai Zhang (Rensselaer Polytechnic Institute) - In Pursuit of Novel Two-Dimensional Electronic Structures By First-Principles Theory

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November 4, 2014
4:00PM - 5:00PM
Location
1080 Physics Research Building - Smith Seminar Room - reception at 3:45 pm in the Atrium

Date Range
Add to Calendar 2014-11-04 16:00:00 2014-11-04 17:00:00 Colloquium - Shengbai Zhang (Rensselaer Polytechnic Institute) - In Pursuit of Novel Two-Dimensional Electronic Structures By First-Principles Theory

First-principles modeling and simulation are a bridge between theory and experiment. This is especially true in pursue of two-dimensional (2D) materials with normal physical properties. In this talk, I will discuss how to advance the current knowledge of topological insulators for practical applications, in particular, how to design topological edge states with large bulk band gap [1,2] and what silent physics a realistic topological insulator and normal insulator interface may offer. Next, to engage our discussion, I will present some calculated 2D systems and bulk assembly of the 2D systems. My examples include transition metal honeycomb [3], magnetically enhanced electron-phonon coupling [4], and carbon Kagome lattice from graphene, utilizing orbital frustration for better optoelectronic properties [5]. Both fundamental theories and experiments are called upon to deepen our understanding of the simulated results and to experimentally test the validity of the proposed systems.

[1] Y. Li, et al., Phys. Rev. Lett. 109, 206802 (2012).

[2] Y. Li, et al., Phys. Rev. B 87, 245127 (2013).

[3] L. Li, Yet al., Nano Letters 13, 4671 (2013).

[4] S.-Y. Xie, et al., Phys. Rev. B 90, 035447 (2014).

[5] Y. Chen, et al., Phys. Rev. Lett. 113, 085501 (2014) (Editor’s Suggestion).

1080 Physics Research Building - Smith Seminar Room - reception at 3:45 pm in the Atrium Department of Physics physics@osu.edu America/New_York public
Description

First-principles modeling and simulation are a bridge between theory and experiment. This is especially true in pursue of two-dimensional (2D) materials with normal physical properties. In this talk, I will discuss how to advance the current knowledge of topological insulators for practical applications, in particular, how to design topological edge states with large bulk band gap [1,2] and what silent physics a realistic topological insulator and normal insulator interface may offer. Next, to engage our discussion, I will present some calculated 2D systems and bulk assembly of the 2D systems. My examples include transition metal honeycomb [3], magnetically enhanced electron-phonon coupling [4], and carbon Kagome lattice from graphene, utilizing orbital frustration for better optoelectronic properties [5]. Both fundamental theories and experiments are called upon to deepen our understanding of the simulated results and to experimentally test the validity of the proposed systems.

[1] Y. Li, et al., Phys. Rev. Lett. 109, 206802 (2012).

[2] Y. Li, et al., Phys. Rev. B 87, 245127 (2013).

[3] L. Li, Yet al., Nano Letters 13, 4671 (2013).

[4] S.-Y. Xie, et al., Phys. Rev. B 90, 035447 (2014).

[5] Y. Chen, et al., Phys. Rev. Lett. 113, 085501 (2014) (Editor’s Suggestion).