TODAY: Shivam Sharma, 28-Feb-2023, 12:20pm Central
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Ellad Tadmor
Feb 28, 2023, 8:04:26 AM2/28/23
to aem-solid...@umn.edu
AEM Mechanics Research Seminar
TODAY, Tuesday 28-Feb-2023, 12:20pm Central
Mr. Shivam Sharma
Department of Aerospace Engineering and Mechanics, University of Minnesota
Title: Strong correlation in quasi-one-dimensional matter
Abstract: In this talk, I will discuss quasi-one-dimensional (1D) materials with helical symmetries, examples of which include nanotubes, nanowires and nanoribbons. Emergent forms of such matter are likely to be associated with strongly correlated and collective electronic effects such as superconductivity, ferromagnetism, Wigner crystallization and Mott insulating states. Due to the morphology of these materials, they are expected to exhibit these properties in manners that are significantly different from bulk phase materials. Moreover, the 1D geometry of these structures offer excellent opportunities for incorporating them as materials in novel quantum, electromagnetic and photonic device applications. Broadly, many of the exotic electronic properties featured by these materials are linked to dispersion less electronic states (flat bands) and a corresponding singular peak in the electronic density of states (Van Hove singularity). In this work, we use symmetry adapted first principles calculations and tight-binding models to investigate the electromechanical properties of a set of realistic 1D materials featuring flat bands. Specifically, two prototypical nanotube and nanoribbon systems, based on Kagome and hexagonal lattice geometries of carbon and phosphorus, are studied. We show that these nanomaterials host flat bands with quadratic band crossing and that their electronic structures can be classified based on the type of singularities in their Bloch wavefunctions. We also show how mechanical deformations can lead to electronic phase transitions in these structures.
For more information, visit the AEM Mechanics Research Seminar website:
In-person: Room 25, Mechanical Engineering Building, University of Minnesota
Online: Webinar registration link
Department of Aerospace Engineering and Mechanics, University of Minnesota
Title: Strong correlation in quasi-one-dimensional matter
Abstract: In this talk, I will discuss quasi-one-dimensional (1D) materials with helical symmetries, examples of which include nanotubes, nanowires and nanoribbons. Emergent forms of such matter are likely to be associated with strongly correlated and collective electronic effects such as superconductivity, ferromagnetism, Wigner crystallization and Mott insulating states. Due to the morphology of these materials, they are expected to exhibit these properties in manners that are significantly different from bulk phase materials. Moreover, the 1D geometry of these structures offer excellent opportunities for incorporating them as materials in novel quantum, electromagnetic and photonic device applications. Broadly, many of the exotic electronic properties featured by these materials are linked to dispersion less electronic states (flat bands) and a corresponding singular peak in the electronic density of states (Van Hove singularity). In this work, we use symmetry adapted first principles calculations and tight-binding models to investigate the electromechanical properties of a set of realistic 1D materials featuring flat bands. Specifically, two prototypical nanotube and nanoribbon systems, based on Kagome and hexagonal lattice geometries of carbon and phosphorus, are studied. We show that these nanomaterials host flat bands with quadratic band crossing and that their electronic structures can be classified based on the type of singularities in their Bloch wavefunctions. We also show how mechanical deformations can lead to electronic phase transitions in these structures.
For more information, visit the AEM Mechanics Research Seminar website:
_________________________________________________________________
Ellad B. Tadmor, Professor
Department of Aerospace Engineering and Mechanics
University of Minnesota
107 Akerman Hall, 110 Union St SE
Minneapolis, MN 55455, USA
tel: 612-625-6642
fax: 612-626-1558
web: Tadmor Website | Modeling Materials Book Website
_________________________________________________________________
Ellad B. Tadmor, Professor
Department of Aerospace Engineering and Mechanics
University of Minnesota
107 Akerman Hall, 110 Union St SE
Minneapolis, MN 55455, USA
tel: 612-625-6642
fax: 612-626-1558
web: Tadmor Website | Modeling Materials Book Website
_________________________________________________________________
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