Condensed Matter Seminar

Heterogeneous Integration of Semiconductors and Emerging Materials for DOE initiatives

Abstract: Advances in nanoscience have overcome materials compatibility issues and delivered novel functionalities. The progress has come with various nanomaterials, such as two-dimensional (2D) materials, nanowires, nanoparticles, and other hierarchical materials. There is no silver bullet as a universal solution for various applications. Therefore, heterostructuring to fabricate multi-dimensional or hybrid architectures, in which individual constituents’ properties are designed, is a common and promising way.

Tunneling photocurrent spectroscopy of in-situ twisted 2D materials with the optical quantum twisting microscope

Abstract: Quantum twisting microscope (QTM) is a new and powerful platform to study in-situ twistronics and momentum-resolved band structure imaging of 2D materials. Further combining it with light allows probing the optical and optoelectronic properties of two layers of 2D materials stacked on top of each other with a tunable twist angle. In this talk, I will present the development of an optical quantum twisting microscope which is equipped with both vis-NIR lasers and home built Fourier transform infrared spectrometer.

Search for Flatbands and Magnetism in Layered Quasi-2D f-Electron Materials

Abstract: Quantum materials give us unprecedented access to a rich tapestry of complex properties that when harnessed allow us to overcome the intrinsic limitations of classical sensing, computing, and storage technologies. The underexplored intersection of strong spin-orbit coupling, electron-electron correlation effects, and local f-electron states provides fertile ground for discovery and the development of next-generation multifunctional quantum technologies. However, due to the vastness of the geometrical and compositional phase space we encounter an exponential wall.

Inorganic and Organic-Inorganic Semiconductors from Large-Scale Hybrid DFT

Abstract: Semiconductor materials play essential roles in a host of technologies including computation, photovoltaics, light emission, and spin transport. This talk focuses on first-principles simulations of the structure, stability and electronic properties of novel semiconductor materials, especially hybrid organic-inorganic perovskites and multinary chalcogenide materials.

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