Výsledky vyhledávání - "Zhou, Qunfei"

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Analytical Theory of Near-Field Electrostatic Effects in Two-Dimensional Materials and van der Waals Heterojunctions

Autor: Zhou, Qunfei, Kotiuga, Michele, Darancet, Pierre

We derive and validate a quantitative analytical model of the near-field electrostatic effects in the vicinity (>=3\AA) of two-dimensional (2D) materials. In solving the Poisson equation of a near-planar point charge ansatz for the electronic density

Externí odkaz: http://arxiv.org/abs/2205.04606

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A Review of Sc-containing 'Scandate' Thermionic Cathodes

Autor: Seif, Mujan N., Zhou, Qunfei, Liu, Xiaotao, Balk, T. John, Beck, Matthew J.

Although thermionic emission has been studied for more than 100 years, recent interest in novel electron devices for military and civilian use has led to a surge in demand for cathodes with enhanced emission properties (e.g. higher current density, m

Externí odkaz: http://arxiv.org/abs/2202.04745

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Engineering the Electronic Structure of Two-Dimensional Materials with Near-Field Electrostatic Effects of Self-Assembled Organic Layers

Autor: Zhou, Qunfei, Anaclet, Bukuru, Steiner, Trevor, Kotiuga, Michele, Darancet, Pierre

We compute the electronic structure of two-dimensional (2D) materials decorated with self-assembled organic monolayers using density functional theory. We find that 2D materials are strongly impacted by near-field electrostatic effects resulting from

Externí odkaz: http://arxiv.org/abs/2109.09990

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Range-Separated Hybrid Functionals for Mixed-Dimensional Heterojunctions: Application to Phthalocyanines/MoS2

Autor: Zhou, Qunfei, Liu, Zhen-Fei, Marks, Tobin J., Darancet, Pierre

We analyze the electronic structure and level alignment of transition-metal phthalocyanine (MPc) molecules adsorbed on two-dimensional MoS$_2$ employing density functional theory (DFT) calculations. We develop a procedure for multi-objective optimal

Externí odkaz: http://arxiv.org/abs/2107.08516

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Non-Abelian Stokes theorem and quantized Berry flux

Autor: Tyner, Alexander C., Sur, Shouvik, Zhou, Qunfei, Puggioni, Danilo, Darancet, Pierre, Rondinelli, James M., Goswami, Pallab

Band topology of anomalous quantum Hall insulators can be precisely addressed by computing Chern numbers of constituent non-degenerate bands that describe quantized, Abelian Berry flux through two-dimensional Brillouin zone. Can Chern numbers be defi

Externí odkaz: http://arxiv.org/abs/2102.06207

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