Bo Gyu Jang

Universal Signature of Hundness and Its Quantification

Dongwook Kim, Ina Park, Bo Gyu Jang, Ji Hoon Shim

Hund's coupling $J$ induces fundamentally different correlation effects from Hubbard $U$. This leads to a violation of the Brinkman--Rice scenario and the emergence of a Janus-faced phase owing to its low-energy effectiveness, in which band renormalization is confined below a characteristic energy …

Interaction-driven flat band and charge order in Fe 5 GeTe 2

Qiang Gao, Gabriele Berruto, Khanh Duy Nguyen, Chaowei Hu et autres

Flat electronic bands enable fascinating emergent phenomena such as superconductivity and charge orders. A prevailing approach to realizing flat bands is to engineer lattice geometric constraints in twisted or kagome-like materials. An alternative approach is to utilize purely electronic-interaction-driven flat bands, yet …

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Abinitio study of two-dimensional heavy-fermion CeTX family (T=C, Si, Ge; X=Cl, Br, I)

Seulbi Kim, Sejoong Kim, Bo Gyu Jang

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A Design Strategy for Durable Anionic Redox via Fluorine‐Induced Electronic Structure Modulation in In Situ Formed Disordered Phases (Adv. Mater. 35/2026)

Wontae Lee, Yun Seong Byeon, Kyeongkeun Kwon, Jae‐Uk Kim et autres

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Correlation-driven tunability of altermagnetism in RuO$_2$

Ina Park, Dongwook Kim, Inho Lee, Jisook Hong et autres

RuO$_2$ has been regarded as a prototypical candidate for metallic altermagnet, offering a potential platform for high-speed and high-efficiency spintronics. However, the magnetic ground state of RuO$_2$ remains a topic of active debate due to conflicting experimental reports. In this work, we …

Correlation-driven tunability of altermagnetism in RuO$_2$

Ina Park, Dongwook Kim, Inho Lee, Jisook Hong et autres

RuO$_2$ has been regarded as a prototypical candidate for metallic altermagnet, offering a potential platform for high-speed and high-efficiency spintronics. However, the magnetic ground state of RuO$_2$ remains a topic of active debate due to conflicting experimental reports. In this work, we …

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Ag doping effect in electrical and thermal transport properties of type I Ba8Al16Si30 clathrate compounds

Pooja Rawat, Anil Kumar, Aanchal Sethi, Bo Gyu Jang et autres

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Coexisting kagome and heavy fermion flat bands in YbCr6Ge6

Hanoh Lee, Churlhi Lyi, Taehee Lee, H. Na et autres

Flat bands, electronic states with nearly dispersionless energy-momentum structure, provide fertile ground for unconventional quantum phases. Recent observations of flat bands at the Fermi level in kagome metals open the possibility of unifying topology and correlation-driven heavy-fermion physics. Here we show that …

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Coexisting kagome and heavy fermion flat bands in YbCr6Ge6

Hanoh Lee, Churlhi Lyi, Taehee Lee, H. Na et autres

Flat bands, electronic states with nearly dispersionless energy-momentum structure, provide fertile ground for unconventional quantum phases. Recent observations of flat bands at the Fermi level in kagome metals open the possibility of unifying topology and correlation-driven heavy-fermion physics. Here we show that …

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Dichotomy of flat bands in the van der Waals ferromagnet Fe 5 GeTe 2

Han Wu, J. C. A. Huang, Chaowei Hu, Lei Chen et autres

Quantum materials with bands of narrow bandwidth near the Fermi level represent a promising platform for exploring a diverse range of fascinating physical phenomena, as the high density of states within the small energy window often enables the emergence of many-body physics. …

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High Photovoltaic Efficiency in Bulk-Stacked One-Dimensional GeSe$_{2}$ van der Waals Crystal

Seoung-Hun Kang, Youngjae Kim, Bo Gyu Jang, Sejoong Kim

Germanium diselenide (GeSe$_{2}$) has recently attracted substantial interest as a rare example of one-dimensional (1D) van der Waals material. Here, we investigate the photovoltaic potential of bulk-stacked GeSe$_{2}$ chains using first-principles calculations within the $GW0$ approximation and the Bethe-Salpeter equation (BSE) to …

High Photovoltaic Efficiency in Bulk-Stacked One-Dimensional GeSe$_{2}$ van der Waals Crystal

Seoung-Hun Kang, Youngjae Kim, Bo Gyu Jang, Sejoong Kim

Germanium diselenide (GeSe$_{2}$) has recently attracted substantial interest as a rare example of one-dimensional (1D) van der Waals material. Here, we investigate the photovoltaic potential of bulk-stacked GeSe$_{2}$ chains using first-principles calculations within the $GW0$ approximation and the Bethe-Salpeter equation (BSE) to …

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