8 papers
Enhancement of exciton radius near a band-gap closing through quantum geometry
Jin-Hyung Choi, Sang-Hoon Han, Young-Kwon Han +3
Exciton engineering traditionally focuses on modifying semiclassical material properties, such as the effective mass and dielectric screening, while largely overlooking the quantum…
Ultrafast Current Switching from Quantum Geometry in Semimetals
Youngjae Kim, Sejoong Kim, Jun-Won Rhim
Technological progress towards next-generation electronics critically relies on achieving faster switching with reduced energy consumption. Because device operation speeds are fund…
Klein tunneling in quantum geometric semimetals
Sang-Hoon Han, Jun-Won Rhim, Chang-geun Oh
Klein tunneling stands as a fundamental probe of relativistic quantum transport in two-dimensional materials. We investigate this phenomenon in quadratic band-touching systems, whe…
Topological Protection by Local Support Symmetry and Destructive Interference
Jun-Won Rhim, Jaeuk Seo, Seongjun Mo +3
Conventionally, symmetry-protected topological phases and band crossings are protected by global symmetries acting on the entire system. Here, we show that symmetries preserved onl…
Magnetic phase transitions driven by quantum geometry
Chang-geun Oh, Taisei Kitamura, Akito Daido +2
We explore how the quantum geometric properties of the Bloch wave function, characterized by the Hilbert-Schmidt quantum distance, impact magnetic phases in solid-state systems. To…
Enhancing van-Hove singularities in SrRuO films by vacancy engineerings
Moon Hyoung Lee, Hyungwoo Lee, Jun-Won Rhim
Flat bands, characterized by their localized electronic states and van Hove singularities, provide an ideal platform for exploring many-body physics. However, transition metal oxid…