News

[Sunje Kim and Bohm-Jung Yang] Measurement of the quantum geometric tensor in solids (published in N... Nov 26, 2024 l Hit 557

Measurement of the quantum geometric tensor in solids Understanding the geometric properties of quantum states and their implications in fundamental physical phenomena is a fundamental aspect of contemporary physics. The quantum geometric tensor is a central physical object in this regard, encoding complete information...

[Prof. Seung-Sup B. Lee] Emergent Properties of the Periodic Anderson Model: A High-Resolution, Real... Nov 11, 2024 l Hit 355

Emergent Properties of the Periodic Anderson Model: A High-Resolution, Real-Frequency Study of Heavy-Fermion Quantum Criticality Andreas Gleis, Seung-Sup B. Lee, Gabriel Kotliar, and Jan von Delft Phys. Rev. X 14, 041036 (2024) (Publication date: 7 November 2024) For more than 20 years, quantum criticality in heav...

Rasoul Ghadimi, Chiranjit Mondal, Bohm-Jung Yang] Quantum valley Hall effect without Berry curvatur ... Nov 8, 2024 l Hit 341

Quantum valley Hall effect without Berry curvature The quantum valley Hall effect (QVHE) is characterized by the valley Chern number (VCN) in a way that one-dimensional (1D) chiral metallic states are guaranteed to appear at the domain walls (DW) between two domains with opposite VCN for a given valley. Although in the...

[Seung-Hoon Oh & Kyungwon An] Thresholdless coherence in a superradiant laser (published in Light: S... Sep 6, 2024 l Hit 357

Lasing threshold in the conventional lasers is the minimum input power required to initiate laser oscillation. It has been widely accepted that the conventional laser threshold occurring around a unity intracavity photon number can be eliminated in the input-output curve by making the so-called β parameter approac...

[Gyungmin Cho, Dohun Km] Machine learning on quantum experimental data toward solving quantum many-b... Sep 2, 2024 l Hit 378

Quantum computers hold the potential to solve challenging problems in fields such as chemistry and physics, but the lack of quantum error correction currently limits the types of quantum algorithms that can be implemented. To circumvent this limitation, a hybrid approach has been introduced, where classical computers a...

[Y. S. Teo, S. U. Shringarpure, H. Jeong] Evidence-Based Certification of Quantum Dimensions (publis... Aug 27, 2024 l Hit 296

Evidence-Based Certification of Quantum Dimensions Identifying a reasonably small Hilbert space that completely describes an unknown quantum state is crucial for efficient quantum information processing. We introduce a general dimension-certification protocol for both discrete and continuous variables that is fu...

[Yungi Jeong and Joonho Jang] Interplay of valley, layer and band topology towards interacting quant... Aug 15, 2024 l Hit 307

Interplay of valley, layer and band topology towards interacting quantum phases in moiré bilayer graphene In Bernal-stacked bilayer graphene (BBG), the Landau levels give rise to an intimate connection between valley and layer degrees of freedom. Adding a moiré superlattice potential enriches the BBG phys...

[Saegyeol Jung and Changyoung Kim] Spontaneous breaking of mirror symmetry in a cuprate beyond criti... Aug 2, 2024 l Hit 400

Spontaneous breaking of mirror symmetry in a cuprate beyond critical doping Identifying ordered phases and their underlying symmetries in materials that exhibit high-temperature superconductivity is an important step towards understanding the mechanism of that phenomenon. Indeed, the critical behaviour related to phase...

[Pyeongjae Park, Junghyun Kim, Je-Geun Park] Direct Observation and Analysis of Low-Energy Magnons w... Jul 30, 2024 l Hit 531

Direct Observation and Analysis of Low-Energy Magnons with Raman Spectroscopy in Atomically Thin NiPS3 Van der Waals (vdW) magnets have rapidly emerged as a fertile playground for novel fundamental physics and exciting applications. Despite the impressive developments over the past few years, technical limitations pose...

[Quantum Gas Lab] Universal Kibble-Zurek scaling in an atomic Fermi superfluid (published in Nature ... Jul 30, 2024 l Hit 574

Universal Kibble-Zurek scaling in an atomic Fermi superfluid The Kibble–Zurek mechanism is a theoretical framework that describes the formation and scaling of topological defects in symmetry-breaking phase transitions. It was originally conceptualized for superfluid helium. The theory predicts that the numb...