A5006877745- Topological Materials and Phenomena
- 2D Materials and Applications
- Graphene research and applications
- Cold Atom Physics and Bose-Einstein Condensates
- Boron and Carbon Nanomaterials Research
- Quantum and electron transport phenomena
- Advanced Condensed Matter Physics
- Quantum Mechanics and Non-Hermitian Physics
- Quantum many-body systems
- Physics of Superconductivity and Magnetism
- Planarian Biology and Electrostimulation
- Advanced Sensor and Energy Harvesting Materials
- Liquid Crystal Research Advancements
- EEG and Brain-Computer Interfaces
- Heusler alloys: electronic and magnetic properties
- Advanced Fiber Laser Technologies
- Quantum chaos and dynamical systems
- advanced mathematical theories
- Tactile and Sensory Interactions
- Photonic and Optical Devices
- Quantum, superfluid, helium dynamics
- Mathematical Dynamics and Fractals
- Nonlinear Photonic Systems
- Iron-based superconductors research
- Topological and Geometric Data Analysis
Lawrence Berkeley National Laboratory
2023-2024
University of California, Berkeley
2020-2024
University of Illinois Urbana-Champaign
2015
Pohang University of Science and Technology
2014-2015
Significance Conventional electroencephalogram (EEG) recording systems, particularly the hardware components that form physical interfaces to head, have inherent drawbacks limit widespread use of continuous EEG measurements for medical diagnostics, sleep monitoring, and cognitive control. Here we introduce soft electronic constructs designed intimately conform complex surface topology auricle mastoid, provide long-term, high-fidelity data. Systematic studies reveal key aspects extreme levels...
Non‐invasive, biomedical devices have the potential to provide important, quantitative data for assessment of skin diseases and wound healing. Traditional methods either rely on qualitative visual tactile judgments a professional and/or obtained using instrumentation with forms that do not readily allow intimate integration sensitive near site. Here, an electronic sensor platform can softly reversibly laminate perilesionally at wounds highly accurate, relevance management surgical healing is...
Density functional theory calculations are carried out to study the electronic and topological properties of $M$P$X_3$ ($M$ = Mn, Fe, Co, Ni, $X$ S, Se) monolayers in ferromagnetic (FM) metastable magnetic state. We find that FM MnPSe$_3$ host semimetal signatures gapped when spin-orbit coupling (SOC) is included. These findings supported by explicit Berry curvature Chern number. The choice Hubbard-$U$ parameter describe $d$-electrons thoroughly discussed, as well influence using a...
The realization of interacting topological states matter such as fractional Chern insulators (FCIs) in cold atom systems has recently come within experimental reach due to the engineering optical lattices with synthetic gauge fields providing required band structures. However, detecting their occurrence might prove difficult since transport measurements akin those solid state are challenging perform setups and alternatives have be found. We show that for a $\ensuremath{\nu}=1/2$ FCI realized...
When subjected to quasiperiodic driving protocols, superconducting systems have been found harbor robust time-quasiperiodic Majorana modes, extending the concept beyond static and Floquet systems.However, presence of incommensurate frequencies results in dense energy spectra, rendering conventional methods defining topological invariants based on band structure inadequate.In this work, we introduce a real-space invariant capable identifying timequasiperiodic Majoranas by leveraging system's...
We find a class of Floquet topological phases exhibiting gap-dependent classifications in quantum systems with dynamical space-time symmetry and an antisymmetry. This is contrast to all existing protected by static symmetries, where the classification across quasienergy gaps characterized same Abelian group. demonstrate this phenomenon using frequency-domain formulation time-dependent Hamiltonian. Moreover, we provide interpretation resulting frequency lattice decoration represented color...
The possibility of selecting magnetic space groups by orienting the magnetization direction or tuning orders offers a vast playground for engineering symmetry-protected topological phases in materials. In this work, we study how selective symmetry and magnetism can influence control resulting topology two-dimensional system, illustrate such procedure ferromagnetic monolayer ${\mathrm{MnPSe}}_{3}$. Density functional theory calculations reveal accidental semimetallic (SM) phase out-of-plane...
We present a systematic framework for Floquet prethermalization under strong resonant driving, emphasizing the pivotal role of dynamical space-time symmetries. Our approach demonstrates how symmetries map onto projective static symmetry group prethermal Hamiltonian governing regime. introduce techniques detecting through time evolution local observables, facilitating detailed analysis micromotion within each period and surpassing limitations conventional stroboscopic dynamics. To implement...
When subjected to quasiperiodic driving protocols, superconducting systems have been found harbor robust time-quasiperiodic Majorana modes, extending the concept beyond static and Floquet systems. However, presence of incommensurate frequencies results in dense energy spectra, rendering conventional methods defining topological invariants based on band structure inadequate. In this work, we introduce a real-space invariant capable identifying Majoranas by leveraging system's spectral...
We consider nontrivial topological phases in Floquet systems using unitary loops and stroboscopic evolutions under a static Hamiltonian $H_F$ the presence of dynamical space-time symmetries $G$. While latter has been subject out-of-equilibrium classifications that extend ten-fold way with additional crystalline to periodically driven systems, we explore anomalous zero modes arise from coexistence symmetry $M$ antisymmetry $A$ $G$, classify them frequency-domain formulation. Moreover, provide...
The possibility of selecting magnetic space groups by orienting the magnetization direction or tuning orders offers a vast playground for engineering symmetry protected topological phases in materials. In this work, we study how selective and magnetism can influence control resulting topology 2D system, illustrate such procedure ferromagnetic monolayer MnPSe$_3$. Density functional theory calculations reveals symmetry-protected accidental semimetalic (SM) phase out-of-plane which becomes an...
Several optical experiments have shown that in magnetic materials the principal axes of response tensors can rotate a field. Here we offer microscopic explanation this effect, and propose closely related DC transport phenomenon -- an off-diagonal \emph{symmetric} conductivity linear field, which refer to as magneto-conductivity (LMC). Although LMC has same functional dependence on field Hall its origin is fundamentally different: requires time-reversal symmetry be broken even before applied,...
Chiral Majorana one-dimensional modes have been proposed as they key component for topological quantum computing. In this study, we explore their potential realization hinge in higher-order superconductors. To create such phases, engineer a sign-changing, time-reversal symmetry-breaking mass term through an ensemble of magnetic impurities on the surface sphere. The magnetization arises from competition between external field and Ruderman-Kittel-Kasuya-Yosida (RKKY) interaction among...
Density functional theory calculations are carried out to study the electronic and topological properties of $M$P$X_3$ ($M$ = Mn, Fe, Co, Ni, $X$ S, Se) monolayers in ferromagnetic (FM) metastable magnetic state. We find that FM MnPSe$_3$ host semimetal signatures gapped when spin-orbit coupling (SOC) is included. These findings supported by explicit Berry curvature Chern number. The choice Hubbard-$U$ parameter describe $d$-electrons thoroughly discussed, as well influence using a...