Publications (33)
Application of the independent component analysis to the iKAGRA data
KAGRA Collaboration, T. Akutsu, M. Ando +244
We apply the independent component analysis (ICA) to the real data from a gravitational wave detector for the first time. Specifically we use the iKAGRA data taken in April 2016, a…
Ultrafast Terahertz Conductivity Probes of Topologically Enhanced Surface Transport Driven by Mid-Infrared Laser Pulses in BiSe
L. Luo, X. Yang, X. Liu +8
The recent discovery of topology-protected charge transport of ultimate thinness on surfaces of three-dimensional topological insulators (TIs) are breaking new ground in fundamenta…
3(111) Grain Boundaries Accelerate Hydrogen Insertion into Palladium Nanostructures
K. A. U. Madhushani, H. Park, H. Zhou +5
Grain boundaries (GBs) are frequently implicated as key defect structures facilitating metal hydride formation, yet their specific role remains poorly understood due to their struc…
Charge Density Wave Modulation in Superconducting BaPbO/BaBiO Superlattices
D. T. Harris, N. Cambell, C. Di +9
The isotropic, non-magnetic doped BaBiO superconductors maintain some similarities to high-Tc cuprates, while also providing a cleaner system for isolating charge density wave…
Discovery of Light-induced Metastable Martensitic Anomaly Controlled by Single-Cycle Terahertz Pulses
X. Yang, B. Song, C. Vaswani +9
We report on an ultrafast photoinduced phase transition with a strikingly long-lived Martensitic anomaly driven by above-threshold single-cycle terahertz (THz) pulses in NbSn.…
Quantum Coherence Tomography of Lightwave Controlled Superconductivity
L. Luo, M. Mootz, J. H. Kang +9
Lightwave periodic driving of nearly dissipation-less currents has recently emerged as a universal control concept for both superconducting (SC) and topological electronics applica…
Ultrafast Control of Excitonic Rashba Fine Structure by Phonon Coherences in a Metal Halide Perovskite CHNHPbI
Z. Liu, C. Vaswani, X. Yang +14
We discover hidden Rashba fine structure in CHNHPbI and demonstrate its quantum control by vibrational coherence through symmetry-selective vibronic (electron-phonon) c…
Measurement of the Entropy and Critical Temperature of a Strongly Interacting Fermi Gas
L. Luo, B. Clancy, J. Joseph +2
We report a model-independent measurement of the entropy, energy, and critical temperature of a degenerate, strongly interacting Fermi gas of atoms. The total energy is determined…
Femtosecond Population Inversion and Stimulated Emission of Dense Dirac Fermions in Graphene
T. Li, L. Luo, M. Hupalo +4
We show that strongly photoexcited graphene monolayers with 35fs pulses quasi-instantaneously build up a broadband, inverted Dirac fermion population. Optical gain emerges and dire…
Discovery of an Unconventional Quantum Echo by Interference of Higgs Coherence
C. Huang, M. Mootz, L. Luo +9
Nonlinearities in quantum systems are fundamentally characterized by the interplay of phase coherences, their interference, and state transition amplitudes. Yet the question of how…
Imaging-spectroscopy diagnosis of the giant sloshing spiral in the Virgo cluster with the Einstein Probe Follow-up X-ray Telescope
X. Zheng, S. Jia, C. Li +46
We performed deep X-ray observations of the Virgo cluster using the Einstein Probe Follow-up X-ray Telescope (EP-FXT) with a total exposure of 295 ks. Leveraging the large field of…
Observation of Anomalous Spin Segregation in a Trapped Fermi Gas
X. Du, L. Luo, B. Clancy +1
We report the observation of spin segregation, i.e., separation of spin density profiles, in a trapped ultracold Fermi gas of Li with a magnetically tunable scattering length c…
Quantum Enhanced Pauli Propagation
S. Majumder, J. R. Garrison, L. Luo +8
Accurately estimating observables on noisy quantum devices remains a central challenge for near-term quantum algorithms. While quantum error mitigation techniques can reduce noise-…
Visualizing heterogeneous dipole fields by terahertz light coupling in individual nano-junctions used in transmon qubits
R. H. J. Kim, J. M. Park, S. Haeuser +12
The fundamental challenge underlying superconducting quantum computing is to characterize heterogeneity and disorder in the underlying quantum circuits. These nonuniform distributi…
Discovery of Terahertz Second Harmonic Generation from Lightwave Acceleration of Symmetry--Breaking Nonlinear Supercurrents
C. Vaswani, C. Sundahl, M. Mootz +11
We report terahertz (THz) second harmonic generation (SHG) in superconductors (SC) with inversion symmetric equilibrium states that forbid even-order nonlinearities. Such SHG signa…
Random Numbers Certified by Bell's Theorem
S. Pironio, A. Acin, S. Massar +8
Randomness is a fundamental feature in nature and a valuable resource for applications ranging from cryptography and gambling to numerical simulation of physical and biological sys…
Coherent Transfer of Lattice Entropy via Extreme Nonlinear Phononics in Metal Halide Perovskites
Z. Liu, Y. Shi, T. Jiang +8
Entropy transfer in metal halide perovskites, characterized by significant lattice anharmonicity and low stiffness, underlies the remarkable properties observed in their optoelectr…
Observation of Superconducting Solitons by Terahertz-Light-Driven Persistent Pseudo-Spin Coherence
M. Mootz, C. Vaswani, C. Huang +8
Overcoming the decoherence bottleneck remains a central challenge for advancing coherent superconducting quantum device and information technologies. Solitons -- non-dispersive wav…
Non-equilibrium Pair Breaking in Ba(Fe1-xCox)2As2 Superconductors: Evidence for Formation of Photo-Induced Excitonic Spin-Density-Wave State
X. Yang, L. Luo, M. Mootz +5
Ultrafast terahertz (THz) pump{probe spectroscopy reveals unusual out-of-equilibrium Cooper pair dynamics driven by femtosecond (fs) optical quench of superconductivity (SC) in iro…
Geometric pumping and dephasing at topological phase transition
B. Q. Song, J. D. H. Smith, L. Luo +1
A measure-preserving formalism (MPF) is constructed and applied to spin/band models, which yield observations about pumping. It occurs at topological phase transition (TPT), i.e.,…
Protocols and Techniques for a Scalable Atom--Photon Quantum Network
L. Luo, D. Hayes, T. A. Manning +5
Quantum networks based on atomic qubits and scattered photons provide a promising way to build a large-scale quantum information processor. We review quantum protocols for generati…
Light Quantum Control of Persisting Higgs Modes in Iron-Based Superconductors
C. Vaswani, J. H. Kang, M. Mootz +12
The Higgs mechanism, i.e., spontaneous symmetry breaking of the quantum vacuum, is a cross-disciplinary principle, universal for understanding dark energy, antimatter and quantum m…
Photon collection from a trapped ion--cavity system
J. D. Sterk, L. Luo, T. A. Manning +2
We present the design and implementation of a trapped ion cavity QED system. A single ytterbium ion is confined by a micron-scale ion trap inside a 2 mm optical cavity. The ion is…
Extreme Terahertz Magnon Multiplication Induced by Resonant Magnetic Pulse Pairs
C. Huang, L. Luo, M. Mootz +7
Nonlinear interactions of spin-waves and their quanta, magnons, have emerged as prominent candidates for interference-based technology, ranging from quantum transduction to antifer…
Finite-time stability of nonlinear conformable fractional-order delayed impulsive systems: Impulsive control and perturbation perspectives
L. Luo, L. Li, Z. Liu +1
This paper investigates the finite-time stability (FTS) of nonlinear conformable fractional-order delayed impulsive systems (CFODISs). Using the conformable fractional-order (CFO)…
Ultrafast generation and detection of propagating coherent acoustic phonon wave packets in ultra-thin iron pnictide films
D. Cheng, B. Song, J. H. Kang +9
We observe pronounced oscillations in differential reflectivity of 9 nm and 60 nm BaFe\textsubscript{2}As\textsubscript{2} (Ba-122) thin films using ultrafast optical spectroscopy.…
Light-Driven Raman Coherence as a Non-Thermal Route to Ultrafast Topology Switching
C. Vaswani, L. -L. Wang, D. H. Mudiyanselage +14
A grand challenge underlies the entire field of topology-enabled quantum logic and information science: how to establish topological control principles driven by quantum coherence…
Nuclear Spin-Depleted, Isotopically Enriched 70Ge/28Si70Ge Quantum Wells
O. Moutanabbir, S. Assali, A. Attiaoui +6
The p-symmetry of the hole wavefunction is associated with a weaker hyperfine interaction as compared to electrons, thus making hole spin qubits attractive candidates to implement…
Reversible modulation and ultrafast dynamics of THz resonances in strongly photoexcited metamaterials
I. Chatzakis, L. Luo, J. Wang +4
We demonstrate an ultrafast reversible modulation of resonant terahertz (THz) response in strongly photoexcited metamaterials. The transient spectral-temporal response of the dipol…
Sound propagation in a Fermi gas near a Feshbach resonance
J. Joseph, B. Clancy, L. Luo +3
Sound waves are observed and studied in an optically trapped degenerate Fermi gas of spin-up and spin-down atoms with magnetically tunable interactions. Measurements are made throu…
Quantum Liouville's theorem based on Haar measure
B. Q. Song, J. D. H. Smith, L. Luo +1
Liouville theorem (LT) reveals robust incompressibility of distribution function in phase space, given arbitrary potentials. However, its quantum generalization, Wigner flow, is co…
Coherent Band-Edge Oscillations and Dynamic LO Phonon Mode Splitting as Evidence for Polaronic Coupling in Perovskites
Z. Liu, C. Vaswani, L. Luo +12
The coherence of collective modes, such as phonons, and their modulation of the electronic states are long sought in complex systems, which is a cross-cutting issue in photovoltaic…
Non-stoichiometry effects on the extreme magnetoresistance in Weyl semimetal WTe2
J. X. Gong, J. Yang, M. Ge +9
Non-stoichiometry effect on the extreme magnetoresistance is systematically investigated for the Weyl semimetal WTe2. Magnetoresistance and Hall resistivity are measured for the as…