Alfred Zong
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View article: Joint commensuration in moiré charge-order superlattices drives shear topological defects
Joint commensuration in moiré charge-order superlattices drives shear topological defects Open
The advent of two-dimensional moiré systems has revolutionized the exploration of phenomena arising from strong correlations and nontrivial band topology. Recently, a moiré superstructure formed by two coexisting charge density wave (CDW) …
View article: Structural contribution to light-induced gap suppression in Ta$_2$NiSe$_5$
Structural contribution to light-induced gap suppression in Ta$_2$NiSe$_5$ Open
An excitonic insulator is a material that hosts an exotic ground state, where an energy gap opens due to spontaneous condensation of bound electron-hole pairs. Ta$_2$NiSe$_5$ is a promising candidate for this type of material, but the coex…
View article: Observation of Orbital-Selective Dual Modulations in an Anisotropic Antiferromagnetic Kagome Metal <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>TbTi</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi>Bi</mml:mi></mml:mrow><mml:mrow><mml:mn>4</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>
Observation of Orbital-Selective Dual Modulations in an Anisotropic Antiferromagnetic Kagome Metal Open
Orbital selectivity is pivotal in dictating the phase diagrams of multiorbital systems, with prominent examples including the orbital-selective Mott phase and superconductivity. The intercalation of anisotropic layers represents an effecti…
View article: Revisiting the charge-density-wave superlattice of 1$T$-TiSe$_2$
Revisiting the charge-density-wave superlattice of 1$T$-TiSe$_2$ Open
A number of intriguing phenomena, including exciton condensation, orbital ordering, and emergence of chirality, have been proposed to accompany charge-density-wave (CDW) formation in the layered transition metal dichalcogenide 1$T$-TiSe$_2…
View article: Time-domain study of coupled collective excitations in quantum materials
Time-domain study of coupled collective excitations in quantum materials Open
Quantum materials hold immense promises for future applications due to their intriguing electronic, magnetic, thermal, and mechanical properties that often arise from a complex interplay between microscopic degrees of freedom. Important in…
View article: Correlated spin-wave generation and domain-wall oscillation in a topologically textured magnetic film
Correlated spin-wave generation and domain-wall oscillation in a topologically textured magnetic film Open
View article: Large moiré superstructure of stacked incommensurate charge density waves
Large moiré superstructure of stacked incommensurate charge density waves Open
Recent advances in van der Waals heterostructures have opened the new frontier of moiré physics, whereby tuning the interlayer twist angle or adjusting lattice parameter mismatch have led to a plethora of exotic phenomena such as unconvent…
View article: Time-domain study of coupled collective excitations in quantum materials
Time-domain study of coupled collective excitations in quantum materials Open
Quantum materials hold immense promises for future applications due to their intriguing electronic, magnetic, thermal, and mechanical properties that often arise from a complex interplay between microscopic degrees of freedom. Important in…
View article: Observation of Orbital-Selective Dual Modulations in an Anisotropic Antiferromagnetic Kagome Metal TbTi3Bi4
Observation of Orbital-Selective Dual Modulations in an Anisotropic Antiferromagnetic Kagome Metal TbTi3Bi4 Open
Orbital selectivity is pivotal in dictating the phase diagrams of multiorbital systems, with prominent examples including the orbital-selective Mott phase and superconductivity, etc. The intercalation of anisotropic layers represents an ef…
View article: Room-temperature non-volatile optical manipulation of polar order in a charge density wave
Room-temperature non-volatile optical manipulation of polar order in a charge density wave Open
View article: UV-Induced Reaction Pathways in Bromoform Probed with Ultrafast Electron Diffraction
UV-Induced Reaction Pathways in Bromoform Probed with Ultrafast Electron Diffraction Open
For many chemical reactions, it remains notoriously difficult to predict and experimentally determine the rates and branching ratios between different reaction channels. This is particularly the case for reactions involving short-lived int…
View article: Core-level signature of long-range density-wave order and short-range excitonic correlations probed by attosecond broadband spectroscopy
Core-level signature of long-range density-wave order and short-range excitonic correlations probed by attosecond broadband spectroscopy Open
Advances in attosecond core-level spectroscopies have successfully unlocked the fastest dynamics involving high-energy electrons. Yet, these techniques are not conventionally regarded as an appropriate probe for low-energy quasiparticle in…
View article: Hidden correlations in stochastic photoinduced dynamics of a solid-state electrolyte
Hidden correlations in stochastic photoinduced dynamics of a solid-state electrolyte Open
Photoexcitation by ultrashort laser pulses plays a crucial role in controlling reaction pathways, creating nonequilibrium material properties, and offering a microscopic view of complex dynamics at the molecular level. The photo response f…
View article: Coexistence of Interacting Charge Density Waves in a Layered Semiconductor
Coexistence of Interacting Charge Density Waves in a Layered Semiconductor Open
Coexisting orders are key features of strongly correlated materials and underlie many intriguing phenomena from unconventional superconductivity to topological orders. Here, we report the coexistence of two interacting charge-density-wave …
View article: A solid-state high harmonic generation spectrometer with cryogenic cooling
A solid-state high harmonic generation spectrometer with cryogenic cooling Open
Solid-state high harmonic generation (sHHG) spectroscopy is a promising technique for studying electronic structure, symmetry, and dynamics in condensed matter systems. Here, we report on the implementation of an advanced sHHG spectrometer…
View article: Ultrafast formation of topological defects in a two-dimensional charge density wave
Ultrafast formation of topological defects in a two-dimensional charge density wave Open
View article: Delamination-Assisted Ultrafast Wrinkle Formation in a Freestanding Film
Delamination-Assisted Ultrafast Wrinkle Formation in a Freestanding Film Open
Freestanding films provide a versatile platform for materials engineering thanks to additional structural motifs not found in films with a substrate. A ubiquitous example is wrinkles, yet little is known about how they can develop over as …
View article: Room-temperature non-volatile optical manipulation of polar order in a charge density wave
Room-temperature non-volatile optical manipulation of polar order in a charge density wave Open
Utilizing ultrafast light-matter interaction to manipulate electronic states of quantum materials is an emerging area of research in condensed matter physics. It has significant implications for the development of future ultrafast electron…
View article: Intrinsic 1$${T}^{{\prime} }$$ phase induced in atomically thin 2H-MoTe2 by a single terahertz pulse
Intrinsic 1$${T}^{{\prime} }$$ phase induced in atomically thin 2H-MoTe2 by a single terahertz pulse Open
The polymorphic transition from 2 H to 1 $${T}^{{\prime} }$$ -MoTe 2 , which was thought to be induced by high-energy photon irradiation among many other means, has been intensely studied for its technological relevance in nanoscale …
View article: A solid-state high harmonic generation spectrometer with cryogenic cooling
A solid-state high harmonic generation spectrometer with cryogenic cooling Open
Solid-state high harmonic generation spectroscopy (sHHG) is a promising technique for studying electronic structure, symmetry, and dynamics in condensed matter systems. Here, we report on the implementation of an advanced sHHG spectrometer…
View article: Spin-mediated shear oscillators in a van der Waals antiferromagnet
Spin-mediated shear oscillators in a van der Waals antiferromagnet Open
View article: Evidence for Bootstrap Percolation Dynamics in a Photoinduced Phase Transition
Evidence for Bootstrap Percolation Dynamics in a Photoinduced Phase Transition Open
Upon intense femtosecond photo-excitation, a many-body system can undergo a phase transition through a non-equilibrium route, but understanding these pathways remains an outstanding challenge. Here, we use time-resolved second harmonic gen…
View article: Design and construction of a compact, high-repetition-rate ultrafast electron diffraction instrument
Design and construction of a compact, high-repetition-rate ultrafast electron diffraction instrument Open
We present the design and performance of a compact ultrafast electron diffraction instrument. The diffractometer provides a means of examining time-resolved ultrafast dynamical properties of solids. The system’s utilization is discussed in…
View article: Probing lithium mobility at a solid electrolyte surface
Probing lithium mobility at a solid electrolyte surface Open
View article: The spontaneous symmetry breaking in Ta <sub>2</sub> NiSe <sub>5</sub> is structural in nature
The spontaneous symmetry breaking in Ta <sub>2</sub> NiSe <sub>5</sub> is structural in nature Open
The excitonic insulator is an electronically driven phase of matter that emerges upon the spontaneous formation and Bose condensation of excitons. Detecting this exotic order in candidate materials is a subject of paramount importance, as …
View article: Delamination-assisted ultrafast wrinkle formation in a freestanding film
Delamination-assisted ultrafast wrinkle formation in a freestanding film Open
The ability to synthesize and control two-dimensional (2D) crystals creates numerous opportunities for studying emergent states of matter and their novel functionalities. Freestanding films provide a particularly versatile platform for mat…
View article: Ultrafast formation of topological defects in a 2D charge density wave
Ultrafast formation of topological defects in a 2D charge density wave Open
Topological defects play a key role in nonequilibrium phase transitions, ranging from birth of the early universe to quantum critical behavior of ultracold atoms. In solids, transient defects are known to generate a variety of hidden order…
View article: Dynamical criticality of spin-shear coupling in van der Waals antiferromagnets
Dynamical criticality of spin-shear coupling in van der Waals antiferromagnets Open
View article: Periodic dynamics in superconductors induced by an impulsive optical quench
Periodic dynamics in superconductors induced by an impulsive optical quench Open
View article: Dynamics of topological defects after a photo-induced melting of a charge-density wave
Dynamics of topological defects after a photo-induced melting of a charge-density wave Open
Charge-density-wave order in a solid can be temporarily "melted" by a strong laser pulse. Here we use the discrete Gross-Pitaevskii equation on a cubic lattice to simulate the recovery of the CDW long-range phase coherence following such a…