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NGAI CHUN LUNG (NTHU)25/03/2026, 13:00Astronomy and Astrophysics
In the poster, I will represent our recent work on gravitational wave physics. In particular, we are interested in the signals from compact binary coalescences in the sub-solar mass region. According to our knowledge, there are no formation channels for black holes and neutron stars in such mass region. Detection of such signals allows us to give hints to new physics and constraint some dark...
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Yun-Chuan Su (Department of Physics, National Tsing Hua University, Hsinchu 30013, Taiwan)25/03/2026, 13:03Condensed Matter Experiment
We report polarization-dependent resonant inelastic X-ray scattering (RIXS) measurements that reveal the order–disorder nature of the antiferroelectric (AFE)–paraelectric (PE) transition in the van der Waals multiferroic CuCrP$_2$S$_6$. The RIXS transition from the high-spin $^4A_{2g}$ ground state of the Cr$^{3+}$ ion to a state with $^{4}T_{1g}$ symmetry splits into two $dd$ excitations at...
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Hsuan-Yi Chen (Department of Physics, National Tsing Hua University, Hsinchu 300044, Taiwan)25/03/2026, 13:06Condensed Matter Experiment
Transition metal dichalcogenides (TMDs), such as $\text{WSe}_2$ and $\text{MoS}_2$, have attracted considerable attention due to their distinctive excitonic properties and promising applications in optoelectronic devices. In this work, we investigate the optical transitions and defect-related excitonic states in chemical vapor deposition (CVD)-grown $\text{WSe}_2$ and $\text{MoS}_2$, where the...
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YUAN-MIN LAI (National Tsing Hua University)25/03/2026, 13:09Condensed Matter Experiment
We have investigated the superconducting vortices in Pb monolayer and thin films on Si(111) by using
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scanning tunneling microscopy and spectroscopy (STM/STS). In the monolayer case, zero-bias
conductance (ZBC) mapping indicates that each vortex carries a single magnetic flux quantum (Φ₀) and
arranges into a hexagonal lattice, consistent with Abrikosov’s prediction. The experimentally... -
Jo-Shui Kao (NTHU/ASIAA)25/03/2026, 13:12Astronomy and Astrophysics
Magnetic fields play an important role in the star formation process and collapsing dense
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cores. However, it is difficult to directly measure the magnetic field strength in observation. The polarization–intensity gradient method is a new approach to estimate the magnetic field strength using polarization angle and intensity gradient, which can provide the map of position-dependent magnetic... -
Zong-Syun Li25/03/2026, 13:15Condensed Matter Experiment
Hexagonal boron nitride (hBN) has emerged as a promising host for stable quantum emitters, with blue emission centers offering potential for applications in quantum photonics and nanoscale sensing. A key advantage of these emitters is their ability to release one photon at a time, which is essential for secure quantum communication and scalable photonic quantum technologies. Achieving precise...
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Mr Chen-Chih Wang (Department of physics, National Tsing Hua University)25/03/2026, 13:18Condensed Matter Theory
We give an exact form of the density matrix of the spin-1/2 Kitaev spin liquid represented in terms of spin operators and study the entanglement properties of the Kitaev model within the spin framework. With the explicit form of the density matrix, plus the exact Gauss law of the emergent gauge theory and the exact 1-form Wilson symmetry in the Kitaev model, we demonstrate the existence of the...
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YU-SHENG LUO25/03/2026, 13:21Condensed Matter Experiment
We investigate the electronic and magnetic properties of manganese phthalocyanine (MnPc) molecules adsorbed on the Pb(001) surface, extending previous studies on MnPc/Pb(111). In contrast to the isotropic Fermi surface of Pb(111), Pb(001) exhibits pronounced anisotropy, providing a unique platform to explore anisotropy-driven effects in impurity–superconductor systems. Using scanning tunneling...
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Ping-Hau Chen (National Tsing Hua University)25/03/2026, 13:24Condensed Matter Experiment
Two-dimensional semiconductor heterostructures provide a rich platform for exploring strongly bound excitons and interlayer coupling phenomena. In particular, moiré superlattices formed by stacking transition metal dichalcogenide (TMD) monolayers enable tunable hybridization between excitonic states across layers. We investigate the electrical-driven band evolution in WS$_2$/ MoSe$_2$...
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林 郁晨25/03/2026, 13:27Condensed Matter Experiment
Single-photon emitters (SPEs) are key building blocks for next-generation quantum communication and information technologies. Hexagonal boron nitride (hBN), with its graphene-like layered structure, wide bandgap, and van der Waals bonding, has emerged as a promising host material for stable, room-temperature single-photon emission. In this study, we significantly enhance the density and...
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Yong-Cheng Pan25/03/2026, 13:30Condensed Matter Experiment
We report a systematic magnetotransport study on high-crystallinity overdoped La$_{(1-x)}$Sr$_x$NiO$_2$ (LSNO) thin films with x = 0.20-0.24. By conducting pulsed-field transport experiment up to 62 T, we reveal two salient features of the normal-state transport in this LSNO thin films: (1) the magnetoresistivity does not follow the Kohler's scaling rule but exhibit a H-linear behavior in...
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Yi-Chun Huang (Department of Physics, National Tsing Hua University, Hsinchu, Taiwan)25/03/2026, 13:35Condensed Matter Experiment
High resolution scanning tunneling microscopy has been used to characterize the structural properties and growth mechanism of iron oxide thin film deposited on an Ag(001) substrate. Our experimental results show that the FeO(111) monolayer exhibits a c(2 × 10)/p(2 × 11)/c(2 × 12) unit cell due to lattice matching between the hexagonal overlayer and square substrate lattices. Besides, line...
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Hsin-Yu Chen (Department of Physics, National Tsing Hua University, Hsinchu 30013, Taiwan)25/03/2026, 13:38Condensed Matter Theory
Milling behavior—such as the vortex-like motion observed in reindeer herds, fish schools, and army ant colonies—represents a striking example of collective dynamics in nature. The milling structure is formed spontaneously and maintained continuously, but the underlying mechanisms are still unclear. We think that animals' anisotropic perception or attention is important; therefore, we account...
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tzuning Yen25/03/2026, 13:41Condensed Matter Experiment
Sr₂IrO₄ is a 5d Mott insulator that shares the defining characteristics with the high-temperature cuprate superconductors. The absence of superconductivity in doped Sr₂IrO₄ makes it an attractive platform to study the low-temperature electronic properties and manifestation of quantum criticality therein. In this study, we synthesize a series of Sr₂(Ir,Rh) O₄ polycrystalline samples with 0 < x...
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偉軒 高25/03/2026, 13:44Condensed Matter Experiment
Here we report preliminary results of expixial growth of MnTe/Bi₂Te₃ heterostructures on Si(111).
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In depositing Bi₂Te₃ on Si(111), we observe clear RHEED oscillation, indicating layer-by-layer growth. The measured lattice constant of Bi₂Te₃ thin films is around 4.38Å, consistent with theliterature. On the other hand, the RHEED pattern from MnTe layer, which is grown on top of Bi₂Te₃/Si(111),... -
Ms Yixuan Lin (NTHU)25/03/2026, 13:47High Energy Theory
Black hole superradiance provides a unique mechanism for probing particle production. In this work, we investigate the extragalactic neutrino flux produced by quenched superradiance around Primordial Black Holes (PBHs).
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We calculate and compare the neutrino flux and peak energy across various coupling constants and light boson masses for both the scalar and vector cases. On our poster, we... -
Yen-Chen Chiang25/03/2026, 13:50Atomic, Molecular and Optical Physics
Non-collinear optical parametric amplifier (NOPA) belongs to ultrafast laser technology and generates high-power, frequency-tunable pulses by mixing a pump beam and a white-light seed at an angle within a nonlinear optical crystal. Our home-built NOPA features a dual-beam configuration: one path utilizes a green pump to generate tunable infrared output, while the other employs an ultraviolet...
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Meng-Zhe Yang (National Tsing Hua University)25/03/2026, 13:53Astronomy and Astrophysics
We investigate the magnetic field in the massive star-forming region Onsala 2 (ON2) in Cygnus-X complex using the polarization observations at 850µm performed as part of the James Clerk Maxwell Telescope (JCMT) B-Fields In Star-Forming Region Observations survey (BISTRO) with the POL-2 instrument. Our data cover the entire ON2 complex at a resolution of ~0.12 pc, allowing us to spatially...
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Mr Terry Long Phan (Institute of Astronomy, National Tsing Hua University, Hsinchu, Taiwan)25/03/2026, 13:56Astronomy and Astrophysics
The outer solar system is theoretically predicted to harbor an undiscovered planet, often referred to as Planet Nine (P9). Simulations suggest that its gravitational influence could explain the unusual clustering of distant Kuiper Belt Objects. However, no observational evidence for P9 has been found so far, as its predicted orbit lies far beyond Neptune, where it reflects only a faint amount...
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Yu-Cheng Lin (NTHU)25/03/2026, 13:59Condensed Matter Experiment
Recent studies of moiré physics in bilayer transition-metal dichalcogenides (TMDs) have largely focused on interlayer excitons, whose photoluminescence (PL) is typically weak and thus less suitable for quantum photonics applications. Here, we demonstrate that intralayer moiré excitons can be formed in a heterostructure composed of insulating Mg(OH)$_2$ and monolayer(ML) MoSe$_2$. Zero...
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Ren Hao Lee (Department of Physics, National Tsing Hua University, Hsinchu City, Taiwan)25/03/2026, 14:02Condensed Matter Theory
Cell polarity provides a classic example of spatial self-organization in biological systems, where proteins accumulate asymmetrically on the cell membrane. This phenomenon can be modeled by the mass-conserved activator–substrate (MCAS) model, which is formulated as a set of reaction–diffusion equations describing the exchange between membrane-bound and cytosolic species. In the standard...
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Ms Yi−Syun Hsieh (Department of Physics, National Tsing Hua University, Hsinchu 300044, Taiwan)25/03/2026, 14:05Condensed Matter Experiment
Recently, Janus Transition Metal Dichalcogenide (TMD) monolayer MoSSe, with a sandwiched S–Mo–Se structure, has been synthesized by replacing the top S atomic layer in MoS2 with Se atoms. Compared with MoS2, Janus TMDs MoSSe exhibit superior electron mobility as well as enhanced nonlinear optical responses. These characteristics make Janus TMDs highly promising for...
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Bahareh Soleimanpour Salmasi (National Tsing Hua University)25/03/2026, 14:08Astronomy and Astrophysics
Fuzzy dark matter (FDM) provides an alternative to the standard cold dark matter picture by suppressing small-scale structure formation through quantum pressure effects. In this work, we test whether FDM can better reproduce the high neutral hydrogen fractions inferred from recent JWST observations at redshifts z > 8. We generate 21 cm reionization histories with 21cmFirstCLASS over a grid of...
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Fang-Tzu Chang (Department of Physics, National Tsing Hua University, Hsinchu, Taiwan)25/03/2026, 14:11Condensed Matter Experiment
This study about the growth of Bi on a Co-covered Cu(111) surface . Revealing that distinct surface superstructures such as √3 ×√3 R30° surface alloy and [2012] phase can be selectively fabricated by controlling the deposition parameters. The atomic arrangements and local electronic properties of these structures were characterized using scanning tunneling microscopy (STM) and spectroscopy...
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yentung lin25/03/2026, 14:14Condensed Matter Theory
We employ a tree-tensor-network strong-disorder renormalization group (tSDRG) to study the disordered antiferromagnetic spin-$3/2$ Heisenberg chain with bond-alternations. Extended SDRG predicts two distinct random-singlet regimes in the weak- and strong-disorder limits, characterized by different effective-spin structures ($S_{\mathrm{eff}}=1/2$ and $S_{\mathrm{eff}}=3/2$), separated by an...
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Srivardini Ayyappan (NTHU, Macquarie University)25/03/2026, 14:17Astronomy and Astrophysics
It is important to find and study protoclusters in the distant Universe during their formative stages in order to understand the formation and evolution of present-day galaxy clusters. In the pre-JWST era, protocluster candidates were primarily identified up to z ≲ 7, limited by optical wavelength coverage and survey area. With deep JWST
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near-infrared surveys such as CEERS and JADES have... -
Angel Rodriguez Barbosa (National Tsing Hua University)25/03/2026, 14:20Astronomy and Astrophysics
Active galactic nuclei (AGN) are pivotal drivers of galaxy evolution, yet many remain undetected in ultraviolet and optical surveys due to heavy dust obscuration. In these systems, dust absorbs the high-energy accretion disk emission and re-radiates it at longer wavelengths, making mid-infrared (IR) observations essential for uncovering the full population of obscured AGN. Tracking the AGN IR...
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Mr Deriyan Senjaya (Department of Physics NTHU Taiwan)25/03/2026, 14:23Astronomy and Astrophysics
The Fermi Paradox underscores the lack of evidence for advanced extraterrestrial life despite the Galaxy’s age and scale. While interstellar distances are often seen as barriers to communication and migration, Galactic rotation could shorten travel times and enable expansion. Yet most models overlook destructive astrophysical hazards. Hazardous astrophysical events—asteroid impacts, supernovae...
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Hong-Yueh Huang (NTHU PHYS)25/03/2026, 14:26Atomic, Molecular and Optical Physics
Optical diffractive neural networks (ODNNs) perform computation through light propagation and diffraction, yet their internal physical decision mechanism remains difficult to interpret. In this work, we propose Gradient-based Physical Activation Mapping (GPAM), a method that quantifies the contribution of each diffractive neuron by back-propagating gradients through physical wave propagation....
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YaLi Chu (IoA)25/03/2026, 14:29Astronomy and Astrophysics
The Hubble constant (H₀) characterizes the present-day expansion rate of the universe. However, despite the significant decrease in measurement uncertainties, the discrepancy of more than 4𝜎 remains between two main methods —the Cosmic Microwave Background (CMB) and Cepheid-calibrated Type Ia supernovae (SNe Ⅰa), known as the Hubble tension. To address the Hubble tension, where the ΛCDM model...
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Shao Chi Tu (Department of Physics, National Tsing Hua University)25/03/2026, 14:32Condensed Matter Experiment
Altermagnetic materials can generate spin-polarized currents for magnetic memory applications while remaining insensitive to external magnetic fields, leading to improved signal stability. MnTe is a representative altermagnetic semiconductor with zero net magnetization and anisotropic band splitting.
In this work, we use scanning tunneling microscopy and spectroscopy (STM/STS) to...
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Ping-Cheng Lu25/03/2026, 14:35Condensed Matter Theory
Active Brownian particles (ABPs) provide a minimal model for exploring collective dynamics in active matter. Recent studies suggest that active particle could have interesting elastic properties. While many continuum descriptions have been developed at the hydrodynamic scale, particle-scale mean-field approaches are more suitable for capturing emergent elastic properties. Motivated by this,...
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Leah Ya-Ling Lin (National Tsing Hua University)25/03/2026, 14:38High Energy Theory
Primordial black holes (PBHs) formed during the early universe provide a unique probe of physics beyond the Standard Model. In this study, we investigate the impact of additional degrees of freedom from supersymmetry (SUSY) particles and the memory burden effect (MBE) on the evaporation process of PBHs formed via first-order phase transitions. By analyzing how these factors influence the PBH...
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KA WENG LEI (NTHU)25/03/2026, 14:41Condensed Matter Experiment
Accurate determination of surface atomic positions relies on high-quality LEED I(V) data. This study show how to use Python to control a Raspberry Pi camera for capture LEED data. Furthermore, it shows how to fit the data to accurately extract the positions of LEED spots. In addition to obtaining high-precision lattice constants, this method also obtain I(V) curves of the diffraction spots,...
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鄺宏 周 (NTHU PHYS)25/03/2026, 14:44Condensed Matter Theory
Entanglement entropy at one-dimensional criticality typically follows the Calabrese--Cardy scaling.
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In non-unitary critical chains, however, we show that a finite system retains a universal sensitivity to a small spectral gap $\Delta$ away from the exceptional point.
Concretely, we find an additional... -
Aaman Akhtar Ahmed (National Tsing Hua University)25/03/2026, 14:47Condensed Matter Experiment
Over the past decade, On-Surface Synthesis rapidly emerged as a successful bottom-up method for synthesizing atomically precise, low-dimensional nanomaterials with tailored electronic, magnetic, and optical properties. A crucial yet unachieved goal toward single-molecule devices is the integration of reversible molecular bistability.
Here, we discuss first experimental results for an...
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Mr SHIH-SI HSIAO (National Tsing Hua University)25/03/2026, 14:50Condensed Matter Theory
In this work, We study the interplay among charge density wave (CDW), pair density wave (PDW), and d-wave superconducting (SC) orders in high-temperature cuprate superconductors. Using the renormalized mean-field theory based on the t-J model formulated in real space, we derive self-consistent equations incorporating for CDW, PDW and d-wave SC order parameters with different doping. We focus...
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