The coalescence of binary neutron star (BNS) in the event GW170817, leading to the generation of gravitational waves (GW) and accompanied by kilonova (KNe), the electromagnetic (EM) counterpart, has been a prime topic of interest for the Astronomy community in recent times as it provided much insight into multi-messenger astronomy. Since its discovery in 2017, several research teams have put...
Various recent data analyses and modeling simulations provide strong evidence of a giant distant planet in the outer region of the solar system, which is also known as Plane Nine or Planet X. However, the existence of this planet has not been demonstrated by observations. Since it is more difficult to detect the reflected sunlight from Planet Nine than its thermal radiation, infrared surveys...
The tunneling current is the only outgoing signal in scanning tunneling microscopy (STM) experiments. The current contains information about electronic states, the transition between these states, and the gap itself, which is formed between the probe and the studied system. Since its invention, the instrumental development reflects our increasing access to the different components which are...
While the family of 2D materials under active study has exploded over the last decade or two (Xenes, TMDs and others) They are usually studied experimentally in their simplest and most pristine (ordered, crystalline) state, which is what theoretical models based on unit cells model (e.g. DFT). But unusual and interesting behaviors can arise in materials which deviate from their perfectly...
This study explores the dielectric properties and relaxation behaviors of propylene carbonate (PC) and its binary blends with methanol and ethanol. Utilizing a coaxial-circular cutoff waveguide junction, broadband dielectric spectra (0.1 GHz to 18 GHz) were characterized, employing a two-group Debye model to extract relaxation parameters. Analysis of excess thermodynamic parameters, Kirkwood...
In conformal invariant $(1+1)$-dimensional systems subjected to periodic driving,
there are heating and non-heating phases characterized by linear growth and oscillation of the entanglement entropy respectively [arXiv preprint arXiv:1805.00031]. In this work, we explore different setups without conformal symmetry by employing Poincar\'e disk realizations for periodic driven systems with...
Finding protoclusters in the epoch of reionization plays an essential role in understanding the evolution of galaxies and the early ionized universe. With this aim, we turn our attention to the COSMOS-Web field (α=10:00:27.92, δ=+02:12:03.5), spanning 41'.5 by 46'.5. At the present time, the lack of open access to reduced data triggered us to develop our own image reduction techniques utilize...
When approaching a liquid surface, droplets have a tendency to merge in order to minimize the surface energy. However, they can exhibit a phenomenon called coalescence delay in most cases that keeps them floating for tens of milliseconds. The duration is known as the residence time or the non-coalescence time. Surprisingly, under identical parameters and initial conditions, the residence time...
In the biodiesel production process, esterification is an essential step, but it typically consumes a considerable amount of time before meeting the criteria for proceeding to the next phase, the transesterification reaction. Based on the previous work in our laboratory, we have demonstrated a stirring cavity utilizing a 2.45GHz microwave, which enhanced esterification reaction employing a...
One of the most important development in AdS/CFT correspondence is the RT formula[1]. This formula states that entanglement entropy of boundary CFT will equal to bulk AdS minimum surface
\begin{equation}
S(V) = min[\frac{A(m)}{4G_N}]
\end{equation}
Which gives a big convenience to calculate entanglement entropy in CFT.
Later research[2] shows that this conjecture becomes obvious in...
The quantum size effect plays a crucial role in the fundamental physics as well as technological applications in the two-dimensional materials. In our studies, we have investigated the quantum size effect on the antiferromagnetic 120$^\circ$ Néel state of monolayer Mn on Ag(111) by utilizing spin-polarized scanning tunneling microscopy (SP-STM). The typical area sizes of Mn nanoislands under...
The nature of the interaction between active galactic nuclei (AGNs) and their host galaxies remains an unsolved question. Therefore, conducting an AGN census is valuable to AGN research. Nevertheless, a significant fraction of AGNs are obscured by their environment, which blocks UV and optical emissions due to the dusty torus surrounding the central supermassive black hole (SMBH). To overcome...
The N-body simulation of asteroids outside the Neptune shows there could be a massive object there, called Planet 9. We assume Planet 9 emit grey body radiation and try to find it in the space telescope AKATI's image.
The enigma of the missing baryons poses a prominent and unresolved problem in astronomy. Dispersion measures (DM), serving as a distinctive observable of fast radio bursts (FRBs), quantify the electron column density along each line of sight, revealing the missing baryons described in the Macquart (DM-z) relation. The scatter of this relation is anticipated to be the variation of cosmic...
The unique ability of fire ants to form a raft to survive flooding rain has enchanted biologists as well as researchers in other disciplines. It was established during the last decade that a three-dimensional aggregation of fire ants exhibits viscoelasticity with respect to external compression and shearing among numerous unusual mechanical properties. Continuing these works, we will study the...
In this work,we study the growth of germanene on Ag111 basis that depositing Bi atom.Bi will form three structures on Ag111 according to different deposition amounts: Ag2Bi-Root3 X Root3 R30, Bi/Ag111-(p x root3), and Bi(110)/Ag(111).We use LEED(low energy electron diffraction) to investigate the germanene lattice structures formed by depositing Ge on two different Bi/Ag111 surfaces :
1....
Using low-energy electron diffraction (LEED) and angle-resolved photoemission spectroscopy (ARPES) techniques, we studied germanene on Ag(111) and divided our results into three parts:
1.At higher annealing temperatures, two new quasi-freestanding phases (QP) germanene, referred to as new QP1 and new QP2, were grown and compared with the QP R30° prevoously discovered.
2.Growth of two...
The emergence of two-dimensional topological materials and spontaneous magnetization holds the potential for the realization of the quantum anomalous Hall effect. In this research, we employ spin-polarized scanning tunneling microscopy (SP-STM) to investigate the structural and magnetic characteristics of manganese (Mn) deposition on the Bi/Ag(111) surface. The deposition of Mn on Bi/Ag(111)...
Machine learning (ML) has emerged as a powerful tool in quantum state tomography (QST), facilitating the extraction of comprehensive information about quantum states. Leveraging ML architectures such as convolutional neural networks, we present a rapid and robust QST approach for continuous variables using experimentally measured data from balanced homodyne detectors. Our method offers...
The conventional process of carbon fiber has several stages, including oxidation, pre-carbonization, and carbonization. The oxidation is the most time-consuming one, taking approximately 90-120 minutes at temperatures ranging from 200-300°C. According to previous research, using the properties of microwaves can significantly reduce the oxidation process time to a total of 13 minutes (8+5...
We present an enhanced quantum network communication protocol, building upon the standard MDI-QKD framework. This method achieves a 148 times improvement in the key rate and effectively mitigates quantum bit error rate from asymmetric channels. We demonstrate the new protocol in the laboratory and its progress towards commercial viability. Our aim is to develop practical quantum communication...
Biphoton generation has emerged as a pivotal tool in quantum research, offering the capability to produce heralded single photons. Leveraging the strong temporal correlation between two photons, one photon can be used as a trigger, and we can effectively use the second photon to conduct research in quantum information, quantum simulation and communication. Biphotons generated via the four-wave...
Measurement of polarization is important in understanding radiation mechanisms of pulsars and coronal geometry of X-ray binaries. In this study, we propose to implement a small Compton Polarimeter on-board a 6U Cubesat to study the gamma ray polarization of the Crab and Cygnus X-1. The instrument is based on Gadolinium Aluminum Gallium Garnet (GAGG, chemical formula: $Gd_3Al_2Ga_3O_{12}$)...
Understanding the fundamental theory of preventing thermalization is crucial for practical quantum device development. In this study, we delve into prior research on quantum many-body scars in the U(1) lattice gauge theory. By interpreting the Hamiltonian as the adjacency matrix defining an undirected graph, we pinpoint these scars as subgraphs exhibiting perfect destructive interference at...
The Kitaev honeycomb model can be viewed as a system consisting of Majorana fermions coupled to a $\mathbb{Z}_2$ gauge field, for which the accompanied $\mathbb{Z}_2$ vortex is called the vison. Recently, a study introduced a Green’s function approach to analytically compute the energy cost of generating a vison in the Kitaev honeycomb model. On the other hand, some studies proposed that the...
The Rashba system, originated from strong spin-orbit coupling induces energy band splitting for electrons of opposite spins, exhibit distinctive interactions when coupled with a magnetic impurity. Previous STM/STS studies have demonstrated that the antiphase boundary of the Rashba system BiAg2 stabilizes an alternative structure for manganese phthalocyanine (MnPc) molecules, resulting in a...
The quest to comprehend the origin and evolution of the cosmos stands as one of the most profound enigmas in the realm of science. It encompasses the birth of fundamental elements, the intricate process of star and galaxy formation, and the dawn of the first galaxies in our ever-expanding universe. At the heart of this quest lies the imperative task of identifying the most remote galaxies,...
Fiber Bragg gratings (FBGs) are distributed reflectors realized by periodic or aperiodic variation of refractive in optical fibers. In this work, we explore the waveform shaping of a phase-modulated optical pulse at the single photon level in a FBG. We describe the theory, simulation, techniques and provide anovel approach to control waveform.
Active galactic nuclei (AGN) feedback's role in suppressing cooling flows in cool-core clusters is acknowledged, but the primary heating mechanism of AGN jets is debated. One potential heating mechanism is heating caused by turbulence induced by AGN jet-inflated bubbles. However, there has been disagreement between simulation and observational studies. Therefore, the goal of our study is to...
The ratio of the polarized synchrotron emission to the total emission, i.e., the polarization degree, is known to be (p+1)/(p+7/3) or (α +1)/(α +5/3), for electrons with a power-law energy distribution of index p, where α = (p − 1)/2 is the spectral index. In this article, we first show the limitation of the formula, and then we propose a generalized version of this formula which could serve...
Gyrotron devices, based on the principles of the electron cyclotron maser (ECM) instabilities, are powerful high-frequency microwave sources. In this study, we focus on specific type of reflective type gyro-BWO , which consist of several tapered section and can achieve a phenomenal output efficiency and bandwidth. This study investigates the effect of structural nonuniformities on the...
Abstract :
When the system have time-reversal symmetry and inversion symmetry, the energy band of the system is not allowed to split. When one of the symmetries is breaking, the energy band is allowed to split.
The model of PbAu alloy has a special configuration that induce inversion symmetry breaking then Rashba effect.
Even under the same substrate, Different growth methods will also...
For a long time, most gyrotron oscillators have avoided utilizing TM modes because of the concerns about strong bunching competition and relatively weak beam-wave coupling. However, this work demonstrates that an axis-encircling electron beam with high mode selectivity is adapted to preclude most parasitic modes and makes the TM12-mode oscillation in an open-cavity-type gyrotron system...
We present magnetic field strength maps in the star-forming regions, including IC348, L1448, L1455, NGC1333, and PerB1, of the Perseus molecular cloud. The angular dispersion is calculated from the 850 µm linear polarization maps as part of B-fields In STar-forming Region Observations (BISTRO) survey. The velocity dispersion is estimated from spectral lines of C$^{18}$O and N$_2$H$^+$. The...
We explore the topological phases of a three dimensional canted antiferromagnetic insulator featuring Dresselhaus and Rashba spin-orbit couplings. In contrast to previous studies that rely on assumed Néel order to classify topological properties, we acknowledge the potential impact of spin-orbit interactions on the Néel orde. Employing self-consistent magnetic order calculations, we observe...
The percolation theory has garnered extensive attention over the last four decades in the context of permittivity and conductivity, with a noticeable gap in the exploration of permeability. This research delves into the percolation phenomena's impact on the permittivity, permeability, and conductivity of a silver-epoxy nano-composite. The identified percolation threshold falls within the range...
We applied a novel scenario to impose constraints on the relic abundance $f_{\rm PBH}$ of primordial black holes (PBHs) in the mass range $10^{-14}\leq M_{\rm PBH}/M_{\odot}\leq 10^{-11}$ which cannot be probed by microlensing or evaporation methods: When a PBH with the aforementioned mass transits through a white dwarf (WD) made up of carbon and oxygen, Bondi-Hoyle-Lyttleton (BHL) accretion...
Matrix Product State (MPS) and Density Matrix Renormalization Group (DMRG) serve as effective variational techniques for investigating the low-energy states within quantum many-body systems, utilizing the underlying entanglement structures. By broadening the scope of MPS as a data representation framework, it becomes more adept at capturing intricate correlations within the system. Recent...
[n]Phenacene [1] have gained significant attention for their potential application in organic field-effect transistors (OFET) [2,3]. They are stable under ambient conditions, demonstrate high charge mobility, and are chemically easily tailorable for the design of desired electronic, optical, or mechanical properties.
We investigate the growth and electronic properties of DiBenzo[6]Phenacene...
