Time crystals in periodically driven systems have initially been studied assuming either the ability to quench Hamiltonian between different many-body regimes, presence of disorder or long-range interactions. Here we propose simplest scheme observe discrete time crystal dynamics a one-dimensional quantum system Ising type with short-range interactions and no disorder. The is subject only periodic kick by global magnetic field, extra quenching performed. We analyze emerging stabilizing...

The family of the superconducting quasiskutterudites (Ca(x)Sr(1-x))(3)Rh(4)Sn(13) features a structural quantum critical point at x(c)=0.9, around which dome-shaped variation transition temperature T(c) is found. Using specific heat, we probe normal and states entire series straddling point. Our analysis indicates significant lowering effective Debye on approaching x(c), interpret as result phonon softening accompanying instability. Furthermore, remarkably large enhancement 2Δ/k(B)T(c)...

Kagome metals AV$_3$Sb$_5$~(A = K, Rb, Cs) are recently discovered platforms featuring an unusual charge-density-wave (CDW) order and superconductivity. The electronic band structure of a kagome lattice can host both flat bands as well Dirac-like bands, offering the possibility to stabilize various quantum states. Here, we probe CsV$_3$Sb$_5$ via Shubnikov-de Haas oscillations on bulk single crystals thin flakes. Although our frequency spectra broadly consistent with published data,...

Abstract In conventional metals, modification of electron trajectories under magnetic field gives rise to a magnetoresistance that varies quadratically at low field, followed by saturation high for closed orbits on the Fermi surface. Deviations from behaviour, example, observation linear magnetoresistance, or non-saturating have been attributed exotic scattering mechanisms. Recently, has observed in many Dirac materials, which electron–electron correlation is relatively weak. The strongly...

Crystalline symmetries can generate exotic band-crossing features, which lead to unconventional fermionic excitations with interesting physical properties. We show how a cubic Dirac point---a fourfold-degenerate point dispersion in plane and linear the third direction---can be stabilized through presence of nonsymmorphic glide mirror symmetry space group crystal. Notably, our case appears on threefold axis, even though it has been believed previously that such only appear sixfold axis....

Dynamical quantum phase transitions (DQPTs), which refer to the criticality in time of a many-body system, have attracted much theoretical and experimental research interest recently. Despite that DQPTs are defined signaled by nonanalyticities Loschmidt rate, its interrelation with various correlation measures such as equilibrium order parameters system remains unclear. In this work, considering quench dynamics an interacting topological model, we find model general exhibit signatures around...

Dynamical quantum phase transitions (DQPTs) are criticalities in the time evolution of systems and their existence has been theoretically predicted experimentally observed. However, how system behaves vicinity DQPT its connection to physical observables remains an open question. In this work, we introduce concept Loschmidt amplitude spectrum (LAS), which extends Loscmidt - detector transition by considering overlap initial state all eigenstates prequench Hamiltonian. By analyzing LAS...

The short time evolution of a topological system after sudden quench is considered, calculating the Loschmidt rate and studying in detail distribution Fisher zeros. Singular behavior has been predicted found several systems and, particular, one dimension (1D) finds sharp features rate. These are associated with critical times that may be seen as imaginary part zeros, under condition their real vanishes. In complex plane lines zeros cross axis at certain points. 2D system, general, occupy...

We report results of magnetotransport measurements on KV$_3$Sb$_5$ thin flakes under pressure. Our zero-field electrical resistance reveals an additional anomaly emerging pressure ($p$), marking a previously unidentified phase boundary $T^{\rm \ast}$($p$). Together with the established $T_{\rm CDW}(p)$ and $T_c(p)$, denoting charge-density-wave transition superconducting transition, respectively, temperature-pressure diagram features rich interplay among multiple phases. The Hall coefficient...

Abstract Results of magnetotransport measurements are reported on KV 3 Sb 5 thin flakes under pressure. The zero‐field electrical resistance reveals an additional anomaly emerging pressure ( p ), marking a previously unidentified phase boundary T *( ). Together with the established CDW ) and c denoting charge‐density‐wave transition superconducting transition, respectively, temperature‐pressure diagram features rich interplay among multiple phases. Hall coefficient evolves reasonably...

In this work, we proposed a novel approach for identifying quantum phase transitions in one-dimensional many-body systems using AutoEncoder (AE), an unsupervised machine learning technique, with minimal prior knowledge. The training of the AEs is done reduced density matrix (RDM) data obtained by Exact Diagonalization (ED) across entire range driving parameter and thus no knowledge diagram required. With method, successfully detect wide models multiple different types, including topological...

In this paper, the as-cast microstructure, microsegregation, kinetics of secondary precipitation phase, and thermal deformation behavior in Ta-containing GH4151 alloy (Ta-GH4151) were studied using optical microscope (OM), scanning electron (SEM), probe (EPMA), differential calorimetry (DSC), mechanical testing simulation (MTS) backscattering diffraction (EBSD). The results indicate that Ti, Ta, Nb Mo are mainly distributed interdendritic region exhibit negative segregation characteristics,...

Ni-based superalloys with enhanced environmental resistance at high temperatures are crucial for advanced gas turbine engines. The new polycrystalline nickel-based superalloy has excellent mechanical properties, but as a low-Cr, high-alloying superalloy, its never been investigated. hot corrosion behavior of the under molten salt conditions and effect on tensile properties were investigated in this paper. results showed following: diffusion Cr, Al, Ni elements governs majority process,...

We study the fidelity susceptibility in two-dimensional (2D) transverse-field Ising model and 2D XXZ numerically. It is found that both models, as a function of driving parameter diverges at critical points. The validity to signal for quantum phase transition thus verified these two models. also compare scaling behavior extremum second derivative ground-state energy. From those results, theoretical argument more sensitive seeker second-order testified

The kagome metal CsV <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline" overflow="scroll"> <mml:msub> <mml:mrow/> <mml:mn>3</mml:mn> </mml:msub> </mml:math> Sb <mml:mn>5</mml:mn> is an ideal platform to study the interplay between topology and electron correlation. To understand fermiology of , intensive quantum oscillation (QO) studies at ambient pressure have been conducted. However, due Fermi surface reconstruction by complicated charge density wave (CDW) order, QO...

In this paper, we derive a simple equality that relates the spectral function $I(k,\omega)$ and fidelity susceptibility $\chi_F$, i.e. $% \chi_F=\lim_{\eta\rightarrow 0}\frac{\pi}{\eta} I(0, i\eta)$ with $\eta$ being half-width of resonance peak in function. Since can be measured experiments by neutron scattering or angle-resolved photoemission spectroscopy(ARPES) technique, our makes directly measurable experiments. Physically, reveals also actually denotes quantum criticality-like point at...

It has been recently proposed that the reduced density matrix may be used to derive order parameter of a condensed matter system. Here we propose parameters for phases topological insulator, specifically spinless Su-Schrieffer-Heeger (SSH) model, and consider effect short-range interactions. All derived their possible corresponding quantum are verified by entanglement entropy electronic configuration analysis results. The appropriate regions is further proved calculating Berry phase under...

Quantum phase transitions have long been studied in their relation to quantum fluctuations. These fluctuations can be quantified as the degree of spin squeezing models, where one two noncommutative observables breaks standard limit measurement by minimizing its uncertainty. However, understanding role dynamical (DQPTs) is still incomplete. In this work, we combine Loschmidt amplitude, which detects DQPTs, and spin-squeezing parameter (SSP), quantification squeezing, study dynamics a quenched...

The quasiskutterudite superconductor ${\mathrm{La}}_{3}{\mathrm{Co}}_{4}{\mathrm{Sn}}_{13}$ undergoes a phase transition at ${T}^{*}=152$ K. By measuring the temperature dependence of heat capacity, electrical resistivity, and superlattice reflection intensity using x rays, we explore character ${T}^{*}$. Our lattice dynamic calculations found imaginary phonon frequencies around $M$ point when high-temperature structure is used in calculations, indicating that unstable zero-temperature...

The bulk electronic structure of $T_d$-MoTe$_2$ features large hole Fermi pockets at the Brillouin zone center ($\Gamma$) and two electron surfaces along $\Gamma-X$ direction. However, pockets, whose existence has important implications for Weyl physics $T_d$-MoTe$_2$, never been conclusively detected in quantum oscillations. This raises doubt about realizability Majorana states because these exotic rely on points, which originated from same band predicted by density functional theory (DFT)....

Fidelity has been widely used to detect various types of quantum phase transitions (QPTs). However, challenges remain in locating the transition points with precision several models unconventional phases. We propose fidelity map approach QPTs higher accuracy and sensitivity than conventional measures. Our scheme extends concept from a single-dimensional multidimensional quantity uses metaheuristic algorithm search for critical that globally maximize within each phase. verify interacting...

We present microstructure and magnetic properties of Sm2(Fe, Si)17Cx/α-Fe nanocomposite magnets prepared under a pressure 4 GPa at temperature 923 K. A high-pressure experiment was carried out in belt-type apparatus. Analyses x-ray diffraction transmission electron microscopy show that the have grain size 6–8 nm, which provides strong exchange coupling between hard soft phases. As result, have, compared with normal pressure, significant increase both coercivity, from 132 to 500 kA/m,...

The quasiskutterudite superconductors ${A}_{3}{T}_{4}{\mathrm{Sn}}_{13}$ ($A=\text{Sr}$, Ca; $T=\text{Ir}$, Rh, Co) are highly tunable, featuring a structural quantum critical point. We construct temperature-lattice constant phase diagram for these isovalent compounds, establishing ${\mathrm{Ca}}_{3}{\mathrm{Rh}}_{4}{\mathrm{Sn}}_{13}$ and ${\mathrm{Ca}}_{3}{\mathrm{Co}}_{4}{\mathrm{Sn}}_{13}$ as members close to far away from the point, respectively. Deconvolution of lattice specific heat...

The band structure of high carrier density metal CrP features an interesting crossing at the Y point Brillouin zone. crossing, which is protected by nonsymmorphic symmetry space group, results in a hybrid, semi-Dirac-like energy-momentum dispersion relation near Y. linear along Y-$\Gamma$ reminiscent observed several semimetallic extremely large magnetoresistance (XMR) materials. We have measured transverse up to 14 T temperatures as low $\sim$ 16 mK. Our data reveal nonsaturating, quadratic...

Research on topological models unveils fascinating physics, especially in the realm of dynamical quantum phase transitions (DQPTs). However, understanding entanglement structures and properties near DQPT with longer-range hoppings is far from complete. In this work, we study DQPTs quenched extended Su-Schrieffer-Heeger model. Anomalous DQPTs, where number critical momenta exceeds winding differences between prequench postquench phases, are observed. We find that exhibits local maximum...