2D gravity+1D matter

We consider a formulation of nonperturbative two-dimensional quantum gravity coupled to a single bosonic field (d=1 matter). Starting from a matrix realization of the discretized model, we express the continuum theory as a double scaling limit in which the 2D cosmological constant g tends towards a critical value g_c, and the string coupling 1/N→0, with the scaling parameter ∝1n (g-g_c)/(g-g_c)N held fixed. We find that in this formulation logarithmic corrections already present at tree level persist to all higher genus, suggesting a behavior different from the previously considered cases of d<1 matter.     

Collision-induced fundamental band of D2 in D2He and D2Ne mixtures at different temperatures

The collision-induced enhancement absorption spectra of deuterium in its fundamental region in D₂He at 77, 195, and 273 K and in D₂Ne at 77, 195, 273, and 298 K have been recorded with an absorption path length of 26 cm for gas densities up to 670 amagat for several base densities of deuterium. At each experimental temperature, binary and ternary absorption coefficients for the fundamental band were derived from the measured integrated intensities. The theory of the “exponential-4” model for the induced dipole moment of the colliding pair of molecules was applied to the binary absorption coefficients. The overlap parts of these coefficients were obtained by subtracting the calculated quadrupolar parts from the experimental values. The magnitude parameter λ, and the range ?, of the overlap part of the induced dipole moment, were determined for the colliding molecular pairs D₂He and D₂Ne by obtaining the best fit of the calculated overlap part of the binary absorption coefficients as a function of temperature to the experimental values of the overlap part. Derived parameters λ, ?, and the overlap induced dipole moment μ(σ) (at the Lennard-Jones intermolecular diameter σ) for D₂He and D₂Ne are as follows.

     

3.

Nanoimprint lithography: 2D or not 2D? A review     

Helmut Schift 《Applied Physics A: Materials Science & Processing》2015,121(2):415-435

     

4.

Relative equilibria of D2H + and H2D+     

I. N. KOZIN  R. M. ROBERTS  J. TENNYSON 《Molecular physics》2013,111(5):295-307

Relative equilibria of molecules are classical trajectories corresponding to steady rotations about stationary axes during which the shape of the molecule does not change. They can be used to explain and predict features of quantum spectra at high values of the total angular momentum J in much the same way that absolute equilibria are used at low J. This paper gives a classification of the symmetry types of relative equilibria of AB₂ molecules and computes the relative equilibria bifurcation diagrams and normal mode frequencies for D₂H⁺ and H₂D⁺. These are then fed into a harmonic quantization procedure to produce a number of predictions concerning the structures of energy level clusters and their rearrangements as J increases. In particular the formation of doublet pairs is predicted for H₂D⁺ from J ≈ 26.     

5.

Imaging 2D turbulence     

P. Vorobieff  M. Rivera  R. E. Ecke 《显形杂志》2001,3(4):323-330

     

6.

Comparison of 2D S-Transform Profilometry and 2D Windowed Fourier Transform Profilometry     

Wenjing Chen  Qiuju Shen  Min Zhong 《Optik》2013,124(24):6732-6736

Both two-dimensional (2D) Windowed Fourier Transform and 2D S Transform are popular time–frequency analysis tools for processing signals. But fewer articles reported the application of 2D S Transform in Fringe pattern analysis. This paper studies the 2D S Transform and compares it with 2D Windowed Fourier Transform. The phase calculation formula based on the 2D Windowed Fourier Transform “ridge” coefficients and 2D S Transform “ridge” coefficients are deduced respectively. A comparison between them is carried out to show their own characteristic in fringe patterns analysis based on the structured-light illumination. It verifies that the 3D reconstruction result of 2D ST is better than that of 2D WFT because of the employment of the adjusted windows by frequency parameters.     

7.

2D Kac-Moody symmetry of 4D Yang-Mills theory     

Temple He  Prahar Mitra  Andrew Strominger 《Journal of High Energy Physics》2016,2016(10):137

     

8.

Mobility-aware coded caching in D2D communication networks     

《Physical Communication》2023

In this paper, we consider a cache-enable device-to-device (D2D) communication network with user mobility and design a mobility-aware coded caching scheme to exploit multicasting opportunities for reducing network traffic. In addition to the static cache memory that can be used to reap coded caching gains, we assign a dynamic cache memory to mobile users such that users who never meet can still exchange contents via relaying. We consider content exchange as an information flow among dynamic cache memories of mobile users and leverage network coding to reduce network traffic. Specifically, we transfer our storage and broadcast problem into a network coding problem. By solving the formulated network coding problem, we obtain a dynamic content replacement and broadcast strategy. Numerical results verify that our algorithm significantly outperforms the random and greedy algorithms in terms of the amount of broadcasting data, and the standard Ford–Fulkerson algorithm in terms of the successful decoding ratio.     

9.

Magnetic fields in 2D and 3D sphere     

Jose L. Cabrerizo 《Journal of Nonlinear Mathematical Physics》2013,20(3):440-450

In this note we study the Landau–Hall problem in the 2D and 3D unit sphere, that is, the motion of a charged particle in the presence of a static magnetic field. The magnetic flow is completely determined for any Riemannian surface of constant Gauss curvature, in particular, the unit 2D sphere. For the 3D case we consider Killing magnetic fields on the unit sphere, and we show that the magnetic flowlines are helices with the given Killing vector field as its axis.     

10.

Critical conditions for 1D, 2D and 3D magnetic-bipolaron formation     

A. V. Kavokin  S. V. Goupalov 《Il Nuovo Cimento D》1995,17(11-12):1527-1530

     

11.

Critical conditions for 1D, 2D and 3D magnetic-bipolaron formation     

Kavokin  A. V.  Goupalov  S. V. 《Il Nuovo Cimento D》1995,17(11):1527-1530

Il Nuovo Cimento D - Interaction of two magnetic polarons formed either by single carriers or by excitons is considered in bulk crystal, quantum well and quantum wire. It is shown that the magnetic...     

12.

Comparison of 1D, 2D and 3D quench onset simulations     

A. Stenvall  R. Mikkonen  P. Ková? 《Physica C: Superconductivity and its Applications》2010,470(22):2047-2050

Measured and simulated minimum quench energies (MQE) for short samples are doubtful when estimating disturbance tolerance of an impregnated superconducting magnet. If measurements are performed at liquid cryogen, the cooling provided by the cryogen causes MQE to be high. At a conduction-cooled system, the transverse heat conduction is neglected causing low MQE. Even though these conditions can be artificially brought closer to the ones in an impregnated magnet, it is difficult to estimate by short-sample measurement the MQE of a superconducting coil. These similar difficulties are present at simulations. On the other hand, 1D and 2D measurements and simulations can be used, e.g., to compare wires or consider effect of insulation layer thickness, but according to the results only in a rough quantitative way. In this paper, we compare MQE and normal zone propagation velocity simulations of an MgB₂ wire with 1D, 2D and 3D finite element method models to focus on the different results given by the models employing different dimensions.     

13.

2D and Quasi‐2D Halide Perovskites: Applications and Progress     

Hyojung Kim  Kim Anh Huynh  Soo Young Kim  Quyet Van Le  Ho Won Jang 《固体物理学:研究快报》2020,14(2)

     

14.

变角二维谱实验     

傅日强  叶朝辉 《波谱学杂志》1990,7(3):313-319

本文描述了用同步驱动控制电路的变角机构,在Bruker WP-80谱仪上实现固体变角方法的二维谱实验。应用该变角机构,获得了固体粉末的化学位移各向同性和各向异性的二维分解谱。     

15.

Multisliced ultrafast 2D relaxometry     

Luca Venturi  Joshua Warner  Brian Hills 《Magnetic resonance imaging》2010,28(7):964-970

By associating each slice in a spatially homogeneous sample with a different inversion-recovery delay time, multislice methods are used to reduce the acquisition times of 2D inversion-recovery T₁-T₂ relaxation spectra to just a few minutes. The increased speed comes at the expense of reduced signal/noise and this is reflected most noticeably in shifts in the component longitudinal relaxation times. Nevertheless, the major features of the 2D relaxation spectra are reproduced.     

16.

Unparticle example in 2D     

Georgi H  Kats Y 《Physical review letters》2008,101(13):131603

We discuss what can be learned about unparticle physics by studying simple quantum field theories in one space and one time dimension. We argue that the exactly soluble 2D theory of a massless fermion coupled to a massive vector boson, the Sommerfield model, is an interesting analog of a Banks-Zaks model, approaching a free theory at high energies and a scale-invariant theory with nontrivial anomalous dimensions at low energies. We construct a toy standard model coupling to the fermions in the Sommerfield model and study how the transition from unparticle behavior at low energies to free particle behavior at high energies manifests itself in interactions with the toy standard model particles.     

17.

A 2D Luttinger Model     

Edwin Langmann 《Journal of statistical physics》2010,141(1):17-52

A detailed derivation of a two dimensional (2D) low energy effective model for spinless fermions on a square lattice with local interactions is given. This derivation utilizes a particular continuum limit that is justified by physical arguments. It is shown that the effective model thus obtained can be treated by exact bosonization methods. It is also discussed how this effective model can be used to obtain physical information about the corresponding lattice fermion system.     

18.

钪原子的自电离里德伯能级3d4s(~1D_2)nf~2D_(3/2),3d4s(~1D_2)nf~2F_(5/2)和3d4s(~1D_2)np~2D_(3/2)的理论研究          下载免费PDF全文

张新峰  范士林  贾凤东  薛平  许祥源  钟志萍 《物理学报》2010,59(9)

在多通道量子亏损理论框架下,利用相对论多通道理论,分别在冻结实近似和考虑偶极极化下计算钪原子的Jπ=(3/2)-,(5/2)-的三个收敛于[Ar]3d4s(1D2)的自电离里德伯系列的能级.对3d4s(1D2)np2D3/2和3d4s(1D2)nf2F5/2这两个系列,计算结果表明,考虑偶极极化效应后,理论计算和实验测量的量子数亏损之差普遍小于0.01.而对3d4s(1D2)nf2D3/2系列,考虑偶极极化效应后的结果和仅考虑冻结实的结果比较接近,理论计算和实验测量的量子数亏损之差普遍在0.04左右.     

19.

SDW in the 2D Compound CuFeTe2     

A. Rivas  F. Gonzalez-Jimenez  L. D'Onofrio  E. Jaimes  M. Quintero  J. Gonzalez 《Hyperfine Interactions》2001,134(1):115-122

In a previous work (ICAME'97) we presented the Mössbauer results for a non-stoichiometric sample of the quasi-two-dimensional (2D) dichalcogenide CuFeTe₂, where a Spin Density Wave (SDW) ground state with T _SDW=256±15 K was proposed. Here we report the study of the magnetic and electric properties determined by magnetic susceptibility, Mössbauer spectroscopy and resistance measurements, of an almost stoichiometric sample prepared by the vertical Bridgman growth technique. The SDW behavior is supported by the results obtained by the following different techniques: Magnetic susceptibility: A magnetic transition is observed at T _SDW=308 K with a Pauli paramagnetic behavior above this temperature. Mössbauer effect: The shape of the spectra and the thermal evolution of the hyperfine field are characteristic of the SDW's in quasi-2D systems. Electrical resistance: There is a metal–semiconductor transition along the layers as the temperature decreases indicating the opening of a gap at the Fermi level.     

20.

1D/2D material-based photodetectors driven by ferroelectrics     

Feng-Xia Liang  Lin-Bao Luo 《中国科学:物理学 力学 天文学(英文版)》2017,60(3):037031

<正>One-dimensional (1D) and two-dimensional (2D) materials,such as nanowires,graphene,and transition metal dichalcogenides (TMDs),have received emerging research study in the past ten years [1-3].They have demonstrated to be idea building blocks for fabricating high-performance photodetector devices owing to their unique electrical and optical properties[4-6].However,the photoresponsivity,detectivity,and     

Mixture	λ	?	μ(σ)
D2He	4.7 × 10?3	0.24 Å	2.55 × 10?2 ea0
D2Ne	8.5 × 10?3	0.26 Å	4.56 × 10?2 ea0

Relative equilibria of D2H + and H2D+

Relative equilibria of molecules are classical trajectories corresponding to steady rotations about stationary axes during which the shape of the molecule does not change. They can be used to explain and predict features of quantum spectra at high values of the total angular momentum J in much the same way that absolute equilibria are used at low J. This paper gives a classification of the symmetry types of relative equilibria of AB₂ molecules and computes the relative equilibria bifurcation diagrams and normal mode frequencies for D₂H⁺ and H₂D⁺. These are then fed into a harmonic quantization procedure to produce a number of predictions concerning the structures of energy level clusters and their rearrangements as J increases. In particular the formation of doublet pairs is predicted for H₂D⁺ from J ≈ 26.     

Comparison of 2D S-Transform Profilometry and 2D Windowed Fourier Transform Profilometry

Both two-dimensional (2D) Windowed Fourier Transform and 2D S Transform are popular time–frequency analysis tools for processing signals. But fewer articles reported the application of 2D S Transform in Fringe pattern analysis. This paper studies the 2D S Transform and compares it with 2D Windowed Fourier Transform. The phase calculation formula based on the 2D Windowed Fourier Transform “ridge” coefficients and 2D S Transform “ridge” coefficients are deduced respectively. A comparison between them is carried out to show their own characteristic in fringe patterns analysis based on the structured-light illumination. It verifies that the 3D reconstruction result of 2D ST is better than that of 2D WFT because of the employment of the adjusted windows by frequency parameters.     

Mobility-aware coded caching in D2D communication networks

In this paper, we consider a cache-enable device-to-device (D2D) communication network with user mobility and design a mobility-aware coded caching scheme to exploit multicasting opportunities for reducing network traffic. In addition to the static cache memory that can be used to reap coded caching gains, we assign a dynamic cache memory to mobile users such that users who never meet can still exchange contents via relaying. We consider content exchange as an information flow among dynamic cache memories of mobile users and leverage network coding to reduce network traffic. Specifically, we transfer our storage and broadcast problem into a network coding problem. By solving the formulated network coding problem, we obtain a dynamic content replacement and broadcast strategy. Numerical results verify that our algorithm significantly outperforms the random and greedy algorithms in terms of the amount of broadcasting data, and the standard Ford–Fulkerson algorithm in terms of the successful decoding ratio.     

Magnetic fields in 2D and 3D sphere

In this note we study the Landau–Hall problem in the 2D and 3D unit sphere, that is, the motion of a charged particle in the presence of a static magnetic field. The magnetic flow is completely determined for any Riemannian surface of constant Gauss curvature, in particular, the unit 2D sphere. For the 3D case we consider Killing magnetic fields on the unit sphere, and we show that the magnetic flowlines are helices with the given Killing vector field as its axis.     

Critical conditions for 1D, 2D and 3D magnetic-bipolaron formation

Il Nuovo Cimento D - Interaction of two magnetic polarons formed either by single carriers or by excitons is considered in bulk crystal, quantum well and quantum wire. It is shown that the magnetic...     

Comparison of 1D, 2D and 3D quench onset simulations

Measured and simulated minimum quench energies (MQE) for short samples are doubtful when estimating disturbance tolerance of an impregnated superconducting magnet. If measurements are performed at liquid cryogen, the cooling provided by the cryogen causes MQE to be high. At a conduction-cooled system, the transverse heat conduction is neglected causing low MQE. Even though these conditions can be artificially brought closer to the ones in an impregnated magnet, it is difficult to estimate by short-sample measurement the MQE of a superconducting coil. These similar difficulties are present at simulations. On the other hand, 1D and 2D measurements and simulations can be used, e.g., to compare wires or consider effect of insulation layer thickness, but according to the results only in a rough quantitative way. In this paper, we compare MQE and normal zone propagation velocity simulations of an MgB₂ wire with 1D, 2D and 3D finite element method models to focus on the different results given by the models employing different dimensions.     

变角二维谱实验

本文描述了用同步驱动控制电路的变角机构,在Bruker WP-80谱仪上实现固体变角方法的二维谱实验。应用该变角机构,获得了固体粉末的化学位移各向同性和各向异性的二维分解谱。     

Multisliced ultrafast 2D relaxometry

By associating each slice in a spatially homogeneous sample with a different inversion-recovery delay time, multislice methods are used to reduce the acquisition times of 2D inversion-recovery T₁-T₂ relaxation spectra to just a few minutes. The increased speed comes at the expense of reduced signal/noise and this is reflected most noticeably in shifts in the component longitudinal relaxation times. Nevertheless, the major features of the 2D relaxation spectra are reproduced.     

Unparticle example in 2D

We discuss what can be learned about unparticle physics by studying simple quantum field theories in one space and one time dimension. We argue that the exactly soluble 2D theory of a massless fermion coupled to a massive vector boson, the Sommerfield model, is an interesting analog of a Banks-Zaks model, approaching a free theory at high energies and a scale-invariant theory with nontrivial anomalous dimensions at low energies. We construct a toy standard model coupling to the fermions in the Sommerfield model and study how the transition from unparticle behavior at low energies to free particle behavior at high energies manifests itself in interactions with the toy standard model particles.     

A 2D Luttinger Model

A detailed derivation of a two dimensional (2D) low energy effective model for spinless fermions on a square lattice with local interactions is given. This derivation utilizes a particular continuum limit that is justified by physical arguments. It is shown that the effective model thus obtained can be treated by exact bosonization methods. It is also discussed how this effective model can be used to obtain physical information about the corresponding lattice fermion system.     

钪原子的自电离里德伯能级3d4s(~1D_2)nf~2D_(3/2),3d4s(~1D_2)nf~2F_(5/2)和3d4s(~1D_2)np~2D_(3/2)的理论研究

在多通道量子亏损理论框架下,利用相对论多通道理论,分别在冻结实近似和考虑偶极极化下计算钪原子的Jπ=(3/2)-,(5/2)-的三个收敛于[Ar]3d4s(1D2)的自电离里德伯系列的能级.对3d4s(1D2)np2D3/2和3d4s(1D2)nf2F5/2这两个系列,计算结果表明,考虑偶极极化效应后,理论计算和实验测量的量子数亏损之差普遍小于0.01.而对3d4s(1D2)nf2D3/2系列,考虑偶极极化效应后的结果和仅考虑冻结实的结果比较接近,理论计算和实验测量的量子数亏损之差普遍在0.04左右.     

SDW in the 2D Compound CuFeTe2

In a previous work (ICAME'97) we presented the Mössbauer results for a non-stoichiometric sample of the quasi-two-dimensional (2D) dichalcogenide CuFeTe₂, where a Spin Density Wave (SDW) ground state with T _SDW=256±15 K was proposed. Here we report the study of the magnetic and electric properties determined by magnetic susceptibility, Mössbauer spectroscopy and resistance measurements, of an almost stoichiometric sample prepared by the vertical Bridgman growth technique. The SDW behavior is supported by the results obtained by the following different techniques: Magnetic susceptibility: A magnetic transition is observed at T _SDW=308 K with a Pauli paramagnetic behavior above this temperature. Mössbauer effect: The shape of the spectra and the thermal evolution of the hyperfine field are characteristic of the SDW's in quasi-2D systems. Electrical resistance: There is a metal–semiconductor transition along the layers as the temperature decreases indicating the opening of a gap at the Fermi level.     

1D/2D material-based photodetectors driven by ferroelectrics

<正>One-dimensional (1D) and two-dimensional (2D) materials,such as nanowires,graphene,and transition metal dichalcogenides (TMDs),have received emerging research study in the past ten years [1-3].They have demonstrated to be idea building blocks for fabricating high-performance photodetector devices owing to their unique electrical and optical properties[4-6].However,the photoresponsivity,detectivity,and