SciPost Physics最新文献_第8页

Conformal maps and superfluid vortex dynamics on curved and bounded surfaces: The case of an elliptical boundary 曲面和有界曲面上的共形映射和超流体涡旋动力学：椭圆边界的情况

IF 5.5 2区物理与天体物理

SciPost Physics Pub Date : 2024-08-08 DOI: 10.21468/scipostphys.17.2.039

Matteo Caldara, Andrea Richaud, Pietro Massignan, Alexander L. Fetter

引用次数: 0

Exact first-order effect of interactions on the ground-state energy of harmonically-confined fermions 相互作用对谐波约束费米子基态能量的精确一阶效应

IF 5.5 2区物理与天体物理

SciPost Physics Pub Date : 2024-08-07 DOI: 10.21468/scipostphys.17.2.038

Pierre Le Doussal, Naftali R. Smith, Nathan Argaman

{"title":"Exact first-order effect of interactions on the ground-state energy of harmonically-confined fermions","authors":"Pierre Le Doussal, Naftali R. Smith, Nathan Argaman","doi":"10.21468/scipostphys.17.2.038","DOIUrl":"https://doi.org/10.21468/scipostphys.17.2.038","url":null,"abstract":"We consider a system of $N$ spinless fermions, interacting with each other via a power-law interaction $epsilon/r^n$, and trapped in an external harmonic potential $V(r) = r^2/2$, in $d=1,2,3$ dimensions. For any $0 < n < d+2$, we obtain the ground-state energy $E_N$ of the system perturbatively in $epsilon$, $E_{N}=E_{N}^{≤ft(0)}+epsilon E_{N}^{≤ft(1)}+O≤ft(epsilon^{2})$. We calculate $E_{N}^{≤ft(1)}$ exactly, assuming that $N$ is such that the \"outer shell\" is filled. For the case of $n=1$ (corresponding to a Coulomb interaction for $d=3$), we extract the $N gg 1$ behavior of $E_{N}^{≤ft(1)}$, focusing on the corrections to the exchange term with respect to the leading-order term that is predicted from the local density approximation applied to the Thomas-Fermi approximate density distribution. The leading correction contains a logarithmic divergence, and is of particular importance in the context of density functional theory. We also study the effect of the interactions on the fermions' spatial density. Finally, we find that our result for $E_{N}^{≤ft(1)}$ significantly simplifies in the case where $n$ is even.","PeriodicalId":21682,"journal":{"name":"SciPost Physics","volume":"16 1","pages":""},"PeriodicalIF":5.5,"publicationDate":"2024-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141969157","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Majorana zero-modes in a dissipative Rashba nanowire 耗散拉什巴纳米线中的马约拉纳零模

IF 5.5 2区物理与天体物理

SciPost Physics Pub Date : 2024-08-07 DOI: 10.21468/scipostphys.17.2.036

Arnob Kumar Ghosh, Annica M. Black-Schaffer

引用次数: 0

Topological photonic band gaps in honeycomb atomic arrays 蜂巢原子阵列中的拓扑光子带隙

IF 5.5 2区物理与天体物理

SciPost Physics Pub Date : 2024-08-07 DOI: 10.21468/scipostphyscore.7.3.051

Pierre Wulles, Sergey E. Skipetrov

{"title":"Topological photonic band gaps in honeycomb atomic arrays","authors":"Pierre Wulles, Sergey E. Skipetrov","doi":"10.21468/scipostphyscore.7.3.051","DOIUrl":"https://doi.org/10.21468/scipostphyscore.7.3.051","url":null,"abstract":"lattice of two-level atoms coupled by the in-plane electromagnetic field may exhibit band gaps that can be opened either by applying an external magnetic field or by breaking the symmetry between the two triangular sublattices of which the honeycomb one is a superposition. We establish the conditions of band gap opening, compute the width of the gap, and characterize its topological property by a topological index (Chern number). The topological nature of the band gap leads to inversion of the population imbalance between the two triangular sublattices for modes with frequencies near band edges. It also prohibits a transition to the trivial limit of infinitely spaced, noninteracting atoms without closing the spectral gap. Surrounding the lattice by a Fabry-Pérot cavity with small intermirror spacing $d < pi/k_0$, where $k_0$ is the free-space wave number at the atomic resonance frequency, renders the system Hermitian by suppressing the leakage of energy out of the atomic plane without modifying its topological properties. In contrast, a larger $d$ allows for propagating optical modes that are built up due to reflections at the cavity mirrors and have frequencies inside the band gap of the free-standing lattice, thus closing the latter.","PeriodicalId":21682,"journal":{"name":"SciPost Physics","volume":"35 1","pages":""},"PeriodicalIF":5.5,"publicationDate":"2024-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141969101","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Theory of universal diode effect in three-terminal Josephson junctions 三端约瑟夫森结中的通用二极管效应理论

IF 5.5 2区物理与天体物理

SciPost Physics Pub Date : 2024-08-07 DOI: 10.21468/scipostphys.17.2.037

Jorge Luis Huamani Correa, Michal P. Nowak

{"title":"Theory of universal diode effect in three-terminal Josephson junctions","authors":"Jorge Luis Huamani Correa, Michal P. Nowak","doi":"10.21468/scipostphys.17.2.037","DOIUrl":"https://doi.org/10.21468/scipostphys.17.2.037","url":null,"abstract":"We theoretically study the superconducting diode effect in a three-terminal Josephson junction. The diode effect in superconducting systems is typically related to the presence of a difference in the critical currents for currents flowing in the opposite direction. We show that in multi-terminal systems this effect occurs naturally without the need of the presence of any spin interactions and is a result of the presence of a relative shift between the Andreev bound states carrying the supercurrent. On an example of a three-terminal junction, we demonstrate that the non-reciprocal current in one of the superconducting contacts can be induced by proper phase biasing of the other contacts, provided that there are at least two Andreev bound states in the system and the symmetry of the system is broken. This result is confirmed in numerical models describing the junctions in both the short- and long-regime. By optimizing the geometry of the junction, we show that the efficiency of the realized superconducting diode exceeds 35%. We relate our predictions to recent experiments on multi-terminal junctions, in which non-reciprocal supercurrents were observed.","PeriodicalId":21682,"journal":{"name":"SciPost Physics","volume":"3 1","pages":""},"PeriodicalIF":5.5,"publicationDate":"2024-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141969098","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

BPS Wilson loops in mass-deformed ABJM theory: Fermi gas expansions and new defect CFT data 质量变形 ABJM 理论中的 BPS 威尔逊环：费米气体展开和新的缺陷 CFT 数据

IF 5.5 2区物理与天体物理

SciPost Physics Pub Date : 2024-08-06 DOI: 10.21468/scipostphys.17.2.035

Elisabetta Armanini, Luca Griguolo, Luigi Guerrini

引用次数: 0

Numerical signatures of ultra-local criticality in a one dimensional Kondo lattice model 一维近藤晶格模型中超局部临界的数值特征

IF 5.5 2区物理与天体物理

SciPost Physics Pub Date : 2024-08-05 DOI: 10.21468/scipostphys.17.2.034

Alexander Nikolaenko, Ya-Hui Zhang

{"title":"Numerical signatures of ultra-local criticality in a one dimensional Kondo lattice model","authors":"Alexander Nikolaenko, Ya-Hui Zhang","doi":"10.21468/scipostphys.17.2.034","DOIUrl":"https://doi.org/10.21468/scipostphys.17.2.034","url":null,"abstract":"Heavy fermion criticality has been a long-standing problem in condensed matter physics. Here we study a one-dimensional Kondo lattice model through numerical simulation and observe signatures of local criticality. We vary the Kondo coupling $J_K$ at fixed doping x. At large positive $J_K$, we confirm the expected conventional Luttinger liquid phase with $2k_F=frac{1+x}{2}$ (in units of $2pi$), an analogue of the heavy Fermi liquid (HFL) in the higher dimension. In the $J_K ≤ 0$ side, our simulation finds the existence of a fractional Luttinger liquid (LL$star$) phase with $2k_F=frac{x}{2}$, accompanied by a gapless spin mode originating from localized spin moments, which serves as an analogue of the fractional Fermi liquid (FL$star$) phase in higher dimensions. The LL$star$ phase becomes unstable and transitions to a spin-gapped Luther-Emery (LE) liquid phase at small positive $J_K$. Then we mainly focus on the \"critical regime\" between the LE phase and the LL phase. Approaching the critical point from the spin-gapped LE phase, we often find that the spin gap vanishes continuously, while the spin-spin correlation length in real space stays finite and small. For a certain range of doping, in a point (or narrow region) of $J_K$, the dynamical spin structure factor obtained through the time-evolving block decimation (TEBD) simulation shows dispersion-less spin fluctuations in a finite range of momentum space above a small energy scale (around $0.035 J$) that is limited by the TEBD accuracy. All of these results are unexpected for a regular gapless phase (or critical point) described by conformal field theory (CFT). Instead, they are more consistent with exotic ultra-local criticality with an infinite dynamical exponent $z=+$. The numerical discovery here may have important implications on our general theoretical understanding of the strange metals in heavy fermion systems. Lastly, we propose to simulate the model in a bilayer optical lattice with a potential difference.","PeriodicalId":21682,"journal":{"name":"SciPost Physics","volume":"92 1","pages":""},"PeriodicalIF":5.5,"publicationDate":"2024-08-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141969100","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Long-range entanglement and topological excitations 长程纠缠和拓扑激元

IF 5.5 2区物理与天体物理

SciPost Physics Pub Date : 2024-08-05 DOI: 10.21468/scipostphyscore.7.3.050

Gianpaolo Torre, Jovan Odavić, Pierre Fromholz, Salvatore Marco Giampaolo, Fabio Franchini

引用次数: 0

Large deviations in the symmetric simple exclusion process with slow boundaries: A hydrodynamic perspective 具有慢边界的对称简单排斥过程中的大偏差：流体力学视角

IF 5.5 2区物理与天体物理

SciPost Physics Pub Date : 2024-08-05 DOI: 10.21468/scipostphys.17.2.033

Soumyabrata Saha, Tridib Sadhu

引用次数: 0

How open is the asteroid-mass primordial black hole window? 小行星质量原始黑洞窗口的开放程度如何？

IF 5.5 2区物理与天体物理

SciPost Physics Pub Date : 2024-08-02 DOI: 10.21468/scipostphys.17.2.032

Matthew Gorton, Anne Green

引用次数: 0