Article
Physics, Multidisciplinary
Clement De Daniloff, Marin Tharrault, Cedric Enesa, Christophe Salomon, Frederic Chevy, Thomas Reimann, Julian Struck
Summary: We studied ensembles of fermionic cold-atom quantum wires with tunable transverse mode population and single-wire resolution. By controlling the temperature and atom number, we were able to observe the 1D-3D crossover and investigate the equilibrium and transport properties of strongly interacting 1D Fermi gases.
PHYSICAL REVIEW LETTERS
(2021)
Article
Materials Science, Multidisciplinary
Alexandros Metavitsiadis, Wolfram Brenig
Summary: The study focuses on the self-localization and possible delocalization mechanisms of the Kitaev spin-1/2 ladder model. It is found that the influence of magnetic fields on the system is achieved through flux mobility, with flux mobility being the key to entering a delocalized state.
Article
Materials Science, Multidisciplinary
Conor Stevenson, Bernd Braunecker
Summary: It is shown that in a quantum wire with a local asymmetric scattering potential, the principal channels for charge and heat transport decouple and renormalize differently under electron interactions, with heat transport generally being more relevant. The polarization of the rectification results from quantum interference and can be tuned through external gating. Additionally, for spin-polarized or helical electrons with strong interactions, a regime can be achieved where heat transport is strongly rectified while charge rectification is weak.
Article
Chemistry, Physical
H. Fabrelli, A. P. Vieira, A. Paduan-Filho, R. S. Freitas
Summary: Through experimental and theoretical techniques, a study on the spin-1 field-induced antiferromagnet NiCl2-4SC(NH2)(2) was conducted to delimit the Tomonaga-Luttinger liquid region and verify discrepancies in the value of the single-ion anisotropy parameter D.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Multidisciplinary
Xin Lu, Dai-Wei Qu, Yang Qi, Wei Li, Shou-Shu Gong
Summary: Inspired by recent studies on the t-J model, we systematically investigate the phase diagram of a two-leg t-J ladder with next-nearest-neighbor (NNN) couplings. We identify a Luther-Emery liquid (LEL) phase and two different Tomonaga-Luttinger liquid (TLL) phases, and find that the NNN couplings play a similar role as in the wider t-J cylinder. Our results provide insights into the emergence of the remarkable d-wave superconducting phase in the wider system.
Article
Physics, Multidisciplinary
Xinghai Zhang, Matthew S. Foster
Summary: This study explores quantum quenches of helical liquids with spin-flip inelastic scattering, revealing two types of strongly nonlinear wave dynamics caused by localized hot spots formed due to scattering. The experimental results suggest potential for verification through the detection of frequency doubling from emitted terahertz radiation.
PHYSICAL REVIEW LETTERS
(2021)
Article
Materials Science, Multidisciplinary
Moallison F. Cavalcante, Rodrigo G. Pereira, Maria C. O. Aguiar
Summary: We investigate the dynamics of the Kondo effect in a system of two metallic Hubbard chains coupled to a magnetic impurity after a quantum quench. For noninteracting electrons, the charge current across the impurity is determined by a scaling function involving the Kondo time. In the case of interacting electrons, we observe a decrease in the Kondo time with increasing repulsive interaction strength, and the time dependence of the current exhibits characteristics of the Kondo effect in a Luttinger liquid. Our findings emphasize the significance of nonequilibrium dynamics in studying quantum impurities in interacting systems.
Article
Energy & Fuels
G. Veerapandi, S. Prabhu, R. Ramesh, R. Govindan, C. Sekar
Summary: This study investigates the application of pseudo spin-ladder CaCu2O3 nanostructures as efficient electrodes for high-performance asymmetric supercapacitors. The results demonstrate that CaCu2O3-based supercapacitors exhibit high specific capacitance and excellent cyclic stability, making them potential candidates for high-energy storage applications.
JOURNAL OF ENERGY STORAGE
(2022)
Article
Materials Science, Multidisciplinary
Imke Schneider, Ipsita Mandal, Polina Matveeva, Dominik Strassel, Sebastian Eggert
Summary: The asymptotic dynamical correlation functions in one-dimensional spin chains follow power laws, with corresponding exponents characterizing different bulk and boundary critical behavior. Results for the logarithmic contribution to boundary correlations in an isotropic Heisenberg chain are presented, and the logarithm exponent of λ = 1 is derived using renormalization group technique. Analytical results are confirmed by comparison with numerical quantum Monte Carlo data.
Article
Materials Science, Multidisciplinary
Balazs Dora, Miklos Antal Werner, Catalin Pascu Moca
Summary: The quantum quench dynamics of the interacting Hatano-Nelson model with open boundary conditions is investigated using Abelian bosonization and numerical methods. The evolution of particle density and current profile in real space over time is followed by turning on or off the imaginary vector potential in the presence of weak interactions. The results show spatiotemporal Friedel oscillations with light cones propagating ballistically from the open ends, accompanied by local currents of equal magnitude for both switching protocols. The bosonization method accurately describes the density and current patterns with a single overall fitting parameter. The continuity equation is satisfied by the long-wavelength part of the density and current, despite the nonunitary time evolution when the Hatano-Nelson term is switched on.
Article
Quantum Science & Technology
Yichen Hu, Biao Lian
Summary: We investigate the homogeneous chiral edge theory of the filling v = 4/3 fractional quantum Hall state, and identify two solvable cases. We find that the energy spectrum shows Poisson level spacing statistics and can transition to Wigner-Dyson with the inclusion of a global symmetry preserving irrelevant nonlinear kinetic term.
Article
Materials Science, Multidisciplinary
Yoshiki Fukusumi, Shumpei Iino
Summary: The study demonstrates that a one-dimensional quantum Ising model with multiple topological defects can be transformed into the same model with boundary magnetic fields and noninteracting boundary degrees of freedom. The appearance of a linear combination of Cardy states as an edge state is shown, indicating protection under bulk perturbation but fragility to boundary perturbation. The formulation suggests the existence of nontrivial edge physics under the presence of topological defects, opening up new avenues for future analysis related to boundary and bulk physics.
Article
Multidisciplinary Sciences
Ruwan Senaratne, Danyel Cavazos-Cavazos, Sheng Wang, Feng He, Ya-Ting Chang, Aashish Kafle, Han Pu, Xi-Wen Guan, Randall G. Hulet
Summary: Confining ultracold atoms to periodic potentials is a powerful method for simulating complex many-body systems. In this study, we confined fermions to one dimension to realize the Tomonaga-Luttinger liquid model and observed a velocity shift of spin and charge excitations in opposite directions, indicating the existence of spin-charge separation.
Article
Optics
Omar Abel Rodriguez-Lopez, M. A. Solis, J. Boronat
Summary: We study the structural superfluid-Mott-insulator quantum phase transition of an interacting one-dimensional Bose gas within multirod lattices, and use the ab initio diffusion Monte Carlo method to calculate relevant parameters. We find that varying the width of barriers from zero to the length of the potential period can induce the SF-MI phase transition.
Article
Multidisciplinary Sciences
Jagannath Jena, Borge Gobel, Tomoki Hirosawa, Sebastian A. Diaz, Daniel Wolf, Taichi Hinokihara, Vivek Kumar, Ingrid Mertig, Claudia Felser, Axel Lubk, Daniel Loss, Stuart S. P. Parkin
Summary: Recent experiments have observed the formation and stability of fractional antiskyrmions and fractional elliptical skyrmions at the edges of a Heusler material. These fractional spin textures coexist with nano-objects with integer topological charges within the sample. The ability of these objects to continuously vary their topological charges in the presence of magnetic fields makes them a unique state of matter and a promising platform for spintronic and magnonic applications in the Heusler family of compounds.
NATURE COMMUNICATIONS
(2022)
Article
Physics, Multidisciplinary
A. -M Visuri, T. Giamarchi, C. Kollath
Summary: This paper studies particle transport through a chain of coupled sites connected to free-fermion reservoirs at both ends, with a local particle loss. The conductance and particle density in the steady state are calculated using the Keldysh formalism for open quantum systems. In addition to a reduction in conductance, it is found that transport can remain (almost) unaffected by the loss for certain values of the chemical potential in the lattice. It is shown that this protected transport is a result of the spatial symmetry of single-particle eigenstates. At a finite voltage, the density profile develops a drop at the lossy site, connected to the onset of nonballistic transport.
PHYSICAL REVIEW LETTERS
(2022)
Article
Materials Science, Multidisciplinary
Kyle T. Kluherz, Sebastian T. Mergelsberg, David E. Sommer, Joo Yeon D. Roh, Sarah A. Saslow, Daniel Biner, Karl W. Kramer, Scott T. Dunham, James J. De Yoreo, Daniel R. Gamelin
Summary: Ytterbium doping in all-inorganic lead-halide perovskites generates interesting properties and this study provides a detailed understanding of the local doping structures and charge compensation mechanisms.
PHYSICAL REVIEW MATERIALS
(2022)
Article
Optics
Shintaro Takayoshi, Thierry Giamarchi
Summary: We study the transport properties of a one-dimensional quantum system with disorder and compute the frequency dependence of its conductivity using numerical methods. The results show that the conductivity decays as a power law at high frequencies and follows a linear behavior at low frequencies, with both behaviors being affected by the interaction strength. The localization length also exhibits a power law dependence on the disorder strength, in agreement with theoretical predictions. These findings have implications for experiments with cold atomic gases.
EUROPEAN PHYSICAL JOURNAL D
(2022)
News Item
Physics, Multidisciplinary
Vivien S. Zapf, Minseong Lee, Priscila F. S. Rosa
Summary: Spin ices are lattice structures with magnetic moments that can have multiple ground-state configurations. Quantum effects can cause the spin ice to transition into a liquid state, even at absolute zero, where no static order is formed despite strong interactions.
Article
Physics, Multidisciplinary
Meng-Zi Huang, Jeffrey Mohan, Anne -Maria Visuri, Philipp Fabritius, Mohsen Talebi, Simon Wili, Shun Uchino, Thierry Giamarchi, Tilman Esslinger
Summary: We measure the superfluid transport of strongly interacting fermionic lithium atoms through a quantum point contact by utilizing local, spin-dependent particle loss. We find that the characteristic non-Ohmic superfluid transport, enabled by high-order multiple Andreev reflections, transitions into an excess Ohmic current when the dissipation strength exceeds the superfluid gap. Our developed model, which includes mean-field reservoirs connected to a dissipative site via tunneling, reproduces the observed nonequilibrium particle current in the Keldysh formalism, but it does not fully explain the observed loss rate or spin current.
PHYSICAL REVIEW LETTERS
(2023)
Article
Physics, Multidisciplinary
Hugo Cayla, Pietro Massignan, Thierry Giamarchi, Alain Aspect, Christoph I. Westbrook, David Clement
Summary: We measured the momentum density in a Bose-Einstein condensate (BEC) with dilute spin impurities and observed algebraic tails decaying as 1/k4 at large momentum k, which originated from impurity-BEC interactions. The amplitudes of these tails exceeded those expected from two-body contact interactions at equilibrium in the trap. These unexpected algebraic tails were found to originate from the nontrivial dynamics of the expansion in the presence of impurity-bath interactions.
PHYSICAL REVIEW LETTERS
(2023)
Article
Physics, Multidisciplinary
Gunnar Bollmark, Thomas Kohler, Lorenzo Pizzino, Yiqi Yang, Johannes S. Hofmann, Hao Shi, Shiwei Zhang, Thierry Giamarchi, Adrian Kantian
Summary: Correlated electron states are crucial for understanding unconventional superconductivity. However, calculating their properties accurately remains a challenge. In this work, we propose a framework combining matrix product states (MPS) with mean field (MF) to compute the properties of quasi-one-dimensional (Q1D) systems. We demonstrate the effectiveness of this framework by calculating the critical temperature for superconductivity in Q1D fermions. This approach allows for the quantitative study of correlated phases and the treatment of competing macroscopic orders.
Article
Multidisciplinary Sciences
T. -W. Zhou, G. Cappellini, D. Tusi, L. Franchi, J. Parravicini, C. Repellin, S. Greschner, M. Inguscio, T. Giamarchi, M. Filippone, J. Catani, L. Fallani
Summary: The Hall effect, which describes the motion of charged particles in magnetic fields, has important implications for material properties. Understanding this effect in interacting systems is challenging, even for small magnetic fields. In this study, we used an atomic quantum simulator to investigate the behavior of ultracold fermions in the presence of artificial magnetic fields. Through experimental measurements, we observed a universal behavior of the Hall response, which is independent of the strength of atomic interactions. This research demonstrates the capability of quantum simulation to describe strongly correlated topological states of matter.
Article
Materials Science, Multidisciplinary
L. Herviou, S. Capponi, P. Lecheminant
Summary: The zero-temperature phase diagram of the J1-J2 SU(N) antiferromagnetic Heisenberg spin chain is studied for general N using field theory and numerical methods. A fully gapped SU(N) valence bond solid is formed for all N above a critical value of J2/J1. The extension of this N-merized phase for larger J2 strongly depends on the parity of N. For odd N, a gapless phase in the SU(N)1 universality class is stabilized for larger J2, while for even N, the phase smoothly interpolates to a zigzag SU(N) two-leg spin ladder phase.
Article
Materials Science, Multidisciplinary
Tony Jin, Paola Ruggiero, Thierry Giamarchi
Summary: We derive the bosonization of the interacting fermionic Su-Schrieffer-Heeger (SSH) model with open boundaries and use it to quantitatively describe the edge modes of the system. Our results show excellent agreement with numerical simulations, particularly in terms of the localization of the zero-energy edge mode near the boundaries. Interestingly, we find that the effects of repulsive or attractive interactions on the edge mode localization depend on the staggering parameter. We provide quantitative predictions of these effects on the localization length of the edge mode and suggest that bosonization can be generalized to other models.
Article
Materials Science, Multidisciplinary
Saptarshi Majumdar, Laura Foini, Thierry Giamarchi, Alberto Rosso
Summary: We study an XXZ spin chain coupled to an ohmic bath of harmonic oscillators at zero temperature. Two phases, separated by a Kosterlitz-Thouless transition, are found: a Luttinger liquid phase with finite spin stiffness at low coupling and a dissipative phase with vanishing spin stiffness at high coupling. The transport properties are also affected, with the Luttinger liquid phase being a perfect conductor and the dissipative phase showing finite resistivity. The effect of the bath can be interpreted as annealed disorder-inducing signatures of localization.
Article
Physics, Multidisciplinary
Q. Faure, C. D. Dashwood, C. V. Colin, R. D. Johnson, E. Ressouche, G. B. G. Stenning, J. Spratt, D. F. McMorrow, R. S. Perry
Summary: We present a comprehensive experimental investigation of the magnetic structure in Ca(3)Ru(2)O7, revealing its phase diagram and spin reorientation transition. The results show that the magnetic moments form a cycloid in the a-b plane with a propagation wave vector of (8, 0, 1) and an ordered moment of about 1 mu B at temperatures between 46.7 K and 49.0 K. The applied magnetic field causes the eccentricity of the cycloid and the wave vector to increase, suggesting an enhancement of the antisymmetric Dzyaloshinskii-Moriya interaction through magnetostriction effects. The phase diagram shows the expansion of the cycloid phase with increasing field before transitioning to a polarized paramagnetic state at 5 T.
PHYSICAL REVIEW RESEARCH
(2023)
Article
Physics, Multidisciplinary
A. -M. Visuri, T. Giamarchi, C. Kollath
Summary: This paper investigates particle transport, particle loss, and nonequilibrium steady states in a dissipative one-dimensional lattice connected to reservoirs at both ends. By applying local particle loss to the center site, particle transport is generated between free-fermion reservoirs with different chemical potentials. The conserved current and loss current as functions of voltage in the nonlinear regime are computed using a Keldysh description. The behaviors of the currents are affected differently by the local loss, resulting in either smoothed, nearly unaffected, or even enhanced steps depending on the spatial symmetry of the single-particle eigenstate.
PHYSICAL REVIEW RESEARCH
(2023)
Article
Physics, Multidisciplinary
Tony Jin, Joao Ferreira, Michel Bauer, Michele Filippone, Thierry Giamarchi
Summary: We have developed a semiclassical model to study the transport properties of low-dimensional fermionic lattices under the influence of external quantum stochastic noise. These systems exhibit behavior similar to quantum stochastic resistors, where bulk particle transport is diffusive and follows Ohm's/Fick's law. By extending previous studies beyond one-dimensional systems to ladder geometries, we have explored different dephasing mechanisms relevant to various physical systems. Our results show that the semiclassical description provides a useful and simpler interpretation of the conductance dependence on chemical potential, which agrees well with exact numerical solutions. Additionally, we have found that the coherence of the dephasing process in the transverse direction does not affect the conductance of quantum ladders, despite different stationary states being reached.
PHYSICAL REVIEW RESEARCH
(2023)
Article
Physics, Multidisciplinary
Catalin-Mihai Halati, Thierry Giamarchi
Summary: We investigate the properties of interacting bosonic particles on a two-leg triangular ladder with an artificial gauge field. By using numerical simulations and analytical bosonization calculations, we explore the complex phase diagram of this system. The interplay between the frustration from the triangular lattice geometry and the interactions leads to the emergence of multiple chiral quantum phases. Phase transitions from superfluid to Mott-insulating states occur, exhibiting Meissner or vortex characteristics. Moreover, we discover a biased chiral superfluid state that breaks the symmetry between the two legs of the ladder, particularly for flux values close to pi. In the regime of hard-core bosons, we demonstrate the extension of the bond order insulator, beyond the fully frustrated ladder case, with Meissner-type chiral currents. We discuss the implications of our findings for experimental studies in cold atomic systems.
PHYSICAL REVIEW RESEARCH
(2023)
