2 | Wei Li's Group

Spin Seebeck Effect of Triangular Lattice Spin Supersolid

Fri, 05 Dec 2025 00:00:00 +0000

Quantum supercritical regime with universal magnetocaloric scaling in Ising magnets

Thu, 27 Nov 2025 00:00:00 +0000

Phase Diagram, d-Wave Superconductivity, and Pseudogap of the t-t'-J Model at Finite Temperature

Thu, 19 Dec 2024 00:00:00 +0000

Magnetocaloric effect of topological excitations in Kitaev magnets

Thu, 15 Aug 2024 00:00:00 +0000

Orbital-selective superconductivity in the pressurized bilayer nickelate La3Ni2O7: An infinite projected entangled-pair state study

Mon, 08 Jul 2024 00:00:00 +0000

Bilayer t-J-J⊥ Model and Magnetically Mediated Pairing in the Pressurized Nickelate La3Ni2O7

Fri, 19 Jan 2024 00:00:00 +0000

Giant magnetocaloric effect in spin supersolid candidate Na$_2$BaCo(PO$_4$)$_2$

Wed, 10 Jan 2024 00:00:00 +0000

A one-third magnetization plateau phase as evidence for the Kitaev interaction in a honeycomb-lattice antiferromagnet

Mon, 25 Sep 2023 00:00:00 +0000

Plaquette Singlet Transition, Magnetic Barocaloric Effect, and Spin Supersolidity in the Shastry-Sutherland Model

Thu, 14 Sep 2023 00:00:00 +0000

Possible intermediate quantum spin liquid phase in α-RuCl$_3$ under high magnetic fields up to 100 T

Tue, 12 Sep 2023 00:00:00 +0000

Tangent Space Approach for Thermal Tensor Network Simulations of the 2D Hubbard Model

Thu, 01 Jun 2023 00:00:00 +0000

High-field quantum spin liquid transitions and angle-field phase diagram of the Kitaev magnet α−RuCl3

Fri, 10 Mar 2023 00:00:00 +0000

Spin-triplet pairing induced by near-neighbor attraction in the extended Hubbard model for cuprate chain

Fri, 21 Oct 2022 00:00:00 +0000

Quantum spin liquid candidate as superior refrigerant in cascade demagnetization cooling

Wed, 21 Sep 2022 00:00:00 +0000

Quantum spin liquid with emergent chiral order in the triangular-lattice Hubbard model

Fri, 16 Sep 2022 00:00:00 +0000

Spin supersolidity in nearly ideal easy-axis triangular quantum antiferromagnet Na2BaCo(PO4)2

Sat, 10 Sep 2022 00:00:00 +0000

Exciton Proliferation and Fate of the Topological Mott Insulator in a Twisted Bilayer Graphene Lattice Model

Tue, 12 Apr 2022 00:00:00 +0000

Detecting confined and deconfined spinons in dynamical quantum simulations

Fri, 11 Mar 2022 00:00:00 +0000

Realization of topological Mott insulator in a twisted bilayer graphene lattice model

Thu, 16 Sep 2021 00:00:00 +0000

Learning the Effective Spin Hamiltonian of a Quantum Magnet

Fri, 27 Aug 2021 00:00:00 +0000

Significant inverse magnetocaloric effect induced by quantum criticality

Tue, 27 Jul 2021 00:00:00 +0000

Kondo Holes in the Two-Dimensional Itinerant Ising Ferromagnet Fe3GeTe2

Mon, 19 Jul 2021 00:00:00 +0000

Identification of magnetic interactions and high-field quantum spin liquid in α-RuCl3

Tue, 29 Jun 2021 00:00:00 +0000

Symmetry-Protected Topological Edge Modes and Emergent Partial Time-Reversal Symmetry Breaking in Open Quantum Many-Body Systems

Wed, 09 Jun 2021 00:00:00 +0000

Spin dynamics and Griffiths singularity in the random quantum Ising magnet PrTiNbO6

Wed, 31 Mar 2021 00:00:00 +0000

Phase diagram of the quantum Ising model on a triangular lattice under external field

Thu, 11 Mar 2021 00:00:00 +0000

Quantum Many-Body Simulations of the Two-Dimensional Fermi-Hubbard Model in Ultracold Optical Lattices

Fri, 01 Jan 2021 00:00:00 +0000

Evidence of the Berezinskii-Kosterlitz-Thouless phase in a frustrated magnet

Sun, 01 Nov 2020 00:00:00 +0000

Universal thermodynamics in the Kitaev fractional liquid

Thu, 01 Oct 2020 00:00:00 +0000

Automatic Differentiation for Second Renormalization of Tensor Networks

Mon, 01 Jun 2020 00:00:00 +0000

Noise-Driven Universal Dynamics towards an Infinite Temperature State

Tue, 31 Mar 2020 00:00:00 +0000

Kosterlitz-Thouless melting of magnetic order in the triangular quantum Ising material TmMgGaO$_4$

Fri, 28 Feb 2020 00:00:00 +0000

TmMgGaO₄ is one of a number of recently-synthesized quantum magnets that are proposed to realize important theoretical models. Here the authors demonstrate the agreement between detailed experimental measurements and state-of-the-art predictions based on the 2D transverse field triangular lattice Ising model.

Thermal Tensor Network Simulations of the Heisenberg Model on the Bethe Lattice

Sun, 01 Sep 2019 00:00:00 +0000

Giant Magnetic Quantum Oscillations in the Thermal Conductivity of TaAs: Indications of Chiral Zero Sound

Wed, 28 Aug 2019 00:00:00 +0000

Thermal Tensor Renormalization Group Simulations of Square-Lattice Quantum Spin Models

Tue, 09 Jul 2019 00:00:00 +0000

Two-Temperature Scales in the Triangular-Lattice Heisenberg Antiferromagnet

Mon, 01 Apr 2019 00:00:00 +0000

The anomalous thermodynamic properties of the paradigmatic frustrated spin-1/2 triangular-lattice Heisenberg antiferromagnet (TLH) has remained an open topic of research over decades, both experimentally and theoretically. Here, we further the theoretical understanding based on the recently developed, powerful exponential tensor renormalization group method on cylinders and stripes in a quasi-one-dimensional (1D) setup, as well as a tensor product operator approach directly in 2D. The observed thermal properties of the TLH are in excellent agreement with two recent experimental measurements on the virtually ideal TLH material Ba8CoNb6O24. Remarkably, our numerical simulations reveal two crossover temperature scales, at Tl/J$∼$0.20 and Th/J$∼$0.55, with J the Heisenberg exchange coupling, which are also confirmed by a more careful inspection of the experimental data. We propose that in the intermediate regime between the low-temperature scale Tl and the higher one Th, the ``rotonlike'' excitations are activated with a strong chiral component and a large contribution to thermal entropies. Bearing remarkable resemblance to the renowned roton thermodynamics in liquid helium, these gapped excitations suppress the incipient 120$∘$ order that emerges for temperatures below Tl.

Nontopological Majorana Zero Modes in Inhomogeneous Spin Ladders

Tue, 01 Jan 2019 00:00:00 +0000

Exponential Thermal Tensor Network Approach for Quantum Lattice Models

Sat, 01 Sep 2018 00:00:00 +0000

We speed up thermal simulations of quantum many-body systems in both one- (1D) and two-dimensional (2D) models in an exponential way by iteratively projecting the thermal density matrix $\rho=e^{-\beta H}$ onto itself. We refer to this scheme of doubling $\beta$ in each step of the imaginary time evolution as the exponential tensor renormalization group (XTRG). This approach is in stark contrast to conventional Trotter-Suzuki-type methods which evolve $\rho$ on a linear quasicontinuous grid in inverse temperature $\beta\equiv1/T$. As an aside, the large steps in XTRG allow one to swiftly jump across finite-temperature phase transitions, i.e., without the need to resolve each singularly expensive phase-transition point right away, e.g., when interested in low-energy behavior. A fine temperature resolution can be obtained, nevertheless, by using interleaved temperature grids. In general, XTRG can reach low temperatures exponentially fast and, thus, not only saves computational time but also merits better accuracy due to significantly fewer truncation steps. For similar reasons, we also find that the series expansion thermal tensor network approach benefits in both efficiency and precision, from the logarithmic temperature scale setup. We work in an (effective) 1D setting exploiting matrix product operators (MPOs), which allows us to fully and uniquely implement non-Abelian and Abelian symmetries to greatly enhance numerical performance. We use our XTRG machinery to explore the thermal properties of Heisenberg models on 1D chains and 2D square and triangular lattices down to low temperatures approaching ground-state properties. The entanglement properties, as well as the renormalization-group flow of entanglement spectra in MPOs, are discussed, where logarithmic entropies (approximately $\ln{\beta}$) are shown in both spin chains and square-lattice models with gapless towers of states. We also reveal that XTRG can be employed to accurately simulate the Heisenberg XXZ model on the square lattice which undergoes a thermal phase transition. We determine its critical temperature based on thermal physical observables, as well as entanglement measures. Overall, we demonstrate that XTRG provides an elegant, versatile, and highly competitive approach to explore thermal properties, including finite-temperature thermal phase transitions as well as the different ordering tendencies at various temperature scales for frustrated systems.

Topological and Geometric Universal Thermodynamics in Conformal Field Theory

Fri, 01 Jun 2018 00:00:00 +0000

Emergent spin-1 trimerized valence bond crystal in the spin-1/2 Heisenberg model on the star lattice

Mon, 26 Feb 2018 00:00:00 +0000

Anisotropic thermal and electrical transport of Weyl semimetal TaAs

Wed, 06 Dec 2017 00:00:00 +0000

Conformal Thermal Tensor Network and Universal Entropy on Topological Manifolds

Wed, 01 Nov 2017 00:00:00 +0000

Universal Boundary Entropies in Conformal Field Theory: A Quantum Monte Carlo Study

Fri, 01 Sep 2017 00:00:00 +0000

Criticality in two-dimensional quantum systems: Tensor network approach

Mon, 10 Apr 2017 00:00:00 +0000

Bilayer Linearized Tensor Renormalization Group Approach for Thermal Tensor Networks

Sat, 01 Apr 2017 00:00:00 +0000

Series-Expansion Thermal Tensor Network Approach for Quantum Lattice Models

Sat, 01 Apr 2017 00:00:00 +0000

Criticality-Enhanced Magnetocaloric Effect in Quantum Spin Chain Material Copper Nitrate

Wed, 01 Mar 2017 00:00:00 +0000

Spin-ordered ground state and thermodynamic behaviors of the spin-3/2 kagome Heisenberg antiferromagnet

Tue, 13 Sep 2016 00:00:00 +0000

Quantum phase transition, universality, and scaling behaviors in the spin-1/2 Heisenberg model with ferromagnetic and antiferromagnetic competing interactions on a honeycomb lattice

Mon, 06 Jun 2016 00:00:00 +0000

Self-Consistent Spin-Wave Analysis of the 1/3 Magnetization Plateau in the Kagome Antiferromagnet

Sun, 15 May 2016 00:00:00 +0000

Hexagon-Singlet Solid Ansatz for the Spin-1 Kagome Antiferromagnet

Mon, 01 Jun 2015 00:00:00 +0000

Topology-Driven Phase Transitions in the Classical Monomer-Dimer-Loop Model

Mon, 01 Jun 2015 00:00:00 +0000

Criticality in Translation-Invariant Parafermion Chains

Sun, 01 Mar 2015 00:00:00 +0000

Simplex Valence-Bond Crystal in the Spin-1 Kagome Heisenberg Antiferromagnet

Sun, 01 Feb 2015 00:00:00 +0000

Kosterlitz-Thouless Transitions and Phase Diagrams of the Interacting Monomer-Dimer Model on a Checkerboard Lattice

Sat, 01 Nov 2014 00:00:00 +0000

Topology and Criticality in the Resonating Affleck-Kennedy-Lieb-Tasaki Loop Spin Liquid States

Thu, 01 May 2014 00:00:00 +0000

Identifying Symmetry-Protected Topological Order by Entanglement Entropy

Sun, 01 Dec 2013 00:00:00 +0000

Efficient Simulation of Infinite Tree Tensor Network States on the Bethe Lattice

Thu, 01 Nov 2012 00:00:00 +0000

Matrix Product State and Quantum Phase Transitions in the One-Dimensional Extended Quantum Compass Model

Tue, 01 May 2012 00:00:00 +0000

Linearized Tensor Renormalization Group Algorithm for the Calculation of Thermodynamic Properties of Quantum Lattice Models

Tue, 01 Mar 2011 00:00:00 +0000

Phase Transitions and Thermodynamics of the Two-Dimensional Ising Model on a Distorted Kagome Lattice

Fri, 01 Oct 2010 00:00:00 +0000

Quantum Phase Transition, $O(3)$ Universality Class, and Phase Diagram of the Spin-$frac12$ Heisenberg Antiferromagnet on a Distorted Honeycomb Lattice: A Tensor Renormalization-Group Study

Sat, 01 May 2010 00:00:00 +0000