Tunable exciton valley-pseudospin orders in moiré Bose-Hubbard model

• URL: http://arxiv.org/abs/2404.18931v2
• Date: Fri, 3 May 2024 07:49:55 GMT
• Title: Tunable exciton valley-pseudospin orders in moiré Bose-Hubbard model
• Authors: Richen Xiong, Samuel L. Brantly, Kaixiang Su, Jacob H. Nie, Zihan Zhang, Rounak Banerjee, Hayley Ruddick, Kenji Watanabe, Takashi Taniguchi, Sefaattin Tongay, Cenke Xu, Chenhao Jin,
• Abstract summary: We demonstrate a unique realization of the spin-1/2 Bose-Hubbard model through excitons in a semiconducting moir'e superlattice. Our study paves the way for engineering exotic phases of matter from spinor bosons, as well as for unconventional devices in optics and quantum information science.
• Score: 11.10551054215743
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Spin and charge are the two most important degrees of freedom of electrons. Their interplay lies at the heart of numerous strongly correlated phenomena including Hubbard model physics and high temperature superconductivity. Such interplay for bosons, on the other hand, is largely unexplored in condensed matter systems. Here we demonstrate a unique realization of the spin-1/2 Bose-Hubbard model through excitons in a semiconducting moir\'e superlattice. We find evidence of a transient in-plane ferromagnetic (FM-$xy$) order of exciton spin - here valley pseudospin - around exciton filling $\nu_{ex}$ = 1, which transitions into a FM-$z$ order both with increasing exciton filling and a small magnetic field of 10 mT. The phase diagram is different from the fermion case and is qualitatively captured by a simple phenomenological model, highlighting the unique consequence of Bose-Einstein statistics. Our study paves the way for engineering exotic phases of matter from spinor bosons, as well as for unconventional devices in optics and quantum information science.

Related papers

• Kinetic magnetism and stripe order in the doped AFM bosonic ${t-J}$ model [0.0]
  We explore the strong coupling limit of doped bosonic quantum magnets, specifically the antiferromagnetic (AFM) bosonic $t-J$ model. We find that in the low doping regime, bosonic holes tend to form partially-filled stripes, akin to those observed in high-$T_c$ cuprates. Our findings shed light on the role of particle statistics in strongly correlated quantum matter and connect to phases in the 2D Fermi-Hubbard and $t-J$ models.
  arXiv  Detail & Related papers  (2024-10-01T17:50:10Z)
• Quantum-interference-induced pairing in antiferromagnetic bosonic $t$-$J$ model [1.5064460450689483]
  An antiferromagnetic bosonic $t$-$J$ model is investigated via large-scale density matrix renormalization group calculations. We find that a pair density wave (PDW) of tightly bound hole pairs coexists with the AFM order forming a supersolid'' at small doping. The pairing order collapses at larger doping to a superfluid of single-boson condensation with the spin background to a ferromagnetic (FM) order simultaneously.
  arXiv  Detail & Related papers  (2024-09-23T18:00:04Z)
• Fragmented superconductivity in the Hubbard model as solitons in Ginzburg-Landau theory [39.58317527488534]
  Superconductivity and charge density waves are observed in close vicinity in strongly correlated materials. We investigate the nature of such an intertwined state of matter stabilized in the phase diagram of the elementary $t$-$tprime$-$U$ Hubbard model. We provide conclusive evidence that the macroscopic wave functions of the superconducting fragments are well-described by soliton solutions of a Ginzburg-Landau equation.
  arXiv  Detail & Related papers  (2023-07-21T18:00:07Z)
• Thermal masses and trapped-ion quantum spin models: a self-consistent approach to Yukawa-type interactions in the $λ\!φ^4$ model [44.99833362998488]
  A quantum simulation of magnetism in trapped-ion systems makes use of the crystal vibrations to mediate pairwise interactions between spins. These interactions can be accounted for by a long-wavelength relativistic theory, where the phonons are described by a coarse-grained Klein-Gordon field. We show that thermal effects, which can be controlled by laser cooling, can unveil this flow through the appearance of thermal masses in interacting QFTs.
  arXiv  Detail & Related papers  (2023-05-10T12:59:07Z)
• Excitonic Mott insulator in a Bose-Fermi-Hubbard system of moiré $\rm{WS}_2$/$\rm{WSe}_2$ heterobilayer [1.5312601525030873]
  We study the interplay between fermionic and bosonic populations using a transition metal dichalcogenides heterobilayer device. We measure exciton diffusion, which remains constant upon increasing pumping intensity, as opposed to the expected behavior of a weakly interacting gas of bosons. Our system provides a controllable approach to the exploration of quantum many-body model.
  arXiv  Detail & Related papers  (2023-04-19T15:18:18Z)
• Halide perovskite artificial solids as a new platform to simulate collective phenomena in doped Mott insulators [43.55994393060723]
  We introduce artificial lattices made of lead halide perovskite nanocubes as a new platform to simulate and investigate the physics of correlated quantum materials. We show that, at large photo-doping, the exciton gas undergoes an excitonic Mott transition, which fully realizes the magnetic-field-driven insulator-to-metal transition described by the Hubbard model. Our results demonstrate that time-resolved experiments span a parameter region of the Hubbard model in which long-range and phase-coherent orders emerge out of a doped Mott insulating phase.
  arXiv  Detail & Related papers  (2023-03-15T17:38:51Z)
• Formation of robust bound states of interacting microwave photons [148.37607455646454]
  One of the hallmarks of interacting systems is the formation of multi-particle bound states. We develop a high fidelity parameterizable fSim gate that implements the periodic quantum circuit of the spin-1/2 XXZ model. By placing microwave photons in adjacent qubit sites, we study the propagation of these excitations and observe their bound nature for up to 5 photons.
  arXiv  Detail & Related papers  (2022-06-10T17:52:29Z)
• Spin many-body phases in standard and topological waveguide QED simulators [68.8204255655161]
  We study the many-body behaviour of quantum spin models using waveguide QED setups. We find novel many-body phases different from the ones obtained in other platforms.
  arXiv  Detail & Related papers  (2021-06-22T09:44:20Z)
• Cold atoms meet lattice gauge theory [72.24363031615489]
  We will consider quantum field theory models relevant for particle physics and replace the fermionic matter in these models by a bosonic one. This is motivated by the fact that bosons are more accessible'' and easier to manipulate for experimentalists, but this substitution'' also leads to new physics and novel phenomena.
  arXiv  Detail & Related papers  (2021-06-06T08:53:47Z)
• Realization of a Bosonic Antiferromagnet [6.2669932229958345]
  We create a one-dimensional Heisenberg antiferromagnet with ultracold bosons. Compared with condensed matter systems, ultracold gases in optical lattices can be microscopically engineered and measured.
  arXiv  Detail & Related papers  (2020-09-03T03:08:04Z)
• Spin transport in a tunable Heisenberg model realized with ultracold atoms [0.0]
  We implement the Heisenberg XXZ model with adjustable anisotropy and study spin transport far from equilibrium. For positive anisotropies, the dynamics ranges from anomalous super-diffusion to sub-diffusion depending on anisotropy. For negative anisotropies, we observe a crossover in the time domain from ballistic to diffusive transport.
  arXiv  Detail & Related papers  (2020-05-19T16:08:31Z)

This list is automatically generated from the titles and abstracts of the papers in this site.

This site does not guarantee the quality of this site (including all information) and is not responsible for any consequences.