Chern junctions in Moiré-Patterned Graphene/PbI2

• URL: http://arxiv.org/abs/2508.04935v1
• Date: Wed, 06 Aug 2025 23:37:06 GMT
• Title: Chern junctions in Moiré-Patterned Graphene/PbI2
• Authors: Sun Yan, M. Monteverde, V. Derkach, K. Watanabe, T. Taniguchi, F. Chiodi, H. Bouchiat, A. D. Chepelianskii,
• Abstract summary: We introduce PbI2 into the moir'e family and investigate the magnetotransport properties of moir'e superlattices.<n>In high-field quantum Hall regime, we observe a robust dissipationless transport at charge neutrality point.<n>We also see coherent electronic interference along lines with Chern number vm = -2.
• Score: 0.0
• License: http://creativecommons.org/licenses/by-nc-nd/4.0/
• Abstract: Expanding the moir\'e material library continues to unlock novel quantum phases and emergent electronic behaviors. In this work, we introduce PbI2 into the moir\'e family and investigate the magnetotransport properties of moir\'e superlattice in a hexagonal boron nitride/graphene/PbI2 heterostructures. In high-field quantum Hall regime, we observe a robust dissipationless transport at charge neutrality point, indicative of incompressible states stabilized at the filling factor vh = 0. Additionally, a fractional conductance plateau at 2/3 e2/h emerges, which we attribute to a Chern junction between domains with distinct Chern numbers originating from moir\'e-modulated and conventional integer quantum Hall states. The moir\'e Hofstadter spectrum displays an unconventional flavor sequence, likely influenced by proximity-induced spin-orbit coupling from the PbI2 layer. We also see coherent electronic interference along lines with Chern number vm = -2. These findings position PbI2-based heterostructures as a versatile platform for realizing spin-orbit-enhanced moir\'e phenomena and engineering coherent edge transport in two-dimensional quantum materials.

Related papers

• Topological Signatures of Magnetic Phase Transitions with Majorana Fermions through Local Observables and Quantum Information [2.7204116565403744]
  The one-dimensional (1D) $J_1-J$ quantum spin model can be viewed as a strong-coupling analogue of the Schrieffer-Su-Heeger model.<n>This model also maps onto a p-wave superconducting wire which shows a topological phase transition with the emergence of low-energy Majorana fermions.<n>This system may be realized in materials and engineered in quantum circuits, optical lattices.
  arXiv  Detail & Related papers  (2025-06-13T12:43:34Z)
• Quasi-$Φ_0$-periodic supercurrent at quantum Hall transitions [31.269816893043046]
  Recent quantum interference studies suggest that QH edge states can effectively mediate a supercurrent across high-quality graphene weak links.<n>We employ a back-gated graphene Josephson junction, comprising high-mobility CVD-grown graphene encapsulated in hexagonal Boron Nitride (hBN) and contacted by Nb leads.<n>Superconducting pockets are detected persisting beyond the QH onset, up to 2.4 T, hence approaching the upper critical field of the Nb contacts.
  arXiv  Detail & Related papers  (2025-03-19T16:22:56Z)
• Harnessing Chiral Spin States in Molecular Nanomagnets for Quantum Technologies [44.1973928137492]
  We show that chiral qubits naturally suppress always-on interactions that can not be switched off in weakly coupled qubits.<n>Our findings establish spin chirality engineering as a promising strategy for mitigating always-on interaction in entangling two chiral qubits in molecular quantum technologies.
  arXiv  Detail & Related papers  (2025-01-21T08:23:12Z)
• Transport properties and quantum phase transitions in one-dimensional superconductor-ferromagnetic insulator heterostructures [44.99833362998488]
  We propose a one-dimensional electronic nanodevice inspired in recently fabricated semiconductor-superconductor-ferromagnetic insulator hybrids. We show that the device can be tuned across spin- and fermion parity-changing QPTs by adjusting the FMI layer length orange and/or by applying a global backgate voltage. Our findings suggest that these effects are experimentally accessible and offer a robust platform for studying quantum phase transitions in hybrid nanowires.
  arXiv  Detail & Related papers  (2024-10-18T22:25:50Z)
• Quantum phase transitions and cat states in cavity-coupled quantum dots [0.0]
  We study double quantum dots coupled to a quasistatic cavity mode with high mode-volume compression. electrons in different double quantum dots interact with each other via dipole-dipole (Coulomb) interaction. We show that, in the strong coupling regime, both the ground and the first excited states of an array of double quantum dots are squeezed Schr"odinger cat states.
  arXiv  Detail & Related papers  (2023-10-23T17:59:41Z)
• Unconditional Wigner-negative mechanical entanglement with linear-and-quadratic optomechanical interactions [62.997667081978825]
  We propose two schemes for generating Wigner-negative entangled states unconditionally in mechanical resonators. We show analytically that both schemes stabilize a Wigner-negative entangled state that combines the entanglement of a two-mode squeezed vacuum with a cubic nonlinearity. We then perform extensive numerical simulations to test the robustness of Wigner-negative entanglement attained by approximate CPE states stabilized in the presence of thermal decoherence.
  arXiv  Detail & Related papers  (2023-02-07T19:00:08Z)
• A first-principles calculation of electron-phonon interactions for the $\ ext{C}_2\ ext{C}_\ ext{N}$ and $\ ext{V}_\ ext{N}\ ext{N}_\ ext{B}$ defects in hexagonal boron nitride [52.77024349608834]
  Quantum emitters in two-dimensional hexagonal boron nitride (h-BN) have generated significant interest. Recent observations of Fourier transform (FT) limited photons emitted from h-BN flakes at room temperature.
  arXiv  Detail & Related papers  (2022-07-28T23:31:38Z)
• Manipulating Generalized Dirac Cones In Quantum Metasurfaces [68.8204255655161]
  We consider a collection of single quantum emitters arranged in a honeycomb lattice with subwavelength periodicity. We show that introducing uniaxial anisotropy in the lattice results in modified dispersion relations.
  arXiv  Detail & Related papers  (2022-03-21T17:59:58Z)
• Quantum spin liquids of Rydberg excitations in a honeycomb lattice induced by density-dependent Peierls phases [0.0]
  We show that the nonlinear transport of bosonic excitations in a two-dimensional honeycomb lattice of spin-orbit coupled Rydberg atoms gives rise to disordered quantum phases. We show that this phase is a genuine disordered one, has a non-vanishing spin chirality and is characterized by a non-trivial many-body Chern number.
  arXiv  Detail & Related papers  (2022-02-07T15:17:42Z)
• Variational Quantum Simulation of Valence-Bond Solids [0.0]
  We introduce a hybrid quantum-classical variational algorithm to simulate ground-state phase diagrams of frustrated quantum spin models. We benchmark the method against the J1-J2 Heisenberg model on the square lattice and uncover its phase diagram. Our results show that the convergence of the algorithm is guided by the onset of long-range order, opening a promising route to synthetically realize frustrated quantum magnets.
  arXiv  Detail & Related papers  (2022-01-07T17:05:14Z)
• Phase diagram of Rydberg-dressed atoms on two-leg square ladders: Coupling supersymmetric conformal field theories on the lattice [52.77024349608834]
  We investigate the phase diagram of hard-core bosons in two-leg ladders in the presence of soft-shoulder potentials. We show how the competition between local and non-local terms gives rise to a phase diagram with liquid phases with dominant cluster, spin, and density-wave quasi-long-range ordering.
  arXiv  Detail & Related papers  (2021-12-20T09:46:08Z)
• Effect of Emitters on Quantum State Transfer in Coupled Cavity Arrays [48.06402199083057]
  We study the effects of atoms in cavities which can absorb and emit photons as they propagate down the array. Our model is equivalent to previously examined spin chains in the one-excitation sector and in the absence of emitters.
  arXiv  Detail & Related papers  (2021-12-10T18:52:07Z)
• Chemical tuning of spin clock transitions in molecular monomers based on nuclear spin-free Ni(II) [52.259804540075514]
  We report the existence of a sizeable quantum tunnelling splitting between the two lowest electronic spin levels of mononuclear Ni complexes. The level anti-crossing, or magnetic clock transition, associated with this gap has been directly monitored by heat capacity experiments. The comparison of these results with those obtained for a Co derivative, for which tunnelling is forbidden by symmetry, shows that the clock transition leads to an effective suppression of intermolecular spin-spin interactions.
  arXiv  Detail & Related papers  (2021-03-04T13:31:40Z)
• Exploring 2D synthetic quantum Hall physics with a quasi-periodically driven qubit [58.720142291102135]
  Quasi-periodically driven quantum systems are predicted to exhibit quantized topological properties. We experimentally study a synthetic quantum Hall effect with a two-tone drive.
  arXiv  Detail & Related papers  (2020-04-07T15:00:41Z)

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.