Promoting and imaging intervalley coherent order in rhombohedral tetralayer graphene on MoS2
arXiv:2411.14113 · doi:10.1103/s27c-kmfs
Abstract
Multilayer rhombohedral graphene (RG) has recently emerged as a new, structurally simple flat-band system, which facilitates the exploration of interaction-driven correlation states with highly ordered electron arrangements. Despite a variety of many-body order behaviors observed in RG by transport measurements, the direct microscopic visualization of such correlated phases in real space is still lacking. Here, we show the discovery of a robust intervalley coherent order, a long-predicted ground state in RG, at 77 K in tetralayer RG placed on MoS2 via imaging atomic-scale spatial reconstruction of wave functions for correlated states. By using scanning tunnelling microscopy, we observe spectroscopic signatures of electronic correlations at partially filled flat bands, where distinct splitting appears. At ~60% and ~70% fillings of the flat bands, we visualize atomic-scale reconstruction patterns with a <sqrt>3 x <sqrt>3 supercell on graphene lattice at liquid nitrogen temperature, which indicates a robust intervalley coherent phase of the interacting electrons. The <sqrt>3 x <sqrt>3 pattern is observed in MoS2-supported RG, while it is absent in hBN-based ones under the same experimental conditions, suggesting the significant influence of spin-orbit proximity effect. Our results provide microscopic insights into the correlated phases in tetralayer RG and highlight the significant potential for realizing highly accessible collective phenomena through Van der Waals proximity.
21 pages, 5 figures
References in corpus (25)
- The electronic properties of bilayer graphene
- Superconductivity in rhombohedral trilayer graphene
- Bandgap and doping effects in MoS2 measured by Scanning Tunneling Microscopy and Spectroscopy
- Correlated Insulator and Chern Insulators in Pentalayer Rhombohedral Stacked Graphene
- Visualizing Broken Symmetry and Topological Defects in a Quantum Hall Ferromagnet
- Quantum textures of the many-body wavefunctions in magic-angle graphene
- Orbital Multiferroicity in Pentalayer Rhombohedral Graphene
- Large Quantum Anomalous Hall Effect in Spin-Orbit Proximitized Rhombohedral Graphene
- Inter-valley coherent order and isospin fluctuation mediated superconductivity in rhombohedral trilayer graphene
- Imaging tunable quantum Hall broken-symmetry orders in graphene
- Imaging inter-valley coherent order in magic-angle twisted trilayer graphene
- MoS2: a Choice Substrate for Accessing and Tuning the Electronic Properties of Graphene
- Intervalley coherence and intrinsic spin-orbit coupling in rhombohedral trilayer graphene
- Flavor symmetry breaking in spin-orbit coupled bilayer graphene
- Detecting symmetry breaking in magic angle graphene using scanning tunneling microscopy
- Electrical control of spin and valley in spin-orbit coupled graphene multilayers
- Correlated Phases in Spin-Orbit-Coupled Rhombohedral Trilayer Graphene
- Topological flat bands in rhombohedral tetralayer and multilayer graphene on hexagonal boron nitride moire superlattices
- Direct Probing Stacking Order and Electronic Spectrum of Rhombohedral Trilayer Graphene with Scanning Tunneling Microscopy
- Observation of competing, correlated ground states in the flat band of rhombohedral graphite
- Surface ferromagnetism in rhombohedral heptalayer graphene moire superlattice
- Superconductivity and spin canting in spin-orbit proximitized rhombohedral trilayer graphene
- Layer-dependent evolution of electronic structures and correlations in rhombohedral multilayer graphene
- Emergent correlated phases in rhombohedral trilayer graphene induced by proximity spin-orbit and exchange coupling
- Observation of Kekulé vortices induced in graphene by hydrogen adatoms