![]() Liquid-solid transition and the fractional quantum-Hall effect. Collective aspects of charged-particle systems at helium interfaces. Evidence for a liquid-to-crystal phase transition in a classical, two-dimensional sheet of electrons. Surface states of electrons on liquid helium. Crystallization of electrons on the surface of liquid helium. The one-dimensional Wigner crystal in carbon nanotubes. Correlated insulating states at fractional fillings of the WS 2/WSe 2 moiré lattice. Correlated insulating states at fractional fillings of moiré superlattices. Stripe phases in WSe 2/WS 2 moiré superlattices. Mott and generalized Wigner crystal states in WSe 2/WS 2 moiré superlattices. Imaging the electronic Wigner crystal in one dimension. Solids of quantum Hall skyrmions in graphene. Zhou, H., Polshyn, H., Taniguchi, T., Watanabe, K. Sharp tunnelling resonance from the vibrations of an electronic Wigner crystal. Evidence for two-dimentional quantum Wigner crystal. On the interaction of electrons in metals. Our study lays a solid foundation for understanding Wigner crystal states in WSe 2/WS 2 moiré heterostructures and provides an approach that is generally applicable for imaging novel correlated electron lattices in other systems. The n = 1/2 state spontaneously breaks the original C3 symmetry and forms a stripe phase. The n = 1/3 and n = 2/3 Wigner crystals exhibit triangular and honeycomb lattices, respectively, to minimize nearest-neighbour occupations. Different Wigner crystal lattice configurations at fractional electron fillings of n = 1/3, 1/2 and 2/3, where n is the electron number per site, are directly visualized. Local STM tunnel current into the graphene layer is modulated by the underlying Wigner crystal electron lattice in the WSe 2/WS 2 heterostructure. This employs a graphene sensing layer held close to the WSe 2/WS 2 moiré superlattice. Here we demonstrate real-space imaging of 2D Wigner crystals in WSe 2/WS 2 moiré heterostructures using a specially designed non-invasive STM spectroscopy technique. Conventional scanning tunnelling microscopy (STM) has sufficient spatial resolution but induces perturbations that can potentially alter this fragile state. Direct observation of the 2D Wigner crystal lattice in real space, however, has remained an outstanding challenge. Signatures of two-dimensional (2D) Wigner crystals were first observed in 2D electron gases under high magnetic field 2, 3, 4, and recently reported in transition metal dichalcogenide moiré superlattices 6, 7, 8, 9. The Wigner crystal 1 has fascinated condensed matter physicists for nearly 90 years 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |