English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Tools annual

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Presents the access of premium content as premium feature

Premium Content

Global: Zendy Plus annual

Global: Zendy Free Plan

We present a restricted solid on solid hamiltonian for fcc (110) surfaces. Itis the simplest generalization of the exactly solvable BCSOS model which isable to describe a $(2\times 1)$ missing-row reconstructed surface. We studythis model by mapping it onto a quantum spin-1/2 chain of the Heisenberg type,with second and third neighbor $S^z_iS^z_j$ couplings. The ground state phasediagram of the spin-chain model is studied by exact diagonalization of finitechains up to $N=28$ sites, as well as through analytical techniques. We findfour phases in the phase diagram: two ordered phases in which the spins have aN\'eel-type of long range order (an unreconstructed and a missing-rowreconstructed phase, in the surface language), a spin liquid phase(representing a rough surface), and an intermediate dimer phase which breakstranslational invariance and has a doubly degenerate ground state,corresponding to a disordered flat surface. The transition from the $(2\times1)$ reconstructed phase to the disordered flat phase belongs to the $2D$ Isinguniversality class. A critical (preroughening) line with varying exponentsseparates the unreconstructed phase from the disordered flat phase. Thepossible experimental signatures of the disordered flat phase are discussed.Comment: 20 pages (10 Figures available upon request), REVTEX, SISSA PREPRINT  1/94/CM/S

Disordered flat phase in a solid-on-solid model of fcc(110) surfaces and dimer states in quantum spin-1/2 chains