Surface state bi-polarons formation on a triangular lattice in the sp-type alkali/Si(111) Mott insulator

Details Surface state bi-polarons formation on a triangular lattice in the sp-type alkali/Si(111) Mott insulator Surface state bi-polarons formation on a triangular lattice in the sp-type alkali/Si(111) Mott insulator

2009-07-09

arxiv.org/abs/0907.1573v1

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 3 figures. accepted in Physical Review Letters (2009)

Scientific paper

We report on new LEED, STM and ARPES studies of alkali/Si(111) previously established as having a Mott insulating ground state at surface. The observation of a strong temperature dependent Franck-Condon broadening of the surface band together with the novel $\sqrt{3}\times\sqrt{3}\to2(\sqrt{3}\times\sqrt{3})$ charge and lattice ordering below 270 K evidence a surface charge density wave (SCDW) in the strong e-ph coupling limit ($g\approx8$). Both the adiabatic ratio $\hbar\omega_0/t\approx0.8$ and the effective pairing energy $V_{eff}=U-2g\hbar\omega_0\approx-800$ $meV$ are consistent with the possible formation of a bi-polaronic insulating phase consisting of alternating doubly-occupied/unoccupied dangling bonds as expected in the Holstein-Hubbard model.

Affiliated with

Also associated with

No associations

Rating

Surface state bi-polarons formation on a triangular lattice in the sp-type alkali/Si(111) Mott insulator does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Surface state bi-polarons formation on a triangular lattice in the sp-type alkali/Si(111) Mott insulator, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Surface state bi-polarons formation on a triangular lattice in the sp-type alkali/Si(111) Mott insulator will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-341905