ubc
Charge degrees of freedom on the kagome lattice
2011-09-22
[Electronic ed.]
prv
Universitätsbibliothek Chemnitz
Universitätsbibliothek Chemnitz, Chemnitz
Naturwissenschaften
Physik
female
Sydney
0 and t < 0. Exact diagonalization calculations are found to be consistent with the predictions of the effective model. Further calculations confirm that the sign of t is rendered inconsequential due to the gauge invariance for g in the regime |t| << V . The charge-order melting metal-insulator transition is studied through density-matrix renormalization group calculations. The opening of the energy gap is found to differ for the two signs of t, reflecting the difference in the band structure at the Fermi level in each case. The qualitative nature of transition in each case is discussed.
As a step towards a realization of the model in experiment, density-density correlation functions are introduced and such a calculation is shown for the plaquette phase for the effective model Hamiltonian at 1/3 filling in the absence of defects. Finally, the open problem of statistics of the fractional charges is discussed.]]>
530
Physik, Festkörper
Festkörper, Physik
Strongly correlated electron systems
Lattice fermion models
Metal-insulator transitions
urn:nbn:de:bsz:ch1-qucosa-71860
Technischen Universitaet Chemnitz
dgg
Technischen Universitaet Chemnitz, Chemnitz
Aroon
O'Brien
1985-09-01
aut
Michael
Schreiber
Prof. Dr.
dgs
rev
Peter
Fulde
Prof. Dr.
dgs
rev
eng
2010-10-18
2010-12-20
born digital
Ladungsfreiheitsgrade auf dem Kagome Gitter
Aroon O'Brien
+49 351 871 1124
aroonobrien@hotmail.com
doctoral_thesis