[Special seminar] Hyun-Jung Lee from POSTECH
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Title : Multifractality at the Anderson-Mott transition
Speaker : Hyun-Jung Lee from POSTECH
In this talk, we discuss non-ergodic (glassy) features exhibited in the vicinity of the
Anderson-Mott transition such as an increasing magnetic susceptibility and specific-heat
coefficient attributed to the formation of local moments. An important unresolved
question of the issue is how the local moments interact with the conduction electrons that
becomes localized at the metal-insulator transition, whose answer is of vital importance for
the interpretation of transport experiments in doped semiconductors such as Si:P, Si:P,B,
and Si:B.
In a theoretical point of view, it is a very difficult problem of constructing a self-consistent
theory for the metal-insulator transition that takes into account the disordered conduction
electrons, local moment formation and Kondo physics in disordered systems. As a first
step, we studied the interaction-driven localization transition of the disordered, Coulombinteracting
spinless fermions within the Hartree-Fock/Ewald method and performed a
multifractal scaling analysis to elucidate the quantum criticality at the Anderson-Mott
transition. The extension to the spinful case is also undertaken to look into the possibility
for long-range spin order or spin-glass phase near the metal-insulator transition, of which
we present preliminary results.
40개(1/2페이지)
