16 research outputs found
Excitation spectrum and quantum phase transitions in the one-dimensional ionic Hubbard model
Strongly correlated electron systems are one of the most fascinating problems in
current physics. The strong electron-electron interaction in these materials leads to
the emergence of nontrivial elementary excitations (quasiparticles, QPs) above the ground state
ranging from fractional spins in quasi-one-dimensional materials to magnetic monopole in
the pyrochlore lattice. The condensation of these quasiparticles upon changing some external
parameters may stabilize new exotic states of matter. Experimental measurements such as
inelastic neutron scattering provide us with valuable information about the excitation
spectrum of such systems which require microscopic models to be described.
This thesis is devoted to a detailed analysis of the excitation spectrum and of the quantum
phase transitions in the one-dimensional (1D) ionic Hubbard model (IHM). The IHM
consists of a nearest-neighbor (n.n.) hopping, onsite Hubbard interaction, and an
ionic (staggered) potential separating the odd and even sites energetically.
The model
exhibits two continuous phase transitions on increasing the Hubbard interaction identified
by a low-energy effective field theory and confirmed by a rigorous density matrix renormalization
group (DMRG) analysis after several attempts. The first transition occurs from band insulator
(BI) phase to the 2-fold degenerate spontaneously dimerized insulator (SDI) phase.
The transition is in the Ising universality class as is plausible from symmetry considerations.
The SDI phase becomes unstable towards a quasi-long-range order Mott insulator (MI) phase at
a second transition point resembling the Kosterlitz-Thouless (KT) transition in the frustrated Heisenberg
chain.
We employ continuous unitary transformations (CUT) to systematically map the IHM to
effective Hamiltonians (almost) conserving the number of QPs in the system. Using
an analysis in the BI regime where electrons and holes define QPs, the low-energy excitation
spectrum of the model is quantitatively determined in the BI phase almost up to the
first transition point. The transition from the BI to the SDI phase is signaled by the vanishing of
an S=0 exciton mode at the total momentum K=\pi. The condensation of these excitons
beyond the first transition point is described by a BCS-type-theory showing the stabilization
of the SDI phase. The mean-field solution indicates no second phase transition to the
quasi-long-range order MI phase. This is interpreted as the effect of strong quantum
fluctuations in one dimension.
We consider the IHM in the dimer limit where the uniform chain is separated into independent dimers.
The different phases of the IHM are studied by increasing the interdimer hopping and reaching
the uniform limit. This dimer limit satisfactorily produces the excitation spectrum of the BI phase
confirming the vanishing of an S=0 exciton mode at the first transition point.
It is found that
the SDI-to-MI transition takes place by softening of a magnetic S=1 excitation, i.e., a triplon.
We report rigorous results for the gapless triplon dispersion in the MI phase and
discuss the binding effects in the 2-triplon sector
A simplified approach to the magnetic blue shift of Mott gaps
The antiferromagnetic ordering in Mott insulators upon lowering the
temperature is accompanied by a transfer of the single-particle spectral weight
to lower energies and a shift of the Mott gap to higher energies (magnetic blue
shift, MBS). The MBS is governed by the double exchange and the exchange
mechanisms. Both mechanisms enhance the MBS upon increasing the number of
orbitals. We provide an expansion for the MBS in terms of hopping and exchange
coupling of a prototype Hubbard-Kondo-Heisenberg model and discuss how the
results can be generalized for application to realistic Mott or charge-transfer
insulator materials. This allows estimating the MBS of the charge gap in real
materials in an extremely simple way avoiding extensive theoretical
calculations. The approach is exemplarily applied to -MnTe, NiO, and
BiFeO and an MBS of about meV, meV, and meV is found,
respectively. The values are compared with the previous theoretical
calculations and the available experimental data. Our ready-to-use formula for
the MBS simplifies the future studies searching for materials with a strong
coupling between the antiferromagnetic ordering and the charge excitations,
which is paramount to realize a coupled spin-charge coherent dynamics at a
femtosecond time scale.Comment: 16 pages, 13 figure
Antiferromagnetic Chern insulator in centrosymmetric systems
An antiferromagnetic Chern insulator (AFCI) can exist if the effect of the
time-reversal transformation on the electronic state cannot be compensated by a
space group operation. The AFCI state with collinear magnetic order is already
realized in noncentrosymmetric honeycomb structures through the
Kane-Mele-Hubbard model. In this paper, we demonstrate the existence of the
collinear AFCI in a square lattice model which preserves the inversion
symmetry. Our study relies on the time-reversal-invariant
Harper-Hofstadter-Hubbard model extended by a next-nearest-neighbor hopping
term including spin-orbit coupling and a checkerboard potential. We show that
an easy -axis AFCI appears between the band insulator at weak and the easy
-plane AF Mott insulator at strong Hubbard repulsion provided the
checkerboard potential is large enough. The close similarity between our
results and the results obtained for the noncentrosymmetric Kane-Mele-Hubbard
model suggests the AFCI as a generic consequence of spin-orbit coupling and
strong electronic correlation which exists beyond a specific model or lattice
structure. An AFCI with the electronic and the magnetic properties originating
from the same strongly interacting electrons is promising candidate for a
strong magnetic blue shift of the charge gap below the N\'eel temperature and
for realizing the quantum anomalous Hall effect at higher temperatures so that
applications for data processing become possible.Comment: 14 pages, 9 figure
Magnetic blue shift of Mott gaps enhanced by double exchange
A substantial energy gap of charge excitations induced by strong correlations is the characteristic feature of Mott insulators. We study how the Mott gap is affected by long-range antiferromagnetic order. Our key finding is that the Mott gap is increased by the magnetic ordering: A magnetic blue shift (MBS) occurs. Thus the effect is proportional to the exchange coupling in the leading order in the Hubbard model. In systems with additional localized spins the double-exchange mechanism induces an additional contribution to the MBS which is proportional to the hopping in the leading order. The coupling between spin and charge degrees of freedom bears the potential to enable spin-to-charge conversion in Mott systems on extreme time scales determined by hopping and exchange only, since a spin-orbit-mediated transfer of angular momentum is not involved in the process. In view of spintronic and magnonic applications, it is highly promising to observe that several entire classes of compounds show exchange and double-exchange effects. Exemplarily, we show that the magnetic contribution to the band-gap blue shift observed in the optical conductivity of α-MnTe is correctly interpreted as the MBS of a Mott gap
From Gapped Excitons to Gapless Triplons in One Dimension
Often, exotic phases appear in the phase diagrams between conventional
phases. Their elementary excitations are of particular interest. Here, we
consider the example of the ionic Hubbard model in one dimension. This model is
a band insulator (BI) for weak interaction and a Mott insulator (MI) for strong
interaction. Inbetween, a spontaneously dimerized insulator (SDI) occurs which
is governed by energetically low-lying charge and spin degrees of freedom.
Applying a systematically controlled version of the continuous unitary
transformations (CUTs) we are able to determine the dispersions of the
elementary charge and spin excitations and of their most relevant bound states
on equal footing. The key idea is to start from an externally dimerized system
using the relative weak interdimer coupling as small expansion parameter which
finally is set to unity to recover the original model.Comment: 18 pages, 10 figure