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Robustness of a perturbed topological phase.

- S. Dusuel, M. Kamfor, R. Orús, K. Schmidt, J. Vidal
- Physics, MathematicsPhysical review letters
- 8 December 2010

We investigate the stability of the topological phase of the toric code model in the presence of a uniform magnetic field by means of variational and high-order series expansion approaches. We find… Expand

Low-energy effective theory of the toric code model in a parallel magnetic field

- J. Vidal, S. Dusuel, K. Schmidt
- Physics
- 3 July 2008

We determine analytically the phase diagram of the toric code model in a parallel magnetic field which displays three distinct regions. Our study relies on two high-order perturbative expansions in… Expand

Effective models for gapped phases of strongly correlated quantum lattice models

- H.Y.Yang, K. Schmidt
- Physics
- 1 September 2010

We present a robust scheme to derive effective models non-perturbatively for quantum lattice models when at least one degree of freedom is gapped. A combination of graph theory and the method of… Expand

Magnetization of SrCu2(BO3)2 in ultrahigh magnetic fields up to 118 T.

- Y. Matsuda, N. Abe,
+7 authors F. Mila - PhysicsPhysical review letters
- 19 August 2013

TLDR

The structure of operators in effective particle-conserving models

- C. Knetter, K. Schmidt, G. Uhrig
- Physics
- 12 June 2003

For many-particle systems defined on lattices we investigate the global structure of effective Hamiltonians and observables obtained by means of a suitable basis transformation. We study… Expand

Disorder by disorder and flat bands in the kagome transverse field Ising model

- M. Powalski, K. Coester, R. Moessner, K. Schmidt
- Physics
- 4 December 2012

We study the transverse field Ising model on a kagome and a triangular lattice using high-order series expansions about the high-field limit. For the triangular lattice our results confirm a… Expand

High order perturbation theory for spectral densities of multi-particle excitations: $\mathsf{S = \frac{1}{2}}$ two-leg Heisenberg ladder

- C. Knetter, K. Schmidt, G. Uhrig
- Physics
- 1 December 2003

Abstract.We present a high order perturbation approach to quantitatively calculate spectral densities in three distinct steps starting from the model Hamiltonian and the observables of interest. The… Expand

Mott physics in the half-filled Hubbard model on a family of vortex-full square lattices

- D. Ixert, F. Assaad, K. Schmidt
- Physics
- 31 July 2014

We study the half-filled Hubbard model on a one-parameter family of vortex-full square lattices ranging from the isotropic case to weakly coupled Hubbard dimers. The ground-state phase diagram… Expand

Spectral Properties of Quasi One-dimensional Quantum Antiferromagnets . Perturbative Continuous Unitary Transformations

- K. Schmidt
- Physics
- 2004

In this work a perturbative realization of particle conserving continuous unitary transformations is applied to study the energies and the spectral properties of quasi one-dimensional quantum… Expand

Direct observation of the Higgs amplitude mode in a two-dimensional quantum antiferromagnet near the quantum critical point

- T. Hong, M. Matsumoto,
+12 authors D. Tennant - Physics
- 15 March 2017

Spontaneous symmetry-breaking quantum phase transitions play an essential role in condensed matter physics. The collective excitations in the broken-symmetry phase near the quantum critical point can… Expand

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