Publications of Thomas Barthel    :chronological  combined listing:

%% Papers Published   
@article{fds302498,
   Author = {Cai, Z and Barthel, T},
   Title = {Algebraic versus Exponential Decoherence in Dissipative
             Many-Particle Systems.},
   Journal = {Physical Review Letters},
   Volume = {111},
   Number = {15},
   Pages = {150403},
   Year = {2013},
   Month = {October},
   ISSN = {0031-9007},
   url = {http://dx.doi.org/10.1103/physrevlett.111.150403},
   Abstract = {The interplay between dissipation and internal interactions
             in quantum many-body systems gives rise to a wealth of novel
             phenomena. Here we investigate spin-1/2 chains with uniform
             local couplings to a Markovian environment using the
             time-dependent density matrix renormalization group. For the
             open XXZ model, we discover that the decoherence time
             diverges in the thermodynamic limit. The coherence decay is
             then algebraic instead of exponential. This is due to a
             vanishing gap in the spectrum of the corresponding Liouville
             superoperator and can be explained on the basis of a
             perturbative treatment. In contrast, decoherence in the open
             transverse-field Ising model is found to be always
             exponential. In this case, the internal interactions can
             both facilitate and impede the environment-induced
             decoherence.},
   Doi = {10.1103/physrevlett.111.150403},
   Key = {fds302498}
}

@article{fds318404,
   Author = {Mölter, J and Barthel, T and Schollwöck, U and Alba,
             V},
   Title = {Bound states and entanglement in the excited states of
             quantum spin chains},
   Journal = {Journal of statistical mechanics (Online)},
   Volume = {2014},
   Number = {10},
   Pages = {P10029-P10029},
   Year = {2014},
   Month = {October},
   url = {http://dx.doi.org/10.1088/1742-5468/2014/10/P10029},
   Doi = {10.1088/1742-5468/2014/10/P10029},
   Key = {fds318404}
}

@article{fds302487,
   Author = {Barthel, T and Pineda, C and Eisert, J},
   Title = {Contraction of fermionic operator circuits and the
             simulation of strongly correlated fermions},
   Journal = {Physical Review A - Atomic, Molecular, and Optical
             Physics},
   Volume = {80},
   Number = {4},
   Year = {2009},
   Month = {October},
   ISSN = {1050-2947},
   url = {http://dx.doi.org/10.1103/PhysRevA.80.042333},
   Doi = {10.1103/PhysRevA.80.042333},
   Key = {fds302487}
}

@article{fds302492,
   Author = {Barthel, T and Schollwöck, U},
   Title = {Dephasing and the steady state in quantum many-particle
             systems.},
   Journal = {Physical Review Letters},
   Volume = {100},
   Number = {10},
   Pages = {100601},
   Year = {2008},
   Month = {March},
   ISSN = {0031-9007},
   url = {http://dx.doi.org/10.1103/physrevlett.100.100601},
   Abstract = {We discuss relaxation in bosonic and fermionic many-particle
             systems. For integrable systems, time evolution can cause a
             dephasing effect, leading for finite subsystems to steady
             states. We explicitly derive those steady subsystem states
             and devise sufficient prerequisites for the dephasing to
             occur. We also find simple scenarios, in which dephasing is
             ineffective and discuss the dependence on dimensionality and
             criticality. It follows further that, after a quench of
             system parameters, entanglement entropy will become
             extensive. This provides a way of creating strong
             entanglement in a controlled fashion.},
   Doi = {10.1103/physrevlett.100.100601},
   Key = {fds302492}
}

@article{fds302493,
   Author = {Kliesch, M and Barthel, T and Gogolin, C and Kastoryano, M and Eisert,
             J},
   Title = {Dissipative quantum Church-Turing theorem.},
   Journal = {Physical Review Letters},
   Volume = {107},
   Number = {12},
   Pages = {120501},
   Year = {2011},
   Month = {September},
   ISSN = {0031-9007},
   url = {http://dx.doi.org/10.1103/physrevlett.107.120501},
   Abstract = {We show that the time evolution of an open quantum system,
             described by a possibly time dependent Liouvillian, can be
             simulated by a unitary quantum circuit of a size scaling
             polynomially in the simulation time and the size of the
             system. An immediate consequence is that dissipative quantum
             computing is no more powerful than the unitary circuit
             model. Our result can be seen as a dissipative Church-Turing
             theorem, since it implies that under natural assumptions,
             such as weak coupling to an environment, the dynamics of an
             open quantum system can be simulated efficiently on a
             quantum computer. Formally, we introduce a Trotter
             decomposition for Liouvillian dynamics and give explicit
             error bounds. This constitutes a practical tool for
             numerical simulations, e.g., using matrix-product operators.
             We also demonstrate that most quantum states cannot be
             prepared efficiently.},
   Doi = {10.1103/physrevlett.107.120501},
   Key = {fds302493}
}

@article{fds302499,
   Author = {Halimeh, JC and Wöllert, A and McCulloch, I and Schollwöck, U and Barthel, T},
   Title = {Domain-wall melting in ultracold-boson systems with hole and
             spin-flip defects},
   Journal = {Physical Review A - Atomic, Molecular, and Optical
             Physics},
   Volume = {89},
   Number = {6},
   Year = {2014},
   Month = {June},
   ISSN = {1050-2947},
   url = {http://dx.doi.org/10.1103/PhysRevA.89.063603},
   Doi = {10.1103/PhysRevA.89.063603},
   Key = {fds302499}
}

@article{fds302485,
   Author = {Zhou, H-Q and Barthel, T and Fjærestad, JO and Schollwöck,
             U},
   Title = {Entanglement and boundary critical phenomena},
   Journal = {Physical Review A - Atomic, Molecular, and Optical
             Physics},
   Volume = {74},
   Number = {5},
   Year = {2006},
   Month = {November},
   ISSN = {1050-2947},
   url = {http://dx.doi.org/10.1103/PhysRevA.74.050305},
   Doi = {10.1103/PhysRevA.74.050305},
   Key = {fds302485}
}

@article{fds302491,
   Author = {Barthel, T and Dusuel, S and Vidal, J},
   Title = {Entanglement entropy beyond the free case.},
   Journal = {Physical Review Letters},
   Volume = {97},
   Number = {22},
   Pages = {220402},
   Year = {2006},
   Month = {December},
   ISSN = {0031-9007},
   url = {http://dx.doi.org/10.1103/physrevlett.97.220402},
   Abstract = {We present a perturbative method to compute the ground state
             entanglement entropy for interacting systems. We apply it to
             a collective model of mutually interacting spins in a
             magnetic field. At the quantum critical point, the
             entanglement entropy scales logarithmically with the
             subsystem size, the system size, and the anisotropy
             parameter. We determine the corresponding scaling prefactors
             and evaluate the leading finite-size correction to the
             entropy. Our analytical predictions are in perfect agreement
             with numerical results.},
   Doi = {10.1103/physrevlett.97.220402},
   Key = {fds302491}
}

@article{fds302484,
   Author = {Vidal, J and Dusuel, S and Barthel, T},
   Title = {Entanglement entropy in collective models},
   Journal = {Journal of statistical mechanics (Online)},
   Volume = {2007},
   Number = {01},
   Pages = {P01015-P01015},
   Year = {2007},
   Month = {January},
   url = {http://dx.doi.org/10.1088/1742-5468/2007/01/P01015},
   Doi = {10.1088/1742-5468/2007/01/P01015},
   Key = {fds302484}
}

@article{fds302486,
   Author = {Barthel, T and Chung, M-C and Schollwöck, U},
   Title = {Entanglement scaling in critical two-dimensional fermionic
             and bosonic systems},
   Journal = {Physical Review A - Atomic, Molecular, and Optical
             Physics},
   Volume = {74},
   Number = {2},
   Year = {2006},
   Month = {August},
   ISSN = {1050-2947},
   url = {http://dx.doi.org/10.1103/PhysRevA.74.022329},
   Doi = {10.1103/PhysRevA.74.022329},
   Key = {fds302486}
}

@article{fds302483,
   Author = {Kliesch, M and Barthel, T and Gogolin, C and Kastoryano, M and Eisert,
             J},
   Title = {Erratum: Dissipative Quantum Church-Turing Theorem [Phys.
             Rev. Lett. 107 , 120501 (2011)]},
   Journal = {Physical Review Letters},
   Volume = {109},
   Number = {11},
   Year = {2012},
   Month = {September},
   ISSN = {0031-9007},
   url = {http://dx.doi.org/10.1103/PhysRevLett.109.119904},
   Doi = {10.1103/PhysRevLett.109.119904},
   Key = {fds302483}
}

@article{fds318402,
   Author = {Gori, L and Barthel, T and Kumar, A and Lucioni, E and Tanzi, L and Inguscio, M and Modugno, G and Giamarchi, T and D'Errico, C and Roux,
             G},
   Title = {Finite-temperature effects on interacting bosonic
             one-dimensional systems in disordered lattices},
   Journal = {Physical Review A},
   Volume = {93},
   Number = {3},
   Year = {2016},
   Month = {March},
   url = {http://dx.doi.org/10.1103/PhysRevA.93.033650},
   Doi = {10.1103/PhysRevA.93.033650},
   Key = {fds318402}
}

@article{fds302496,
   Author = {Barthel, T and Kasztelan, C and McCulloch, IP and Schollwöck,
             U},
   Title = {Magnetism, coherent many-particle dynamics, and relaxation
             with ultracold bosons in optical superlattices},
   Journal = {Physical Review A - Atomic, Molecular, and Optical
             Physics},
   Volume = {79},
   Number = {5},
   Year = {2009},
   Month = {May},
   ISSN = {1050-2947},
   url = {http://dx.doi.org/10.1103/PhysRevA.79.053627},
   Doi = {10.1103/PhysRevA.79.053627},
   Key = {fds302496}
}

@article{fds322472,
   Author = {Barthel, T},
   Title = {Matrix product purifications for canonical ensembles and
             quantum number distributions},
   Journal = {Physical Review B},
   Volume = {94},
   Number = {11},
   Year = {2016},
   Month = {September},
   url = {http://dx.doi.org/10.1103/PhysRevB.94.115157},
   Doi = {10.1103/PhysRevB.94.115157},
   Key = {fds322472}
}

@article{fds302490,
   Author = {Binder, M and Barthel, T},
   Title = {Minimally entangled typical thermal states versus matrix
             product purifications for the simulation of equilibrium
             states and time evolution},
   Journal = {Physical Review B - Condensed Matter and Materials
             Physics},
   Volume = {92},
   Number = {12},
   Year = {2015},
   Month = {September},
   ISSN = {1098-0121},
   url = {http://dx.doi.org/10.1103/PhysRevB.92.125119},
   Doi = {10.1103/PhysRevB.92.125119},
   Key = {fds302490}
}

@article{fds302497,
   Author = {Lake, B and Tennant, DA and Caux, J-S and Barthel, T and Schollwöck, U and Nagler, SE and Frost, CD},
   Title = {Multispinon continua at zero and finite temperature in a
             near-ideal Heisenberg chain.},
   Journal = {Physical Review Letters},
   Volume = {111},
   Number = {13},
   Pages = {137205},
   Year = {2013},
   Month = {September},
   ISSN = {0031-9007},
   url = {http://dx.doi.org/10.1103/physrevlett.111.137205},
   Abstract = {The space-and time-dependent response of many-body quantum
             systems is the most informative aspect of their emergent
             behavior. The dynamical structure factor, experimentally
             measurable using neutron scattering, can map this response
             in wave vector and energy with great detail, allowing
             theories to be quantitatively tested to high accuracy. Here,
             we present a comparison between neutron scattering
             measurements on the one-dimensional spin-1/2 Heisenberg
             antiferromagnet KCuF3, and recent state-of-the-art
             theoretical methods based on integrability and density
             matrix renormalization group simulations. The unprecedented
             quantitative agreement shows that precise descriptions of
             strongly correlated states at all distance, time, and
             temperature scales are now possible, and highlights the need
             to apply these novel techniques to other problems in
             low-dimensional magnetism.},
   Doi = {10.1103/physrevlett.111.137205},
   Key = {fds302497}
}

@article{fds318403,
   Author = {Schlittler, T and Barthel, T and Misguich, G and Vidal, J and Mosseri,
             R},
   Title = {Phase Diagram of an Extended Quantum Dimer Model on the
             Hexagonal Lattice.},
   Journal = {Physical Review Letters},
   Volume = {115},
   Number = {21},
   Pages = {217202},
   Year = {2015},
   Month = {November},
   url = {http://dx.doi.org/10.1103/physrevlett.115.217202},
   Abstract = {We introduce a quantum dimer model on the hexagonal lattice
             that, in addition to the standard three-dimer kinetic and
             potential terms, includes a competing potential part
             counting dimer-free hexagons. The zero-temperature phase
             diagram is studied by means of quantum Monte Carlo
             simulations, supplemented by variational arguments. It
             reveals some new crystalline phases and a cascade of
             transitions with rapidly changing flux (tilt in the height
             language). We analyze perturbatively the vicinity of the
             Rokhsar-Kivelson point, showing that this model has the
             microscopic ingredients needed for the "devil's staircase"
             scenario [Eduardo Fradkin et al. Phys. Rev. B 69, 224415
             (2004)], and is therefore expected to produce fractal
             variations of the ground-state flux.},
   Doi = {10.1103/physrevlett.115.217202},
   Key = {fds318403}
}

@article{fds329759,
   Author = {Schlittler, T and Mosseri, R and Barthel, T},
   Title = {Phase diagram of the hexagonal lattice quantum dimer model:
             Order parameters, ground-state energy, and
             gaps},
   Journal = {Phys. Rev. B},
   Volume = {96},
   Pages = {195142-195142},
   Year = {2017},
   Month = {November},
   url = {http://dx.doi.org/10.1103/PhysRevB.96.195142},
   Abstract = {It is by now well-known that ground states of gapped
             one-dimensional (1d) quantum-many body systems with
             short-range interactions can be studied efficiently using
             classical computers and matrix product state techniques. A
             corresponding result for finite temperatures was missing.
             For 1d systems that can be described by a local 1+1d field
             theory, it is shown here that the cost for the classical
             simulation at finite temperatures grows in fact only
             polynomially with the inverse temperature and is system-size
             independent -- even for quantum critical systems. In
             particular, we show that the thermofield double state (TDS),
             a purification of the equilibrium density operator, can be
             obtained efficiently in matrix-product form. The argument is
             based on the scaling behavior of R\'{e}nyi entanglement
             entropies in the TDS. At finite temperatures, they obey the
             area law. For quantum critical systems, the entanglement is
             found to grow only logarithmically with inverse temperature,
             S~log(beta). The field-theoretical results are confirmed by
             quasi-exact numerical simulations of quantum magnets and
             interacting bosons.},
   Doi = {10.1103/PhysRevB.96.195142},
   Key = {fds329759}
}

@article{fds302500,
   Author = {Barthel, T},
   Title = {Precise evaluation of thermal response functions by
             optimized density matrix renormalization group
             schemes},
   Journal = {New Journal of Physics},
   Volume = {15},
   Number = {7},
   Pages = {073010-073010},
   Year = {2013},
   Month = {July},
   url = {http://dx.doi.org/10.1088/1367-2630/15/7/073010},
   Doi = {10.1088/1367-2630/15/7/073010},
   Key = {fds302500}
}

@article{fds302495,
   Author = {Barthel, T and Kliesch, M},
   Title = {Quasilocality and efficient simulation of markovian quantum
             dynamics.},
   Journal = {Physical Review Letters},
   Volume = {108},
   Number = {23},
   Pages = {230504},
   Year = {2012},
   Month = {June},
   ISSN = {0031-9007},
   url = {http://dx.doi.org/10.1103/physrevlett.108.230504},
   Abstract = {We consider open many-body systems governed by a
             time-dependent quantum master equation with short-range
             interactions. With a generalized Lieb-Robinson bound, we
             show that the evolution in this very generic framework is
             quasilocal; i.e., the evolution of observables can be
             approximated by implementing the dynamics only in a vicinity
             of the observables' support. The precision increases
             exponentially with the diameter of the considered subsystem.
             Hence, time evolution can be simulated on classical
             computers with a cost that is independent of the system
             size. Providing error bounds for Trotter decompositions, we
             conclude that the simulation on a quantum computer is
             additionally efficient in time. For experiments and
             simulations in the Schrödinger picture, our result can be
             used to rigorously bound finite-size effects.},
   Doi = {10.1103/physrevlett.108.230504},
   Key = {fds302495}
}

@article{fds302489,
   Author = {Roux, G and Barthel, T and McCulloch, IP and Kollath, C and Schollwöck,
             U and Giamarchi, T},
   Title = {Quasiperiodic Bose-Hubbard model and localization in
             one-dimensional cold atomic gases},
   Journal = {Physical Review A - Atomic, Molecular, and Optical
             Physics},
   Volume = {78},
   Number = {2},
   Year = {2008},
   Month = {August},
   ISSN = {1050-2947},
   url = {http://dx.doi.org/10.1103/PhysRevA.78.023628},
   Doi = {10.1103/PhysRevA.78.023628},
   Key = {fds302489}
}

@article{fds302488,
   Author = {Barthel, T and Kliesch, M and Eisert, J},
   Title = {Real-Space Renormalization Yields Finite
             Correlations},
   Journal = {Physical Review Letters},
   Volume = {105},
   Number = {1},
   Year = {2010},
   Month = {July},
   ISSN = {0031-9007},
   url = {http://dx.doi.org/10.1103/PhysRevLett.105.010502},
   Doi = {10.1103/PhysRevLett.105.010502},
   Key = {fds302488}
}

@article{fds302494,
   Author = {Barthel, T and Hübener, R},
   Title = {Solving condensed-matter ground-state problems by
             semidefinite relaxations.},
   Journal = {Physical Review Letters},
   Volume = {108},
   Number = {20},
   Pages = {200404},
   Year = {2012},
   Month = {May},
   ISSN = {0031-9007},
   url = {http://dx.doi.org/10.1103/physrevlett.108.200404},
   Abstract = {We present a generic approach to the condensed-matter
             ground-state problem which is complementary to variational
             techniques and works directly in the thermodynamic limit.
             Relaxing the ground-state problem, we obtain semidefinite
             programs (SDP). These can be solved efficiently, yielding
             strict lower bounds to the ground-state energy and
             approximations to the few-particle Green's functions. As the
             method is applicable for all particle statistics, it
             represents, in particular, a novel route for the study of
             strongly correlated fermionic and frustrated spin systems in
             D>1 spatial dimensions. It is demonstrated for the XXZ model
             and the Hubbard model of spinless fermions. The results are
             compared against exact solutions, quantum Monte Carlo
             calculations, and Anderson bounds, showing the
             competitiveness of the SDP method.},
   Doi = {10.1103/physrevlett.108.200404},
   Key = {fds302494}
}

@article{fds302501,
   Author = {Barthel, T and Schollwöck, U and White, SR},
   Title = {Spectral functions in one-dimensional quantum systems at
             finite temperature using the density matrix renormalization
             group},
   Journal = {Physical Review B - Condensed Matter and Materials
             Physics},
   Volume = {79},
   Number = {24},
   Year = {2009},
   Month = {June},
   ISSN = {1098-0121},
   url = {http://dx.doi.org/10.1103/PhysRevB.79.245101},
   Doi = {10.1103/PhysRevB.79.245101},
   Key = {fds302501}
}

@article{fds326914,
   Author = {Binder, M and Barthel, T},
   Title = {Symmetric minimally entangled typical thermal states for
             canonical and grand-canonical ensembles},
   Journal = {Physical Review B},
   Volume = {95},
   Number = {19},
   Year = {2017},
   Month = {May},
   url = {http://dx.doi.org/10.1103/PhysRevB.95.195148},
   Doi = {10.1103/PhysRevB.95.195148},
   Key = {fds326914}
}

@article{fds302482,
   Author = {Pineda, C and Barthel, T and Eisert, J},
   Title = {Unitary circuits for strongly correlated
             fermions},
   Journal = {Physical Review A - Atomic, Molecular, and Optical
             Physics},
   Volume = {81},
   Number = {5},
   Year = {2010},
   Month = {May},
   ISSN = {1050-2947},
   url = {http://dx.doi.org/10.1103/PhysRevA.81.050303},
   Doi = {10.1103/PhysRevA.81.050303},
   Key = {fds302482}
}