Zobrazeno 1 - 10
of 323
pro vyhledávání: '"Schollwoeck, U."'
Publikováno v:
Phys. Rev. B 109, 155124 (2024)
Real-time calculations in tensor networks are strongly limited in time by entanglement growth, restricting the achievable frequency resolution of Green's functions, spectral functions, self-energies, and other related quantities. By extending the tim
Externí odkaz:
http://arxiv.org/abs/2312.11705
Publikováno v:
Phys. Rev. Lett. 122, 250601 (2019)
We consider sudden quenches across quantum phase transitions in the $S=1$ XXZ model starting from the Haldane phase. We demonstrate that dynamical phase transitions may occur during these quenches that are identified by nonanalyticities in the rate f
Externí odkaz:
http://arxiv.org/abs/1904.00867
Autor:
Mena, M., Hänni, N., Ward, S., Hirtenlechner, E., Bewley, R., Hubig, C., Schollwöck, U., Normand, B., Krämer, K. W., McMorrow, D. F., Rüegg, Ch.
Publikováno v:
Phys. Rev. Lett. 124, 257201 (2020)
We have used neutron spectroscopy to investigate the spin dynamics of the quantum (S = 1/2) antiferromagnetic Ising chains in RbCoCl3. The structure and magnetic interactions in this material conspire to produce two magnetic phase transitions at low
Externí odkaz:
http://arxiv.org/abs/1811.07178
Publikováno v:
Phys. Rev. B 99, 075145 (2019)
We study the nonequilibrium dynamics of a one-dimensional topological Kondo insulator, modelled by a $p$-wave Anderson lattice model, following a quantum quench of the on-site interaction strength. Our goal is to examine how the quench influences the
Externí odkaz:
http://arxiv.org/abs/1810.09799
Publikováno v:
Phys. Rev. B 97, 045125 (2018)
We introduce a new error measure for matrix-product states without requiring the relatively costly two-site density matrix renormalization group (2DMRG). This error measure is based on an approximation of the full variance $\langle \psi | ( \hat H -
Externí odkaz:
http://arxiv.org/abs/1711.01104
Akademický článek
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Publikováno v:
Phys. Rev. B 95, 035129 (2017)
Matrix Product Operators (MPOs) are at the heart of the second-generation Density Matrix Renormalisation Group (DMRG) algorithm formulated in Matrix Product State language. We first summarise the widely known facts on MPO arithmetic and representatio
Externí odkaz:
http://arxiv.org/abs/1611.02498
Publikováno v:
Phys. Rev. A 94, 063628 (2016)
We study the quantum phases of bosons with repulsive contact interactions on a two-leg ladder in the presence of a uniform Abelian gauge field. The model realizes many interesting states, including Meissner phases, vortex-fluids, vortex-lattices, cha
Externí odkaz:
http://arxiv.org/abs/1610.02435
Publikováno v:
New J. Phys. 17 (2015) 092001
We perform a density-matrix renormalization-group study of strongly interacting bosons on a three-leg ladder in the presence of a homogeneous flux. Focusing on one-third filling, we explore the phase diagram in dependence of the magnetic flux and the
Externí odkaz:
http://arxiv.org/abs/1506.07430
Publikováno v:
Phys. Rev. Lett. 115, 190402 (2015)
The interplay between spontaneous symmetry breaking in many-body systems, the wavelike nature of quantum particles and lattice effects produces an extraordinary behavior of the chiral current of bosonic particles in the presence of a uniform magnetic
Externí odkaz:
http://arxiv.org/abs/1504.06564