Zobrazeno 1 - 10
of 96
pro vyhledávání: '"Mielke, Andreas"'
Autor:
Mielke, Andreas
We consider quantum variants of Parrondo games on low-dimensional Hilbert spaces. The two games which form the Parrondo game are implemented as quantum walks on a small cycle of length $M$. The dimension of the Hilbert space is $2M$. We investigate a
Externí odkaz:
http://arxiv.org/abs/2306.16845
Autor:
Breuer, Sandro, Mielke, Andreas
In the original Parrondo game, a single player combines two losing strategies to a winning strategy. In this paper we investigate the question what happens, if two or more players play Parrondo games in a coordinated way. We introduce a strong coupli
Externí odkaz:
http://arxiv.org/abs/2303.01361
Autor:
Fronk, Jacob, Mielke, Andreas
Using a generalised version of Gershgorin's circle theorem, rigorous boundaries on the energies of the lowest states of a broad class of line graphs above a critical filling are derived for hardcore bosonic systems. Also a lower boundary on the energ
Externí odkaz:
http://arxiv.org/abs/2008.01756
Autor:
Mielke, Andreas
Publikováno v:
J. Stat. Phys. 171, 679-695 (2018)
Hard core bosons in a large class of one or two dimensional flat band systems have an upper critical density, below which the ground states can be described completely. At the critical density, the ground states are Wigner crystals. If one adds a par
Externí odkaz:
http://arxiv.org/abs/1708.02508
Autor:
Drescher, Moritz, Mielke, Andreas
We investigate the behaviour of hard-core bosons in one- and two-dimensional flat band systems, the chequerboard and the kagom\'e lattice and one-dimensional analogues thereof. The one dimensional systems have an exact local reflection symmetry which
Externí odkaz:
http://arxiv.org/abs/1704.03905
Autor:
Pudleiner, Petra, Mielke, Andreas
Publikováno v:
Eur. Phys. J. B 88, 207 (2015)
The Hubbard model of bosons on two dimensional lattices with a lowest flat band is discussed. In these systems there is a critical density, where the ground state is known exactly and can be represented as a charge density wave. Above this critical f
Externí odkaz:
http://arxiv.org/abs/1505.03912
Publikováno v:
Phys. Rev. Lett. 111, 175301 (2013)
We present a systematic construction of effective Hamiltonians of periodically driven quantum systems. Because of an equivalence between the time dependence of a Hamiltonian and an interaction in its Floquet operator, flow equations, that permit to d
Externí odkaz:
http://arxiv.org/abs/1304.3584
Autor:
Mielke, Andreas
We consider the repulsive Hubbard model on a class of lattices or graphs for which there is a large degeneracy of the single particle ground states and where the projector onto the space of single particle ground states is highly reducible. This mean
Externí odkaz:
http://arxiv.org/abs/1202.3158
Autor:
Mielke, Andreas
Diss.--Bochum--Universität, 1993.
Bibliogr. p. 546-575.
Bibliogr. p. 546-575.
Externí odkaz:
http://catalogue.bnf.fr/ark:/12148/cb37511424r
Autor:
Motruk, Johannes, Mielke, Andreas
Publikováno v:
J. Phys. A: Math. Theor. 45 (2012) 225206
We construct a basis for the many-particle ground states of the positive hopping Bose-Hubbard model on line graphs of finite 2-connected planar bipartite graphs at sufficiently low filling factors. The particles in these states are localized on non-i
Externí odkaz:
http://arxiv.org/abs/1112.0131