Zobrazeno 1 - 10
of 138
pro vyhledávání: '"Pereira R G"'
Publikováno v:
Phys. Rev. B 105, 024430 (2022)
The spin-1/2 transverse field two-leg Ising ladder with nearest-neighbor exchange and plaquette four-spin interaction $J_{4}$ is studied analytically and numerically with the density matrix renormalization group approach. The quantum phase diagram in
Externí odkaz:
http://arxiv.org/abs/2111.11404
Publikováno v:
Phys. Rev. B 103, 125152 (2021)
We study a quantum quench in which a magnetic impurity is suddenly coupled to Hubbard chains, whose low-energy physics is described by Tomonaga-Luttinger liquid theory. Using the time-dependent density-matrix renormalization-group (tDMRG) technique,
Externí odkaz:
http://arxiv.org/abs/2101.09344
Publikováno v:
Phys. Rev. B 100, 205131 (2019)
The SU(4)-symmetric spin-orbital model on the honeycomb lattice was recently studied in connection to correlated insulators such as the $e_{g}$ Mott insulator Ba$_{3}$CuSb$_{2}$O$_{9}$ and the insulating phase of magic-angle twisted bilayer graphene
Externí odkaz:
http://arxiv.org/abs/1908.09224
Publikováno v:
Nuclear Physics B 941, 794-837 (2019)
We study a Y junction of spin-1/2 Heisenberg chains with an interaction that breaks both time-reversal and chain exchange symmetries, but not their product nor SU(2) symmetry. The boundary phase diagram features a stable disconnected fixed point at w
Externí odkaz:
http://arxiv.org/abs/1811.06794
Publikováno v:
Phys. Rev. B 98, 155105 (2018)
We investigate the edge magnetism and the spin transport properties of an SU(2)-symmetric Kitaev spin liquid (KSL) model put forward by Yao and Lee [Phys. Rev. Lett. \textbf{107}, 087205 (2011)] on the honeycomb lattice. In this model, the spin degre
Externí odkaz:
http://arxiv.org/abs/1806.10809
Publikováno v:
Phys. Rev. B 97, 220402 (2018)
We show that a quantum spin circulator, a nonreciprocal device that routes spin currents without any charge transport, can be achieved in Y junctions of identical spin-$1/2$ Heisenberg chains coupled by a chiral three-spin interaction. Using bosoniza
Externí odkaz:
http://arxiv.org/abs/1801.04594
Publikováno v:
Phys. Rev. B 95, 045125 (2017)
We investigate the out-of-equilibrium dynamics after a local quench that connects two spin-1/2 XXZ chains prepared in the ground state of the Hamiltonian in different phases, one in the ferromagnetic phase and the other in the critical phase. We anal
Externí odkaz:
http://arxiv.org/abs/1609.01769
Autor:
Caracanhas, M. A., Pereira, R. G.
Publikováno v:
Phys. Rev. B 94, 220302 (2016)
Mobile impurities in cold atomic gases constitute a new platform for investigating polaron physics. Here we show that when impurity atoms interact with a two-dimensional Fermi gas with quadratic band touching the polaron picture may either hold or br
Externí odkaz:
http://arxiv.org/abs/1604.06249
Publikováno v:
Phys. Rev. B 93, 195129 (2016)
We study the influence of reflective boundaries on time-dependent responses of one-dimensional quantum fluids at zero temperature beyond the low-energy approximation. Our analysis is based on an extension of effective mobile impurity models for nonli
Externí odkaz:
http://arxiv.org/abs/1602.01679
Publikováno v:
Phys. Rev. Lett. 117, 017204 (2016)
Strongly correlated materials with strong spin-orbit coupling hold promise for realizing topological phases with fractionalized excitations. Here we propose a chiral spin-orbital liquid as a stable phase of a realistic model for heavy-element double
Externí odkaz:
http://arxiv.org/abs/1505.06171