Zobrazeno 1 - 10
of 100
pro vyhledávání: '"Hirano, Takaaki"'
Publikováno v:
In Journal of Molecular Liquids 15 May 2024 402
Autor:
Abe, Hiroshi, Kobayashi, Shin, Ogawa, Kohei, Imai, Kanta, Koshiji, Kaito, Hoshino, Miku, Hirano, Takaaki, Hata, Yoshiaki, Kishimura, Hiroaki, Uruichi, Mikio
Publikováno v:
In Chemical Physics 1 June 2023 570
Publikováno v:
In Journal of Molecular Liquids 1 December 2022 367 Part A
Autor:
Hirano, Takaaki, Hanamura, Hitoshi, Inoue, Munenori, Ueda, Saori, Watanabe, Makoto, Tanabiki, Masao, Mikami, Koichiro
Publikováno v:
In Polymer 26 August 2019 177:282-289
Publikováno v:
Quantum Information Processing, vol. 7, no. 4, pp.153-174 (2008).
We study the inhomogeneous generalization of a 1-dimensional AKLT spin chain model. Spins at each lattice site could be different. Under certain conditions, the ground state of this AKLT model is unique and is described by the Valence-Bond-Solid (VBS
Externí odkaz:
http://arxiv.org/abs/0804.1741
Publikováno v:
Phys. Rev. B 78, 054431 (2008)
We have discussed a consistency condition of Berry phases defined by a local gauge twist and spatial symmetries of the many body system. It imposes a non trivial gap closing condition under the gauge twist in both finite- and infinite-size systems. I
Externí odkaz:
http://arxiv.org/abs/0803.3185
Publikováno v:
Jour. Stat. Phys. vol 133, no. 2, 347-377 (2008)
We study a 1-dimensional AKLT spin chain, consisting of spins $S$ in the bulk and $S/2$ at both ends. The unique ground state of this AKLT model is described by the Valence-Bond-Solid (VBS) state. We investigate the density matrix of a contiguous blo
Externí odkaz:
http://arxiv.org/abs/0802.3221
Publikováno v:
J. Phys. A:Math & Theor. 41, 135304(2008).
We investigate entanglement properties in the ground state of the open/periodic SU($n$) generalized valence-bond-solid state consisting of representations of SU($n$). We obtain exact expression for the reduced density matrix of a block of contiguous
Externí odkaz:
http://arxiv.org/abs/0711.3882
Publikováno v:
Phys. Rev. B 77, 094431 (2008)
We characterize several phases of gapped spin systems by local order parameters defined by quantized Berry phases. This characterization is topologically stable against any small perturbation as long as the energy gap remains finite. The models we pi
Externí odkaz:
http://arxiv.org/abs/0710.4198
Autor:
Hirano, Takaaki, Hatsugai, Yasuhiro
Publikováno v:
J. Phys. Soc. Jpn., Vol.76, 074603 (2007)
We investigate the entanglement entropy (EE) of gapped S=1 and $S=1/2$ spin chains with dimerization. We find that the effective boundary degrees of freedom as edge states contribute significantly to the EE. For the $S=1/2$ dimerized Heisenberg chain
Externí odkaz:
http://arxiv.org/abs/cond-mat/0703642