Zobrazeno 1 - 10
of 429
pro vyhledávání: '"Vekua, A."'
Publikováno v:
Phys. Rev. B 100, 094428 (2019)
Quantum phase transitions are studied in the non-chiral $p$-clock chain, and a new explicitly U(1)-symmetric clock model, by monitoring the ground-state fidelity susceptibility. For $p\ge 5$, the self-dual $\mathbb{Z}_p$-symmetric chain displays a do
Externí odkaz:
http://arxiv.org/abs/1907.09082
Autor:
Natalya N. Vekua, Ekaterina A. Mamaeva
Publikováno v:
RUDN Journal of Informatization in Education, Vol 19, Iss 2, Pp 108-120 (2022)
Problem and goal. Development of linguistic diversity, creative ideas in foreign language communication are key areas of international activity supported at the level of the United Nations. An important condition for effectiveness of any dialogue is
Externí odkaz:
https://doaj.org/article/31d8d49ec2ef47ff96e750e99ae2dc3a
Autor:
Greschner, S., Vekua, T.
Publikováno v:
Phys. Rev. Lett. 119, 073401 (2017)
Two-leg bosonic ladders with flux harbor a remarkable vortex-hole duality between the weak-coupling vortex lattice superfluids and strong-coupling charge-density-wave crystals. The strong-coupling crystalline states, which are realized in the vicinit
Externí odkaz:
http://arxiv.org/abs/1704.06517
Autor:
Vekua, Temo
Publikováno v:
Phys. Rev. B 95, 115143 (2017)
We study critical singularities in the d-wave-like superconducting phase of the hole-doped Hubbard model of repulsively interacting electrons, defined on a two-leg ladder, induced by a magnetic field applied parallel to the ladder plane. We argue tha
Externí odkaz:
http://arxiv.org/abs/1611.10265
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
Autor:
Vekua, Temo, Sun, Gaoyong
Publikováno v:
Phys. Rev. B 94, 014417 (2016)
Exact asymptotic expressions of the uniform parts of the two-point correlation functions of bilinear spin operators in the Heisenberg antiferromagnetic spin-$\frac{1}{2}$ chain are obtained. Apart from the algebraic decay, the logarithmic contributio
Externí odkaz:
http://arxiv.org/abs/1604.00939
Publikováno v:
Phys. Rev. B 93, 205137 (2016)
By decreasing the transversal confinement potential in interacting one-dimensional spinless electrons and populating the second energetically lowest sub-band, for not too strong interactions system transitions into a quasi-one-dimensional state with
Externí odkaz:
http://arxiv.org/abs/1601.02951
Publikováno v:
Phys. Rev. B 92, 184421 (2015)
The ground-state phase diagram of Heisenberg spin-1/2 system on a two-leg ladder with rung alternation is studied by combining analytical approaches with numerical simulations. For the case of ferromagnetic leg exchanges a unique ferrimagnetic ground
Externí odkaz:
http://arxiv.org/abs/1509.04062
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
Autor:
Piraud, M., Heidrich-Meisner, F., McCulloch, I. P., Greschner, S., Vekua, T., Schollwoeck, U.
Publikováno v:
Phys. Rev. B 91, 140406(R), 2015
We establish the phase diagram of the strongly-interacting Bose-Hubbard model defined on a two-leg ladder geometry in the presence of a homogeneous flux. Our work is motivated by a recent experiment [Atala et al., Nature Phys. 10, 588 (2014)], which
Externí odkaz:
http://arxiv.org/abs/1409.7016