Zobrazeno 1 - 10
of 2 124
pro vyhledávání: '"Svistunov, A. A."'
We employ the diagrammatic Monte Carlo method based on lattice path-integral representaion of the particle sector and real-space diagrammatics of the phonon sector to study effects of optical phonon dispersion on Bose-Einstein condensation of bipolar
Externí odkaz:
http://arxiv.org/abs/2409.14132
In systems with linear electron-phonon interaction (EPI), bound states of polarons, or bipolarons, form by gaining energy from the lattice deformation. The quadratic EPI case is fundamentally different: bipolarons form because electrons lose less ene
Externí odkaz:
http://arxiv.org/abs/2408.03266
While the properties of standard (single-component) superfluids are well understood, principal differences arise in a special type of multicomponent systems -- the so-called Borromean supercounterfluids -- in which (i) supertransport is possible only
Externí odkaz:
http://arxiv.org/abs/2406.12833
Superclimbing dynamics is the signature feature of transverse quantum fluids describing wide superfluid one-dimensional interfaces and/or edges with negligible Peierls barrier. Using Lagrangian formalism, we show how the essence of the superclimb phe
Externí odkaz:
http://arxiv.org/abs/2404.18290
Even when ideal solids are insulating, their states with crystallographic defects may have superfluid properties. It became clear recently that edge dislocations in $^4$He featuring a combination of microscopic quantum roughness and superfluidity of
Externí odkaz:
http://arxiv.org/abs/2404.15480
Publikováno v:
PhysRevB.109.214519 (2024)
Superclimbing modes are hallmark degrees of freedom of transverse quantum fluids describing wide superfluid one-dimensional interfaces and/or edges with negligible Peierls barrier. We report the first direct numeric evidence of quantum shape fluctuat
Externí odkaz:
http://arxiv.org/abs/2404.03465
Autor:
Babaev, Egor, Svistunov, Boris
Counterflow superfluidity in a system with $N\geq 3$ components is distinctively different from the $N=2$ case. The key feature is the difference between the number ($N$) of elementary vortex excitations and the number ($N-1$) of independent branches
Externí odkaz:
http://arxiv.org/abs/2311.04340
Publikováno v:
Phys. Rev. A 109, L011302 (2024)
We study universal off-diagonal correlations in transverse quantum fluids (TQF) -- a new class of quasi-one-dimensional superfluids featuring long-range-ordered ground states. These exhibit unique self-similar space-time relations scaling with $x^2/D
Externí odkaz:
http://arxiv.org/abs/2310.19875
Publikováno v:
Phys. Rev. B 108, 245127 (2023)
We present the first numerically exact study of self-trapped, a.k.a. soliton, states of electrons that form in materials with strong quadratic coupling to the phonon coordinates. Previous studies failed to observe predictions based on the variational
Externí odkaz:
http://arxiv.org/abs/2309.10669
Publikováno v:
Phys. Rev. B 109, L100502(2024)
Motivated by remarkable properties of superfluid edge dislocations in solid Helium-4, we discuss a broad class of quantum systems -- boundaries in phase separated lattice states, magnetic domain walls, and ensembles of Luttinger liquids -- that can b
Externí odkaz:
http://arxiv.org/abs/2309.02501