Zobrazeno 1 - 10
of 3 658
pro vyhledávání: '"Prokof'ev, A. A."'
We investigate the zero-temperature phase diagram of the one-dimensional Bose-Hubbard model with power-law hopping decaying with distance as $1/r^\alpha$ using exact large scale Quantum Monte-Carlo simulations. For all $1<\alpha\leq 3$ the quantum ph
Externí odkaz:
http://arxiv.org/abs/2412.01571
Autor:
Tupitsyn, I. S., Prokof'ev, N. V.
Bethe-Salpeter equation (BSE) in the self-consistent Hartree-Fock (HF) basis is often used for describing complex many-body effects in material science applications. Its exact solution on the real-frequency axis at finite temperature for polarization
Externí odkaz:
http://arxiv.org/abs/2411.08825
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
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:
Rossi, R., Simkovic IV, F., Ferrero, M., Georges, A., Tsvelik, A. M., Prokof'ev, N. V., Tupitsyn, I. S.
Publikováno v:
Phys. Rev. Research 6, L032058 (2024)
The spin-fermion (SF) model postulates that the dominant coupling between low-energy fermions in near critical metals is mediated by collective spin fluctuations (paramagnons) peaked at the N\'{e}el wave vector, ${\bf Q}_N$, connecting hot spots on o
Externí odkaz:
http://arxiv.org/abs/2402.13238
Autor:
Tupitsyn, I. S., Prokof'ev, N. V.
Material science methods aim at developing efficient computational schemes for describing complex many-body effects and how they are revealed in experimentally measurable properties. Bethe-Salpeter equation in the self-consistent Hartree-Fock basis i
Externí odkaz:
http://arxiv.org/abs/2311.05611
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