Zobrazeno 1 - 10
of 154
pro vyhledávání: '"Brand, Joachim"'
Autor:
Major, Jan, Brand, Joachim
Soliton-like localised wave solutions in a two-dimensional Fermi superfluid are studied by solving the Bogoliubov-de Gennes equations in the BCS regime of weak pairing interactions. The dispersion relations of these solitons are found to exhibit a pe
Externí odkaz:
http://arxiv.org/abs/2405.08184
Autor:
Choudhury, Sarthak, Brand, Joachim
Publikováno v:
Phys. Rev. A 107, 053314 (2023)
We analyze the effect of a hard wall trapping potential on the dynamics of a vortex molecule in a two-component Bose-Einstein condensate with linear coherent coupling. A vortex molecule consists of a vortex of the same charge in each component conden
Externí odkaz:
http://arxiv.org/abs/2212.07131
Publikováno v:
SciPost Phys. 14, 115 (2023)
A topological superfluid phase characterized by an emergent chiral-p-wave pair potential is expected to form in a two-dimensional Fermi superfluid subject to s-wave pairing, spin-orbit coupling and a large-enough Zeeman splitting. Andreev bound state
Externí odkaz:
http://arxiv.org/abs/2209.08766
Autor:
Choudhury, Sarthak, Brand, Joachim
Publikováno v:
Phys. Rev. A 106, 043319 (2022)
A vortex molecule is a topological excitation in two coherently coupled superfluids consisting of a vortex in each superfluid connected by a domain wall of the relative phase, also known as a Josephson vortex. We investigate the dynamics of this exci
Externí odkaz:
http://arxiv.org/abs/2207.05893
Autor:
Rammelmüller, Lukas, Huber, David, Čufar, Matija, Brand, Joachim, Hammer, Hans-Werner, Volosniev, Artem G.
Publikováno v:
SciPost Phys. 14, 006 (2023)
We present a numerical analysis of spin-$\frac{1}{2}$ fermions in a one-dimensional harmonic potential in the presence of a magnetic point-like impurity at the center of the trap. The model represents a few-body analogue of a magnetic impurity in the
Externí odkaz:
http://arxiv.org/abs/2204.01606
Publikováno v:
Condens. Matter 2022, 7(1), 15
We present exact numerical data for the lowest-energy momentum eigenstates (yrast states) of a repulsive spin impurity in a one-dimensional Bose gas using full configuration interaction quantum Monte Carlo (FCIQMC). As a stochastic extension to exact
Externí odkaz:
http://arxiv.org/abs/2112.11603
Publikováno v:
SciPost Phys. 12, 167 (2022)
We theoretically study spin-$1/2$ fermions confined to two spatial dimensions and experiencing isotropic short-range attraction in the presence of both spin-orbit coupling and Zeeman spin splitting - a prototypical system for developing topological s
Externí odkaz:
http://arxiv.org/abs/2112.09336
Publikováno v:
Phys. Rev. B 105, 235144 (2022)
We investigate a systematic statistical bias found in full configuration quantum Monte Carlo (FCIQMC) that originates from controlling a walker population with a fluctuating shift parameter. This bias can become the dominant error when the sign probl
Externí odkaz:
http://arxiv.org/abs/2103.07800
Publikováno v:
Phys. Rev. Research 3, 023142 (2021)
We study properties of the lowest energy states at non-zero total momentum (yrast states) of the Hubbard model for spin-1/2 fermions in the quantum ring configuration with attractive on-site interaction at low density. In the one-dimensional (1D) cas
Externí odkaz:
http://arxiv.org/abs/2011.14538
Publikováno v:
J. Chem. Phys. 153, 174103 (2020)
Full configuration interaction quantum Monte Carlo (FCIQMC) is a stochastic approach for finding the ground state of a quantum many-body Hamiltonian. It is based on the dynamical evolution of a walker population in Hilbert space, which samples the gr
Externí odkaz:
http://arxiv.org/abs/2008.01927