Zobrazeno 1 - 10
of 269
pro vyhledávání: '"Bruun, G."'
The properties and experimental identification of quantum spin liquids (QSL) remains an important topic with many fundamental questions. Here, we explore the dynamics of a single charge dopant (hole) in a $t$-$J_{1}$-$J_{2}$ model on a square lattice
Externí odkaz:
http://arxiv.org/abs/2407.06816
The physics of impurities in a bosonic quantum environment is a paradigmatic and challenging many-body problem that remains to be understood in its full complexity. Here, this problem is investigated for impurities with strong repulsive interactions
Externí odkaz:
http://arxiv.org/abs/2310.18183
Publikováno v:
Phys. Rev. Lett. 129, 246601 (2022)
We develop a nonperturbative theory for hole dynamics in antiferromagnetic spin lattices, as described by the $t$-$J$ model. This is achieved by generalizing the selfconsistent Born approximation to nonequilibrium systems, making it possible to calcu
Externí odkaz:
http://arxiv.org/abs/2203.04789
Publikováno v:
Phys. Rev. Lett. 129, 153401 (2022)
We explore the interaction between two trapped ions mediated by a surrounding quantum degenerate Bose or Fermi gas. Using perturbation theory valid for weak atom-ion interaction, we show analytically that the interaction mediated by a Bose gas has a
Externí odkaz:
http://arxiv.org/abs/2203.02768
Publikováno v:
Phys. Rev. B 104, 155136 (2021)
The properties of mobile impurities in quantum magnets are fundamental for our understanding of strongly correlated materials and may play a key role in the physics of high-temperature superconductivity. Hereby, the motion of hole-like defects throug
Externí odkaz:
http://arxiv.org/abs/2106.14510
Publikováno v:
Phys. Rev. B 103, 245106 (2021)
We study the Hall response of topologically-trivial mobile impurities (Fermi polarons) interacting weakly with majority fermions forming a Chern-insulator background. This setting involves a rich interplay between the genuine many-body character of t
Externí odkaz:
http://arxiv.org/abs/2102.08407
Publikováno v:
Phys. Rev. Lett. 126, 127405 (2021)
Realising strong photon-photon interactions in a solid-state setting is a major goal with far reaching potential for optoelectronic applications. Using Landau's quasiparticle framework combined with a microscopic many-body theory, we explore the inte
Externí odkaz:
http://arxiv.org/abs/2008.10303
Publikováno v:
Phys. Rev. Research 2, 033385 (2020)
Realising and probing topological superfluids is a key goal for fundamental science, with exciting technological promises. Here, we show that chiral $p_x+ip_y$ pairing in a two-dimensional topological superfluid can be detected through circular dichr
Externí odkaz:
http://arxiv.org/abs/2003.11610
Publikováno v:
Phys. Rev. Lett. 126, 017401 (2021)
The quest to realise strongly interacting photons remains an outstanding challenge both for fundamental science and for applications. Here, we explore mediated photon-photon interactions in a highly imbalanced two-component mixture of exciton-polarit
Externí odkaz:
http://arxiv.org/abs/2003.04659
Publikováno v:
Phys. Rev. Lett. 125, 035301 (2020)
We develop a theory for the interaction of light with superfluid optical media, describing the motion of quantum impurities that are created and dragged through the liquid by propagating photons. It is well known that a mobile impurity suffers dissip
Externí odkaz:
http://arxiv.org/abs/2002.01435