Zobrazeno 1 - 10
of 118
pro vyhledávání: '"Johannes Knolle"'
Publikováno v:
npj Quantum Materials, Vol 9, Iss 1, Pp 1-9 (2024)
Abstract We study the effect of hole doping on the Kitaev spin liquid (KSL) and find that for ferromagnetic (FM) Kitaev exchange K the system is very susceptible to the formation of a FM spin polarization. Through density matrix renormalization group
Externí odkaz:
https://doaj.org/article/30feb2774e7d430ab51652723c8a3a44
Publikováno v:
Nature Communications, Vol 15, Iss 1, Pp 1-12 (2024)
Abstract Quantum fluctuations can inhibit long-range ordering in frustrated magnets and potentially lead to quantum spin liquid (QSL) phases. A prime example are gapless QSLs with emergent U(1) gauge fields, which have been understood to be described
Externí odkaz:
https://doaj.org/article/5fac4f9db6ca4856b620d5c5a0293941
Publikováno v:
npj Quantum Materials, Vol 9, Iss 1, Pp 1-14 (2024)
Abstract The dynamical response of a quantum spin liquid upon injecting a hole is a pertinent open question. In experiments, the hole spectral function, measured momentum-resolved in angle-resolved photoemission spectroscopy (ARPES) or locally in sca
Externí odkaz:
https://doaj.org/article/3d5f8b37bd954602891ed585769d288a
Publikováno v:
Physical Review Research, Vol 6, Iss 1, p 013032 (2024)
The Fermi-Hubbard model is one of the central paradigms in the physics of strongly correlated quantum many-body systems. Here we propose a quantum circuit algorithm based on the Z_{2} lattice gauge theory (LGT) representation of the one-dimensional F
Externí odkaz:
https://doaj.org/article/413292e8d3c24255a3bfa5bc057e3346
Autor:
Lukas Powalla, Jonas Kiemle, Elio J. König, Andreas P. Schnyder, Johannes Knolle, Klaus Kern, Alexander Holleitner, Christoph Kastl, Marko Burghard
Publikováno v:
Nature Communications, Vol 13, Iss 1, Pp 1-8 (2022)
Spin-based electronics offers significantly improved efficiency, but a major challenge is the electric manipulation of spin. Here, Powalla et al find a large gate induced spinpolarization in graphene/WTe2 heterostructures, illustrating the potential
Externí odkaz:
https://doaj.org/article/8d3c21d8feb3436b8eebbec8befa9d33
Autor:
Chris N. Self, Kiran E. Khosla, Alistair W. R. Smith, Frédéric Sauvage, Peter D. Haynes, Johannes Knolle, Florian Mintert, M. S. Kim
Publikováno v:
npj Quantum Information, Vol 7, Iss 1, Pp 1-7 (2021)
Abstract We introduce an optimisation method for variational quantum algorithms and experimentally demonstrate a 100-fold improvement in efficiency compared to naive implementations. The effectiveness of our approach is shown by obtaining multi-dimen
Externí odkaz:
https://doaj.org/article/df508c9fc03941c3b4af813f7440ce5c
Autor:
Joseph Vovrosh, Johannes Knolle
Publikováno v:
Scientific Reports, Vol 11, Iss 1, Pp 1-8 (2021)
Abstract Confinement describes the phenomenon when the attraction between two particles grows with their distance, most prominently found in quantum chromodynamics (QCD) between quarks. In condensed matter physics, confinement can appear in quantum s
Externí odkaz:
https://doaj.org/article/4cd603f8fa2e4e1fba62bbc800274609
Publikováno v:
Nature Communications, Vol 12, Iss 1, Pp 1-7 (2021)
Discrete time crystals are typically characterized by a period doubled response with respect to an external drive. Here, the authors predict the emergence of rich dynamical phases with higher-order and fractional periods in clean spin-1/2 chains with
Externí odkaz:
https://doaj.org/article/0bf75c777be34ecbb890e3ed42897c04
Publikováno v:
Nature Communications, Vol 12, Iss 1, Pp 1-8 (2021)
A model of a classical discrete time crystal satisfying the criteria of persistent subharmonic response robust against thermal noise and defects has been lacking. Here, the authors show that these criteria are satisfied in one-dimensional probabilist
Externí odkaz:
https://doaj.org/article/258f88048f7e4a2eb0f3eacf24933382
Publikováno v:
PRX Quantum, Vol 3, Iss 4, p 040309 (2022)
The study of confinement in quantum spin chains has seen a large surge of interest in recent years. It is not only important for understanding a range of effective one-dimensional condensed-matter realizations but it also shares some of the nonpertur
Externí odkaz:
https://doaj.org/article/e70caf9307a743ec91559a5049a8e739