Zobrazeno 1 - 10
of 147
pro vyhledávání: '"Janssen, Lukas"'
Autor:
Francini, Niccolò, Janssen, Lukas
The candidate Kitaev magnet Na$_2$Co$_2$TeO$_6$ exhibits a characteristic ferrimagnetic response at low temperatures, with a finite residual magnetization that changes sign at a compensation point located at around half the ordering temperature. We a
Externí odkaz:
http://arxiv.org/abs/2409.12234
Pyrochlore magnets have proven to provide an excellent arena for the realization of a variety of many-body phenomena such as classical and quantum order-by-disorder, as well as spin liquid phases described by emergent gauge field theories. These phen
Externí odkaz:
http://arxiv.org/abs/2409.03825
Publikováno v:
Phys. Rev. B 110, 125123 (2024)
We characterize, by means of large-scale fermion quantum Monte Carlo simulations, metallic and deconfined quantum phase transitions in a bilayer honeycomb model in terms of their quantum critical and finite-temperature properties.The model features t
Externí odkaz:
http://arxiv.org/abs/2406.17042
The understanding of phenomena falling outside the Ginzburg-Landau paradigm of phase transitions represents a key challenge in condensed matter physics. A famous class of examples is constituted by the putative deconfined quantum critical points betw
Externí odkaz:
http://arxiv.org/abs/2312.11614
Autor:
Francini, Niccolò, Janssen, Lukas
Publikováno v:
Phys. Rev. B 109, 075104 (2024)
The honeycomb magnet Na$_2$Co$_2$TeO$_6$ has recently been argued to realize an approximate hidden SU(2) symmetry that can be understood by means of a duality transformation. Using large-scale classical Monte Carlo simulations, we study the finite-te
Externí odkaz:
http://arxiv.org/abs/2311.08475
Autor:
Song, Menghan, Zhao, Jiarui, Cheng, Meng, Xu, Cenke, Scherer, Michael M., Janssen, Lukas, Meng, Zi Yang
Over the past two decades, the enigma of the deconfined quantum critical point (DQCP) has attracted broad attention across the condensed matter, quantum field theory, and high-energy physics communities, as it is expected to offer a new paradigm in t
Externí odkaz:
http://arxiv.org/abs/2307.02547
Autor:
Hong, Xiaochen, Gillig, Matthias, Yao, Weiliang, Janssen, Lukas, Kocsis, Vilmos, Gass, Sebastian, Li, Yuan, Wolter, Anja U. B., Büchner, Bernd, Hess, Christian
Publikováno v:
npj Quantum Mater. 9, 18 (2024)
The recent report of a half-quantized thermal Hall effect in the Kitaev material $\alpha$-RuCl$_3$ has sparked a strong debate on whether it is generated by Majorana fermion edge currents or whether other more conventional mechanisms involving magnon
Externí odkaz:
http://arxiv.org/abs/2306.16963
Autor:
Moser, David Jonas, Janssen, Lukas
Publikováno v:
Phys. Rev. B 109, L081111 (2024)
We identify an exotic quasiuniversal behavior near the all-in-all-out Weyl quantum critical point in three-dimensional Luttinger semimetals, such as the pyrochlore iridates $R_2$Ir$_2$O$_7$, with $R$ a rare-earth element. The quasiuniversal behavior
Externí odkaz:
http://arxiv.org/abs/2305.07694
Publikováno v:
Phys. Rev. B 108, L100405 (2023)
Metallic quantum criticality is frequently discussed as a source for non-Fermi liquid behavior, but controlled theoretical treatments are scarce. Here we identify and study a novel magnetic quantum critical point in a two-dimensional antiferromagnet
Externí odkaz:
http://arxiv.org/abs/2212.11283
Publikováno v:
Phys. Rev. Lett. 131, 146702 (2023)
In extended Heisenberg-Kitaev-Gamma-type spin models, hidden-SU(2)-symmetric points are isolated points in parameter space that can be mapped to pure Heisenberg models via nontrivial duality transformations. Such points generically feature quantum de
Externí odkaz:
http://arxiv.org/abs/2211.16957