Zobrazeno 1 - 10
of 2 626
pro vyhledávání: '"Knolle P"'
Autor:
Leeb, Valentin, Knolle, Johannes
Quantum oscillation (QOs) measurements constitute one of the most powerful methods for determining the Fermi surface (FS) of metals, exploiting the famous Onsager relation between the FS area and the QO frequency. The recent observation of non-Onsage
Externí odkaz:
http://arxiv.org/abs/2408.00115
Autor:
Sim, GiBaik, Knolle, Johannes
Metallic altermagnets are unusual collinear magnets that feature zero net magnetization with momentum-dependent spin splitting. Here, we show that this spin splitting can induce pair density wave states even in the absence of external magnetic fields
Externí odkaz:
http://arxiv.org/abs/2407.01513
Deconfined quantum critical points (DQCPs) are putative phase transitions beyond the Landau paradigm with emergent fractionalized degrees of freedom. The original example of a DQCP is the spin-1/2 quantum antiferromagnet on the square lattice which f
Externí odkaz:
http://arxiv.org/abs/2406.12729
Autor:
Körber, Jonathan, Heiler, Jonah, Fuchs, Philipp, Flad, Philipp, Hesselmeier, Erik, Kuna, Pierre, Ul-Hassan, Jawad, Knolle, Wolfgang, Becher, Christoph, Kaiser, Florian, Wrachtrup, Jörg
Solid state quantum emitters are a prime candidate in distributed quantum technologies since they inherently provide a spin-photon interface. An ongoing challenge in the field, however, is the low photon extraction due to the high refractive index of
Externí odkaz:
http://arxiv.org/abs/2406.08208
We apply the topological theory of symmetry indicators to interaction-induced exciton band structures in centrosymmetric semiconductors. Crucially, we distinguish between the topological invariants inherited from the underlying electron and hole band
Externí odkaz:
http://arxiv.org/abs/2405.19394
We investigate a model of Dirac fermions with Haldane type mass impurities which open a global topological gap even in the dilute limit. Surprisingly, we find that the chirality of this mass term, i.e., the sign of the Chern number, can be reversed b
Externí odkaz:
http://arxiv.org/abs/2405.19289
Autor:
Moon, Leo Joon Il, Schindler, Paul Manuel, Sun, Yizhe, Druga, Emanuel, Knolle, Johannes, Moessner, Roderich, Zhao, Hongzheng, Bukov, Marin, Ajoy, Ashok
Our understanding of phases of matter relies on symmetry breaking, one example being water ice whose crystalline structure breaks the continuous translation symmetry of space. Recently, breaking of time translation symmetry was observed in systems no
Externí odkaz:
http://arxiv.org/abs/2404.05620
Autor:
Jin, Hui-Ke, Knolle, Johannes
Frustrated magnets can have accidental ground state degeneracies which may be lifted by various forms of disorder, for example in the form of thermal or quantum fluctuations. This order by disorder (ObD) paradigm is well established in equilibrium an
Externí odkaz:
http://arxiv.org/abs/2403.17118
Autor:
Blinder, Rémi, Mindarava, Yuliya, Korzeczek, Martin, Marshall, Alastair, Glöckler, Felix, Nothelfer, Steffen, Kienle, Alwin, Laube, Christian, Knolle, Wolfgang, Jentgens, Christian, Plenio, Martin B., Jelezko, Fedor
Nuclear hyperpolarization is a known method to enhance the signal in nuclear magnetic resonance (NMR) by orders of magnitude. The present work addresses the $^{13}$C hyperpolarization in diamond micro- and nanoparticles, using the optically-pumped ni
Externí odkaz:
http://arxiv.org/abs/2403.14521
Publikováno v:
Physical Review B 110, 024425 (2024)
We study two-dimensional $d$-wave altermagnetic metals taking into account the presence of substrate-induced Rashba spin-orbit coupling. We consider the altermagnet bandstructure using a 2D band Hamiltonian near the $\Gamma$ point under external magn
Externí odkaz:
http://arxiv.org/abs/2403.10509