Zobrazeno 1 - 10
of 285
pro vyhledávání: '"Kruchkov, A."'
Autor:
Kruchkov, Alexander, Ryu, Shinsei
We revisit the connection between entanglement entropy and quantum metric in topological lattice systems, and provide an elegant and concise proof of this connection. In gapped two-dimensional lattice models with well-defined tight-binding Hamiltonia
Externí odkaz:
http://arxiv.org/abs/2408.10314
Autor:
Anderson, Laurel E., Laitinen, Antti, Zimmerman, Andrew, Werkmeister, Thomas, Shackleton, Henry, Kruchkov, Alexander, Taniguchi, Takashi, Watanabe, Kenji, Sachdev, Subir, Kim, Philip
Publikováno v:
Physical Review Letters 132, 246502 (2024)
Disorder at the etched edges of graphene quantum dots (GQD) enables random all-to-all interactions between localized charges in partially-filled Landau levels, providing a potential platform to realize the Sachdev-Ye-Kitaev (SYK) model. We use quantu
Externí odkaz:
http://arxiv.org/abs/2401.08050
Autor:
Kruchkov, Alexander, Ryu, Shinsei
Topological invariants are fundamental characteristics reflecting global properties of quantum systems, yet their exploration has predominantly been limited to the static (DC) transport and transverse (Hall) channel. In this work, we extend the spect
Externí odkaz:
http://arxiv.org/abs/2312.17318
Autor:
Kruchkov, Alexander, Ryu, Shinsei
We uncover a useful connection between the integrated current noise $S(\omega)$ and the topological band gap in dispersionless quantum states, $\int d \omega [ \mathcal S^{\text{flat}}_{xx} + \mathcal S^{\text{flat}}_{yy} ] = C e^2 \Delta^2$ (in unit
Externí odkaz:
http://arxiv.org/abs/2309.00042
We investigate superfluidity of bosons in gapped topological bands and discover a new phase that has no counterparts in the previous literature. This phase is characterized by a highly unconventional modulation of the order parameter, breaking the cr
Externí odkaz:
http://arxiv.org/abs/2307.08748
Autor:
Kruchkov, Alexander
We consider a non-Hermitian yet $\mathcal{PT}$-symmetric Fermi liquid ($\mathcal{PT}$-FL) in external electric fields. Due to $\mathcal{PT}$-symmetry, the system exhibits real spectrum, Fermi surface and electric conductivity are well-defined through
Externí odkaz:
http://arxiv.org/abs/2305.17450
Autor:
Kruchkov, Alexander
Flat electronic bands are counterintuitive: with the electron velocity vanishing, our conventional notions of quasiparticle transport are no longer valid. We here study the quantum transport in the generalized families of perfectly flat bands [PRB 10
Externí odkaz:
http://arxiv.org/abs/2210.00351
Publikováno v:
Physical Review Letters 131, 036503 (2023)
We model SYK (Sachdev-Ye-Kitaev) interactions in disordered graphene flakes up to 300 000 atoms ($\sim$100 nm in diameter) subjected to an out-of-plane magnetic field $B$ of 5-20 Tesla within the tight-binding formalism. We investigate two sources of
Externí odkaz:
http://arxiv.org/abs/2208.01032
Publikováno v:
Physical Review B (Letter), 106, L121115 (2022)
In this work we address the re-entrance of magic-angle phenomena (band flatness and quantum-geometric transport) in twisted bilayer graphene (TBG) subjected to strong magnetic fluxes $\pm \Phi_0$, $\pm 2 \Phi_0$, $\pm 3 \Phi_0$... ($\Phi_0 = h/e$ is
Externí odkaz:
http://arxiv.org/abs/2201.13062
The interplay of topological characteristics in real space and reciprocal space can lead to the emergence of unconventional topological phases. In this Letter, we implement a novel mechanism for generating higher-Chern flat bands on the basis of twis
Externí odkaz:
http://arxiv.org/abs/2111.10410