870 citations · 2.5k across the 23 of their papers we have counts for
12 papers · 1 filter
Noise probing of topological band gaps in dispersionless quantum states
Alexander Kruchkov, Shinsei Ryu
We uncover a useful connection between the integrated current noise and the topological band gap in dispersionless quantum states, $\int d ω[ \mathcal S^{\text{flat}}_{xx} +…
Anomalous conductivity of -symmetric Fermi liquids
Alexander Kruchkov
We consider a non-Hermitian yet -symmetric Fermi liquid (-FL) in external electric fields. Due to -symmetry, the system exhibits real spec…
Quantum transport in dispersionless electronic bands
Alexander Kruchkov
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are counterintuitive: with the electron velocity vanishing, our conventional notions of quasiparticle transport are no longer valid.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…
Engineering SYK interactions in disordered graphene flakes under realistic experimental conditions
Marta Brzezinska, Yifei Guan, Oleg V. Yazyev +2
We model SYK (Sachdev-Ye-Kitaev) interactions in disordered graphene flakes up to 300 000 atoms (100 nm in diameter) subjected to an out-of-plane magnetic field of 5-20 T…
Unconventional Flat Chern Bands and 2 Charges in Skyrmionic Moiré Superlattices
Yifei Guan, Oleg V. Yazyev, Alexander Kruchkov
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…
Origin of band flatness and constraints of higher Chern numbers
Alexander Kruchkov
Flat bands provide a natural platform for emergent electronic states beyond Landau paradigm. Among those of particular importance are flat Chern bands, including bands of higher Ch…
Magic Angle Hierarchy in Twisted Graphene Multilayers
Eslam Khalaf, Alex J. Kruchkov, Grigory Tarnopolsky +1
When two monolayers of graphene are stacked with a small relative twist angle, the resulting band structure exhibits a remarkably flat pair of bands at a sequence of 'magic angles'…
Origin of Magic Angles in Twisted Bilayer Graphene
Grigory Tarnopolsky, Alex J. Kruchkov, Ashvin Vishwanath
Twisted Bilayer graphene (TBG) is known to feature isolated and relatively flat bands near charge neutrality, when tuned to special magic angles. However, different criteria for th…
Electric field-driven topological phase switching and skyrmion lattice metastability in magnetoelectric CuOSeO
J. S. White, I. Živković, A. J. Kruchkov +3
Due to their topological protection and nanometric size, magnetic skyrmions are anticipated to form components of new high-density memory technologies. In metallic systems skyrmion…
In situ Electric Field Skyrmion Creation in Magnetoelectric CuOSeO
Ping Huang, Marco Cantoni, Alex Kruchkov +4
Magnetic skyrmions are localized nanometric spin textures with quantized winding numbers as the topological invariant. Rapidly increasing attention has been paid to the investigati…
Laser-Induced Skyrmion Writing and Erasing in an Ultrafast Cryo-Lorentz Transmission Electron Microscopy
G. Berruto, I. Madan, Y. Murooka +11
We demonstrate that light-induced heat pulses of different duration and energy can write skyrmions in a broad range of temperatures and magnetic field in FeGe. Using a combination…
Dramatic pressure-driven enhancement of bulk skyrmion stability
I. Levatić, P. Popčević, V. Šurija +6
The recent discovery of magnetic skyrmion lattices initiated a surge of interest in the scientific community. Several novel phenomena have been shown to emerge from the interaction…