Tootfinder

Integer and fractional quantum anomalous Hall effects in pentalayer graphene
Ming Xie, Sankar Das Sarma
https://arxiv.org/abs/2404.02192 https://

Integer and fractional quantum anomalous Hall effects in pentalayer graphene
We critically analyze the recently reported observation of integer (IQAHE) and fractional (FQAHE) quantum anomalous Hall effects at zero applied magnetic field in pentalayer graphene. Our quantitative activation and variable range hopping transport analysis of the experimental data reveals that the observed IQAHE and FQAHE at different fillings all have similar excitation gaps of the order of $5-10$ K. In addition, we also find that the observed FQAHE manifests a large hidden background contact…

Gonna try to take some sleep meds and hopefully get to sleep. Maybe I'll wake up tomorrow feeling like my life isn't pointless....😔

Hindi na kagulat-gulat na hindi sinama ni BBM ang Pebrero 25 sa listahan ng mga opisyal na araw na walang pasok. Pero hindi ibig sabihin na kakalimutan ko na kung bakit pinatalsik ng taumbayan ang diktador niyang ama.
#NeverForget #NeverAgain

Und dann haben wir hier natürlich noch den #Pilatus. Unten rechts der Weiler Hinteralbis, da gibt‘s separat etwas zu erzählen. Irgendwann kommt man dann nach Hausen a.A., wo Land und Landaktivitäten am Dorfplatz auf eher mondäne Probleme stossen, die man heute halt gerne als „#Dichtestress“ benennt, obwo…

I gave #Threads a go for a few weeks, and my feeling is that it's almost totally pointless actually posting anything - unless you're one of The Algorithm's Chosen Few, in which case it's probably a lot like being Twitter-famous.
Anyone had any experiences that contradict that impression?

Topology Change from Pointlike Sources
Yasha Neiman, David O'Connell
https://arxiv.org/abs/2403.04281 https://arxiv.org/pdf/2403.…

Topology Change from Pointlike Sources
In this paper we study topology-changing spacetimes occurring from pointlike sources. Following an old idea of Penrose, we will opt for a non-Hausdorff model of topology change in which an initial pointlike source is "doubled" and allowed to propagate along null rays into an eventual cobordism. By appealing to recent developments in non-Hausdorff differential geometry, we will describe and evaluate gravitational actions on these pointlike topology-changing spacetimes. Motivated by analogous res…

Flat-band ratio and quantum metric in the superconductivity of modified Lieb lattices
Reko P. S. Penttil\"a, Kukka-Emilia Huhtinen, P\"aivi T\"orm\"a
https://arxiv.org/abs/2404.12993

Flat-band ratio and quantum metric in the superconductivity of modified Lieb lattices
Flat bands may offer a route to high critical temperatures of superconductivity. It has been predicted that the quantum geometry of the band as well as the ratio of the number of flat bands to the number of orbitals determine flat band superconductivity. However, such results have assumed at least one of the following: an isolated flat band, zero temperature, mean-field theory, and/or uniform pairing. Here, we explore flat band superconductivity when these assumptions are relaxed. We consider a…

Flat-band ratio and quantum metric in the superconductivity of modified Lieb lattices
Reko P. S. Penttil\"a, Kukka-Emilia Huhtinen, P\"aivi T\"orm\"a
https://arxiv.org/abs/2404.12993

Flat-band ratio and quantum metric in the superconductivity of modified Lieb lattices
Flat bands may offer a route to high critical temperatures of superconductivity. It has been predicted that the quantum geometry of the band as well as the ratio of the number of flat bands to the number of orbitals determine flat band superconductivity. However, such results have assumed at least one of the following: an isolated flat band, zero temperature, mean-field theory, and/or uniform pairing. Here, we explore flat band superconductivity when these assumptions are relaxed. We consider a…

Ultrafast Band Structure Dynamics in Bulk 1$T$-VSe$_2$
Wibke Bronsch, Manuel Tuniz, Denny Puntel, Alessandro Giammarino, Fulvio Parmigiani, Yang-Hao Chan, Federico Cilento
https://arxiv.org/abs/2403.03805

Ultrafast Band Structure Dynamics in Bulk 1$T$-VSe$_2$
Complex materials encompassing different phases of matter can display new photoinduced metastable states differing from those attainable under equilibrium conditions. These states can be realized when energy is injected in the material following a non-equilibrium pathway, unbalancing the unperturbed energy landscape of the material. Guided by the fact that photoemission experiments allow for detailed insights in the electronic band structure of ordered systems, here we study bulk 1$T$-VSe$_2$ i…