575 citations · 2.7k across the 54 of their papers we have counts for
39 papers · 1 filter
Effects of Coupling Between Chiral Vibrations and Spins in Molecular Magnets
Aman Ullah, Sergey A. Varganov, Yafis Barlas
In single molecular magnets, chiral vibrations carrying vibrational angular momentum () emerge due to the splitting of a doubly degenerate vibrational mode. H…
Quarter Metal Superconductivity
Chiho Yoon, Tianyi Xu, Yafis Barlas +1
We investigate the recently discovered multiple superconducting states in rhombohedral graphene quarter metal. We demonstrate that one of these states features a single-spin, singl…
Effect of Inversion Asymmetry on Bilayer Graphene's Superconducting and Exciton Condensates
Xiang Hu, Enrico Rossi, Yafis Barlas
Inversion asymmetry in bilayer graphene can be tuned by the displacement field. As a result, the band dispersion in biased bilayer graphene acquires flat band regions near the Dira…
Hofstadter-Moiré Butterfly in Twisted Trilayer Graphene
Muhammad Imran, Paul M. Haney, Yafis Barlas
Mirror symmetric twisted trilayer graphene (tTLG) is composed of even parity twisted bilayer graphene (tBLG)-like bands and odd parity Dirac-like bands. Here, we study the mirror-s…
Tuning Spin Transport in a Graphene Antiferromagnetic Insulator
Petr Stepanov, Dmitry L. Shcherbakov, Shi Che +7
Long-distance spin transport through anti-ferromagnetic insulators (AFMIs) is a long-standing goal of spintronics research. Unlike conventional spintronics systems, monolayer graph…
Topological braiding of non-Abelian mid-gap defects in classical meta-materials
Yafis Barlas, Emil Prodan
Non-trivial braid-group representations appear as non-Abelian quantum statistics of emergent Majorana zero modes in one and two-dimensional topological superconductors. Here, we ge…
Quantum Parity Hall effect in ABA Graphene
Petr Stepanov, Yafis Barlas, Shi Che +10
The celebrated phenomenon of quantum Hall effect has recently been generalized from transport of conserved charges to that of other approximately conserved state variables, includi…
Valley-Chern Effect with LC-Resonators: A Modular Platform
Yishai Eisenberg, Yafis Barlas, Emil Prodan
The valley Chern-effect is theoretically demonstrated with a novel alternating current circuitry, where closed-loop LC-resonators sitting at the nodes of a honeycomb lattice are in…
Spin superfluid Josephson oscillator
Yizhou Liu, Igor Barsukov, Ilya Krivorotov +2
The magnetic analogue of the Josephson effect can be exploited to develop a new class of nano-spin oscillators that we denote as spin superfluid Josephson oscillators. Such a devic…
Topological Classification Table Implemented with Classical Passive Meta-Materials
Yafis Barlas, Emil Prodan
Topological condensed matter systems from class A and class AII of the classification table have received classical electromagnetic and mechanical analogs and protected wave-guidin…
Theory and Experimental Investigation of the Quantum Valley Hall Effect
Kai Qian, David J. Apigo, Camelia Prodan +2
The quantum valley Hall effect (QVHE) has been observed in a variety of experimental setups, both quantum and classical. While extremely promising for applications, one should be r…
Twist Angle-Dependent Bands and Valley Inversion in 2D Materials/hBN Heterostructures
Shi Che, Petr Stepanov, Supeng Ge +13
The use of relative twist angle between adjacent atomic layers in a van der Waals heterostructure, has emerged as a new degree of freedom to tune electronic and optoelectronic prop…
Gate controlled Majorana Zero Modes on 2D heterostructures
Nima Djavid, Gen Yin, Yafis Barlas +1
Half-integer conductance, the signature of Majorana edge modes, has been recently observed in a quantum anomalous Hall insulator/superconductor heterostructure. Here, we analyze a…
Tunable Lifshitz Transitions and Multiband Transport in Tetralayer Graphene
Yanmeng Shi, Shi Che, Kuan Zhou +8
As the Fermi level and band structure of two-dimensional materials are readily tunable, they constitute an ideal platform for exploring Lifshitz transition, a change in the topolog…
Long-Distance Spin Transport Through a Graphene Quantum Hall Antiferromagnet
Petr Stepanov, Shi Che, Dmitry Shcherbakov +11
Antiferromagnetic insulators (AFMI) are robust against stray fields, and their intrinsic dynamics could enable ultrafast magneto-optics and ultrascaled magnetic information process…
Counter-propagating Fractional Hall states in mirror-symmetric Dirac semi-metals
Yafis Barlas
The Landau bands of mirror symmetric 2D Dirac semi-metals (for example odd-layers of ABA-graphene) can be identified by their parity with respect to mirror symmetry. This symmetry…
Exciton condensate in bilayer transition metal dichalcogenides: strong coupling regime
Bishwajit Debnath, Yafis Barlas, Darshana Wickramaratne +2
Exciton condensation in an electron-hole bilayer system of monolayer transition metal dichalcogenides is analyzed at three different levels of theory to account for screening and q…
Tunable symmetries of integer and fractional quantum Hall phases in heterostructures with multiple Dirac bands
Petr Stepanov, Yafis Barlas, Tim Espiritu +5
The co-presence of multiple Dirac bands in few-layer graphene leads to a rich phase diagram in the quantum Hall regime. Using transport measurements, we map the phase diagram of BN…
Spin Josephson effects in Exchange coupled Anti-ferromagnets
Yizhou Liu, Gen Yin, Jiadong Zang +2
The energy of exchange coupled antiferromagnetic insulators (AFMIs) is a periodic function of the relative in-plane orientation of the Néel vector fields. We show that this leads t…
Topological Spin Hall Effect due to Magnetic Skyrmions
Gen Yin, Yizhou Liu, Yafis Barlas +2
The intrinsic spin Hall effect (SHE) originates from the topology of the Bloch bands in momentum space. The duality between real space and momentum space calls for a spin Hall effe…
Proximity-induced ferromagnetism in graphene revealed by anomalous Hall effect
Zhiyong Wang, Chi Tang, Raymond Sachs +2
We demonstrate the anomalous Hall effect (AHE) in single-layer graphene exchange-coupled to an atomically flat yttrium iron garnet (YIG) ferromagnetic thin film. The anomalous Hall…
Gate Tunable Quantum Oscillations in Air-Stable and High Mobility Few-Layer Phosphorene Heterostructures
Nathaniel Gillgren, Darshana Wickramaratne, Yanmeng Shi +12
As the only non-carbon elemental layered allotrope, few-layer black phosphorus or phosphorene has emerged as a novel two-dimensional (2D) semiconductor with both high bulk mobility…
Quasiparticle renormalization in ABC graphene trilayers
Xu Dou, Akbar Jaefari, Yafis Barlas +1
We investigate the effect of electron-electron interactions in ABC stacked graphene trilayers. In the gapless regime, we show that the self-energy corrections lead to the renormali…
Multicomponent Quantum Hall Ferromagnetism and Landau Level Crossing in Rhombohedral Trilayer Graphene
Y. Lee, D. Tran, K. Myhro +6
Using transport measurements, we investigate multicomponent quantum Hall (QH) ferromagnetism in dual-gated rhombohedral trilayer graphene (r-TLG), in which the real spin, orbital p…