151 citations · 642 across the 22 of their papers we have counts for
22 papers
Floquet-Multiple Andreev Reflections
Régis Mélin, Romain Danneau, Morteza Kayyalha
Floquet theory describes quantum systems governed by time-periodic Hamiltonians, much as Bloch theory describes spatially periodic solids. In voltage-biased multiterminal Josephson…
Hybridization of topologically distinct quartet modes in three-terminal graphene Josephson junctions
Asmaul Smitha Rashid, Le Yi, Takashi Taniguchi +4
Multiterminal Josephson junctions offer a powerful playground for exploring exotic superconducting and topological phenomena beyond the reach of conventional two-terminal devices.…
Building 3D superconductor-based Josephson junctions using a via transfer approach
Cequn Li, Le Yi, Kalana D. Halanayake +8
The coupling of superconductivity to unconventional materials may lead to novel quantum states and potential applications. Controlling the quality of the superconductor-normal meta…
Non-Hermitian Dynamics in Quantum Anomalous Hall Insulators
Le Yi, Emma Steinebronn, Asmaul Smitha Rashid +4
Magnetically doped topological insulators (TIs) exhibit two distinct phases: the quantum anomalous Hall (QAH) phase when the Fermi level resides within the surface gap, and a metal…
Revisiting the adiabatic limit in ballistic multiterminal Josephson junctions
Régis Mélin, Asmaul Smitha Rashid, Romain Danneau +1
Motivated by recent experiments on multiterminal Josephson junctions (MJJs) that probe different ranges of the size and bias voltage parameters, we explore the regime of increasing…
Nonequilibrium Andreev resonances in ballistic graphene Andreev interferometers
Asmaul Smitha Rashid, Le Yi, Takashi Taniguchi +4
We study nonequilibrium Andreev resonances in a voltage-biased graphene three-terminal Josephson junction (JJ). We observe periodic oscillations of resistance with maxima at multip…
Understanding Disorder in Monolayer Graphene Devices with Gate-Defined Superlattices
Vinay Kammarchedu, Derrick Butler, Asmaul Smitha Rashid +2
Engineering superlattices (SLs) - which are spatially periodic potential landscapes for electrons - is an emerging approach for the realization of exotic properties, including supe…
Ballistic Andreev interferometers
Régis Mélin, Asmaul Smitha Rashid, Morteza Kayyalha
A Josephson junction, formed between two phase-biased superconductors and a normal metal, hosts a discrete spectrum of Andreev bound states (ABS). In this paper, we develop a theor…
Magnetic-field-free nonreciprocal transport in graphene multi-terminal Josephson junctions
Fan Zhang, Asmaul Smitha Rashid, Mostafa Tanhayi Ahari +6
Nonreciprocal superconducting devices have attracted growing interest in recent years as they potentially enable directional charge transport for applications in superconducting qu…
Andreev processes in mesoscopic multi-terminal graphene Josephson junctions
Fan Zhang, Asmaul Smitha Rashid, Mostafa Tanhayi Ahari +7
There is growing interest in using multi-terminal Josephson junctions (MTJJs) as a platform to artificially emulate topological phases and to investigate complex superconducting me…
Integer quantum Hall effect and enhanced g-factor in quantum confined Cd3As2 films
Run Xiao, Junyi Zhang, Juan Chamorro +6
We investigate the integer quantum Hall effect in Cd3As2 thin films under conditions of strong to moderate quantum confinement (thicknesses of 10 nm, 12 nm, 15 nm). In all the film…
Confinement-Induced Chiral Edge Channel Interaction in Quantum Anomalous Hall Insulators
Ling-Jie Zhou, Ruobing Mei, Yi-Fan Zhao +8
In quantum anomalous Hall (QAH) insulators, the interior is insulating but electrons can travel with zero resistance along one-dimensional conducting paths known as chiral edge cha…
Aharonov-Bohm oscillations in bilayer graphene edge state Fabry-Pérot interferometers
Hailong Fu, Ke Huang, Kenji Watanabe +3
The charge and exchange statistics of an elementary excitation manifest in quantum coherent oscillations that can be explored in interferometry measurements. Quantum Hall interfero…
Electrical Switching of the Edge Current Chirality in Quantum Anomalous Hall Insulators
Wei Yuan, Ling-Jie Zhou, Kaijie Yang +9
A quantum anomalous Hall (QAH) insulator is a topological state of matter, in which the interior is insulating but electrical current flows along the edges of the sample, in either…
Mapping the phase diagram of the quantum anomalous Hall and topological Hall effects in a dual-gated magnetic topological insulator heterostructure
Run Xiao, Di Xiao, Jue Jiang +11
We use magnetotransport in dual-gated magnetic topological insulator heterostructures to map out a phase diagram of the topological Hall and quantum anomalous Hall effects as a fun…
Non-Majorana Origin of the Half-Quantized Conductance Plateau in Quantum Anomalous Hall Insulator and Superconductor Hybrid Structures
Morteza Kayyalha, Di Xiao, Ruoxi Zhang +14
A quantum anomalous Hall (QAH) insulator coupled to an s-wave superconductor is predicted to harbor a topological superconducting phase, the elementary excitations of which (i.e. M…
Concurrence of Quantum Anomalous Hall and Topological Hall Effects in Magnetic Topological Insulator Sandwich Heterostructures
Jue Jiang, Di Xiao, Fei Wang +13
The quantum anomalous Hall (QAH) effect is a quintessential consequence of non-zero Berry curvature in momentum-space. The QAH insulator harbors dissipation-free chiral edge states…
Highly skewed current-phase relation in superconductor-topological insulator-superconductor Josephson junctions
Morteza Kayyalha, Aleksandr Kazakov, Ireneusz Miotkowski +3
Three-dimensional topological insulators (TI's) in proximity with superconductors are expected to exhibit exotic phenomena such as topological superconductivity (TSC) and Majorana…
Anomalous low-temperature enhancement of supercurrent in topological-insulator nanoribbon Josephson junctions: evidence for low-energy Andreev bound states
Morteza Kayyalha, Mehdi Kargarian, Aleksandr Kazakov +5
We report anomalous enhancement of the critical current at low temperatures in gate-tunable Josephson junctions made from topological insulator BiSbTeSe nanoribbons with superc…
Gate-tunable supercurrent and multiple Andreev reflections in a superconductor-topological insulator nanoribbon-superconductor hybrid device
Luis A. Jauregui, Morteza Kayyalha, Aleksander Kazakov +3
We report on the observation of gate-tunable proximity-induced superconductivity and multiple Andreev reflections (MAR) in a bulk-insulating BiSbTeSe topological insulator nano…
Observation of reduced 1/f noise in Graphene field effect transistors on Boron Nitride substrates
Morteza Kayyalha, Yong P. Chen
We have investigated the low frequency (f) flicker (also called 1/f) noise of single-layer graphene devices on h-BN (placed on SiO2/Si) along with those on SiO2/Si. We observe that…
Gate-Tunable and Thickness-dependent Electronic and Thermoelectric Transport in few-layer MoS2
Morteza Kayyalha, Jesse Maassen, Mark Lundstrom +2
Over the past few years, there has been a growing interest in layered transition metal dichalcogenides (TMD) such as molybdenum disulfide (MoS2). Most studies so far have focused o…