88 citations · 473 across the 22 of their papers we have counts for
22 papers
Quantized Conductance through Surface States in High Quality Three-Dimensional Dirac Semimetal CdAs Nanowire/Nanoribbon p-n Junctions
Sungjin An, Zhuo Bin Siu, Vardan Kaladzhyan +8
We report the observation of quantized conductance in high-mobility three-dimensional Dirac semimetal CdAs nanowire and nanoribbon p-n junctions. By employing suspended dev…
RKKY interaction at helical edges of topological superconductors
Katharina Laubscher, Dmitry Miserev, Vardan Kaladzhyan +2
We study spin configurations of classical magnetic impurities placed close to the edge of a two-dimensional topological superconductor both analytically and numerically. First, we…
Quasiparticle interference patterns in bilayer graphene with trigonal warping
Vardan Kaladzhyan, Frédéric Joucken, Zhehao Ge +5
We calculate the form of quasiparticle interference patterns in bilayer graphene within a low-energy description, taking into account perturbatively the trigonal warping terms. We…
Surface states and quasiparticle interference in Bernal and rhombohedral graphite with and without trigonal warping
Vardan Kaladzhyan, Sarah Pinon, Frédéric Joucken +6
We use an exact analytical technique [Phys. Rev. B \textbf{101}, 115405 (2020), Phys. Rev. B \textbf{102}, 165117 (2020)] to recover the surface Green's functions for Bernal (ABA)…
Direct Visualization of Native Defects in Graphite and Their Effect on the Electronic Properties of Bernal-Stacked Bilayer Graphene
Frederic Joucken, Cristina Bena, Zhehao Ge +7
Graphite crystals used to prepare graphene-based heterostructures are generally assumed to be defect free. We report here scanning tunneling microscopy results that show graphite c…
Analytical and semianalytical tools to determine the topological character of Shiba chains
Nicholas Sedlmayr, Vardan Kaladzhyan, Cristina Bena
We introduce three new analytical and semi-analytical tools that allow one to determine the topological character of impurity Shiba chains. The analytical methods are based on calc…
Surface Green's functions and quasiparticle interference in Weyl semimetals
Sarah Pinon, Vardan Kaladzhyan, Cristina Bena
We use the exact analytical technique introduced in Phys. Rev. B 101, 115405 to recover the surface Green's functions and the corresponding Fermi-arc surface states for various lat…
Exact lattice-model calculation of boundary modes for Weyl semimetals and graphene
Vardan Kaladzhyan, Sarah Pinon, Jens H. Bardarson +1
We provide an exact analytical technique to obtain within a lattice model the wave functions of the edge states in zigzag- and bearded-edge graphene, as well as of the Fermi-arc su…
Modeling long imperfect SNS junctions and Andreev bound states using two impurities and the T -matrix formalism
Sarah Pinon, Vardan Kaladzhyan, Cristina Bena
We provide a new analytical tool to calculate the energies of Andreev bound states (ABS) in long imperfect SNS junctions, at present these can only be described by numerical tools.…
Surface Green's functions and boundary modes using impurities: Weyl semimetals and topological insulators
Sarah Pinon, Vardan Kaladzhyan, Cristina Bena
In this work we provide a new direct and non-numerical technique to obtain the surface Green's functions for three-dimensional systems. This technique is based on the ideas present…
Quantized Fermi-arc-mediated transport in Weyl semimetal nanowires
Vardan Kaladzhyan, Jens H. Bardarson
We study longitudinal transport in Weyl semimetal nanowires, both in the absence and in the presence of a magnetic flux threading the nanowires. We identify two qualitatively diffe…
RKKY interaction on the surface of three-dimensional Dirac semimetals
V. Kaladzhyan, A. A. Zyuzin, P. Simon
We study the RKKY interaction between two magnetic impurities located on the surface of a three-dimensional Dirac semimetal with two Dirac nodes in the band structure. By taking in…
Majorana fermions in finite-size strips in the presence of orbital effects: what is the Majorana polarization telling us?
Selma Franca, Vardan Kaladzhyan, Cristina Bena
We study numerically the formation of Majorana bound states in a finite-size quasi-one-dimensional square-lattice strip with Rashba spin-orbit coupling, in the presence of a proxim…
Topology from Triviality
Vardan Kaladzhyan, Cristina Bena, Pascal Simon
We show that bringing into proximity two topologically trivial systems can give rise to a topological phase. More specifically, we study a 1D metallic nanowire proximitized by a 2D…
On the bulk boundary correspondence and the existence of Majorana bound states on the edges of 2D topological superconductors
Nicholas Sedlmayr, Vardan Kaladzhyan, Clément Dutreix +1
The bulk-boundary correspondence establishes a connection between the bulk topological index of an insulator or superconductor, and the number of topologically protected edge bands…
Controlling topological superconductivity by magnetization dynamics
Vardan Kaladzhyan, Pascal Simon, Mircea Trif
We study theoretically a chain of precessing classical magnetic impurities in an -wave superconductor. Utilizing a rotating wave description, we derive an effective Hamiltonian…
Formation of Majorana fermions in finite-size graphene strips
Vardan Kaladzhyan, Cristina Bena
We investigate the formation of Majorana fermions in finite-size graphene strips with open boundary conditions in both directions, in the presence of an in-plane magnetic field and…
Majorana fermions in finite-size strips with in-plane magnetic fields
Vardan Kaladzhyan, Julien Despres, Ipsita Mandal +1
We study the Majorana bound states arising in quasi-one-dimensional systems with Rashba spin-orbit coupling in the presence of an in-plane Zeeman magnetic field. Using two differen…
Topological state engineering by potential impurities on chiral superconductors
Vardan Kaladzhyan, Joel Röntynen, Pascal Simon +1
In this work we consider the influence of potential impurities deposited on top of two-dimensional chiral superconductors. As discovered recently, magnetic impurity lattices on an…
Characterizing unconventional superconductors from the spin structure of impurity-induced bound states
Vardan Kaladzhyan, Cristina Bena, Pascal Simon
Cooper pairs in two-dimensional unconventional superconductors with broken inversion symmetry are in a mixture of an even-parity spin-singlet pairing state with an odd-parity spin-…
Photogalvanic effect in HgTe/CdTe topological insulator due to edge-bulk optical transitions
Vardan O. Kaladzhyan, Pavel P. Aseev, Sergey N. Artemenko
We study theoretically 2D HgTe/CdTe quantum well topological insulator (TI) illuminated by circularly polarized light with frequencies higher than the difference between the equili…
Photogalvanic effects in topological insulators
S. N. Artemenko, V. O. Kaladzhyan
We discuss optical absorption in topological insulators and study possible photoelectric effects theoretically. We found that absorption of circularly polarized electromagnetic wav…