110 citations · 1.6k across the 80 of their papers we have counts for
17 papers · 1 filter
Displacement field stabilizes even-denominator and partonic fractional quantum Hall states in the Landau levels of Bernal-stacked bilayer graphene
Rakesh K. Dora, Udit Khanna, Ajit C. Balram
Bernal-stacked bilayer graphene (BLG), in which a graphene layer is stacked atop another and laterally shifted by a lattice constant, offers remarkable tunability in its single-par…
Skyrmion Excitations in the Quantum Hall state in Monolayer Graphene
Jincheng An, Ajit C. Balram, Ganpathy Murthy
We investigate the skyrmion excited states atop the quantum Hall ferromagnetic ground state at filling factor in monolayer graphene. The competition among short-rang…
Hetero-Orbital Two-Component Fractional Quantum Hall States in Bilayer Graphene
Ke Huang, Ajit C. Balram, Hailong Fu +5
A two-dimensional electron system exposed to a strong magnetic field produces a plethora of strongly interacting fractional quantum Hall (FQH) states, the complex topological order…
Anomalous Transport Gaps of Fractional Quantum Hall Phases in Graphene Landau Levels are Induced by Spin-Valley Entangled Ground States
Jincheng An, Ajit C. Balram, Udit Khanna +1
We evaluate the transport gaps in the most prominent fractional quantum Hall states in the and Landau Levels of graphene, accounting for the Coulo…
Even-denominator fractional quantum Hall states in the zeroth Landau level of ABA trilayer graphene
Tanima Chanda, Simrandeep Kaur, Harsimran Singh +6
Even-denominator fractional quantum Hall states (FQHSs) at half filling are of particular interest because they can host non-Abelian quasiparticles. Here we report the emergence of…
Fractional quantum Hall coexistence phases in higher Landau levels of graphene
Jincheng An, Ajit C. Balram, Udit Khanna +1
Monolayer graphene under a strong magnetic field near charge neutrality manifests the integer and fractional quantum Hall effects. Since only some of the four spin/valley flavors a…
Magnetic and Lattice Ordered Fractional Quantum Hall Phases in Graphene
Jincheng An, Ajit C. Balram, Ganpathy Murthy
At and near charge neutrality, monolayer graphene in a perpendicular magnetic field is a quantum Hall ferromagnet. In addition to the highly symmetric Coulomb interaction, residual…
Fingerprints of Composite Fermion Lambda Levels in Scanning Tunneling Microscopy
Songyang Pu, Ajit C. Balram, Yuwen Hu +6
Composite fermion (CF) is a topological quasiparticle that emerges from a non-perturbative attachment of vortices to electrons in strongly correlated two-dimensional materials. Sim…
Competition between fractional quantum Hall liquid and electron solid phases in the Landau levels of multilayer graphene
Rakesh K. Dora, Ajit C. Balram
We study the competition between the electron liquid and solid phases, such as Wigner crystal and bubbles, in partially filled Landau levels (LLs) of multilayer graphene. Graphene…
Fractional quantum Hall effect in semiconductor systems
Zlatko Papić, Ajit C. Balram
The fractional quantum Hall (FQH) effect refers to the strongly-correlated phenomena and the associated quantum phases of matter realized in a two-dimensional gas of electrons plac…
Quench dynamics of collective modes in fractional quantum Hall bilayers
Zhao Liu, Ajit C. Balram, Zlatko Papić +1
We introduce different types of quenches to probe the non-equilibrium dynamics and multiple collective modes of bilayer fractional quantum Hall states. We show that applying an ele…
Charge and spin textures of Ising quantum Hall ferromagnet domain walls
Jeroen Danon, Ajit C. Balram, Samuel Sánchez +1
We investigate the charge and spin structures associated with arbitrary smooth polarization textures in Ising (integer) quantum Hall ferromagnets. We consider the case where the tw…
Current-induced gap opening in interacting topological insulator surfaces
Ajit C. Balram, Karsten Flensberg, Jens Paaske +1
Two-dimensional topological insulators (TIs) host gapless helical edge states that are predicted to support a quantized two-terminal conductance. Quantization is protected by time-…
Even denominator fractional quantum Hall states in higher Landau levels of graphene
Youngwook Kim, Ajit C. Balram, Takashi Taniguchi +3
An important development in the field of the fractional quantum Hall effect has been the proposal that the 5/2 state observed in the Landau level with orbital index of two…
The enigma of the fractional quantum Hall effect
Jimmy A. Hutasoit, Ajit C. Balram, Sutirtha Mukherjee +5
The fractional quantum Hall effect at , which has been definitively observed, is one of the last fractions for which no viable explanation has so far been demonstrated. Ou…
Collective excitations of a system of coupled relativistic and non-relativistic two-dimensional electron gases
Ajit C. Balram, Jimmy A. Hutasoit, Jainendra K. Jain
We study collective excitations of a two-dimensional electron system consisting of two kinds of charge carriers: relativistic or Dirac electrons with linear dispersion and non-rela…
Role of inter-edge tunneling in localizing Majorana zero modes at the ends of quasi one-dimensional p+ip systems
Jimmy A. Hutasoit, Ajit C. Balram
Potter and Lee have demonstrated the presence of Majorana zero modes at the ends of quasi one-dimensional (1-D) p+ip superconductors. We use conformal field theory (CFT) methods to…