56 citations · 298 across the 25 of their papers we have counts for
26 papers
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…
Topological zero-reflection points in multi-terminal quantum wire junctions
Abhiram Soori, Udit Khanna, Diptiman Sen
We study scattering in noninteracting multi-terminal quantum wire junctions and show that junctions with dihedral symmetry can exhibit exact zero-reflection points for te…
Synthetic Flat Bands, Hierarchical Topology, and Phase-Fluctuation-Insensitive Quantized Transconductance in Josephson Junctions
Subhadeep Chakraborty, Aabir Mukhopadhyay, Udit Khanna +1
We uncover hierarchy of topological phases within the synthetic Brillouin zone of a three-terminal Josephson junction's (3-TJJ's) Bogoliubov-de Gennes spectrum. We demonstrate that…
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…
Energy Gap Modulation in Proximitized Superconducting Puddles of Graphene
Yuxiao Wu, Udit Khanna, Eyal Walach +2
We investigated proximity-induced superconductivity in a graphene-insulating InO bilayer system through gate-controlled transport measurements. Distinct oscillations in the differe…
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…
Decoherence in electron transport: back-scattering, effect on interference and rectification
Abhiram Soori, Udit Khanna
Decoherence is an undesirable, but ubiquitous phenomenon in quantum systems. Here, we study the effect of partial decoherence, induced via a Büttiker probe, on two-terminal electro…
Anomalous topology and synthetic flat band in multi-terminal Josephson Junctions
Aabir Mukhopadhyay, Udit Khanna, Sourin Das
Andreev bound states trapped in a multi-terminal Josephson junction (JJ) can be assigned a synthetic band topology owing to their periodic dependence on the Josephson phase bias. W…
Phase diagram of the quantum Hall state in bilayer graphene
Udit Khanna, Ke Huang, Ganpathy Murthy +5
Bilayer graphene exhibits a rich phase diagram in the quantum Hall regime, arising from a multitude of internal degrees of freedom, including spin, valley, and orbital indices. The…
Quantum spin Hall insulator in proximity with a superconductor: Transition to the Fulde-Ferrell-Larkin-Ovchinnikov state driven by a Zeeman field
Suman Jyoti De, Udit Khanna, Sumathi Rao +1
We investigate the effects of introducing a boost (a Zeeman field parallel to the spin quantization axis) at the proximitized helical edge of a two-dimensional (2D) quantum spin Ha…
Enhancement of Superconductivity upon reduction of carrier density in proximitized graphene
Gopi Nath Daptary, Udit Khanna, Eyal Walach +3
The superconducting transition temperature (Tc) of a single layer graphene coupled to an Indium oxide (InO) film, a low carrier-density superconductor, is found to increase with de…
Edge Reconstruction and Emergent Neutral Modes in Integer and Fractional Quantum Hall Phases
Udit Khanna, Moshe Goldstein, Yuval Gefen
This paper comprises a review of our recent works on fractional chiral modes that emerge due to edge reconstruction in integer and fractional quantum Hall (QH) phases. The new part…
Emergence of Neutral Modes in Laughlin-like Fractional Quantum Hall Phases
Udit Khanna, Moshe Goldstein, Yuval Gefen
Chiral gapless boundary modes are characteristic of quantum Hall (QH) states. For hole-conjugate fractional QH phases counterpropagating edge modes (upstream and downstream) are ex…
Parafermions in a multilegged geometry: Towards a scalable parafermionic network
Udit Khanna, Moshe Goldstein, Yuval Gefen
Parafermionic zero modes are non-Abelian excitations which have been predicted to emerge at the boundary of topological phases of matter. Contrary to earlier proposals, here we sho…
Edge Reconstruction of a Time-Reversal Invariant Insulator: Compressible-Incompressible Stripes
Udit Khanna, Yuval Gefen, Ora Entin-Wohlman +1
Two-dimensional (2D) topological electronic insulators are known to give rise to gapless edge modes, which underlie low energy dynamics, including electrical and thermal transport.…
Chiral detection of Majorana bound states at the edge of a quantum spin Hall insulator
Vivekananda Adak, Aabir Mukhopadhyay, Suman Jyoti De +3
A hybrid setup consisting of a superconductivity-proximitized quantum spin Hall (QSH) insulator and a quantum anomalous Hall (QAH) insulator is proposed for chiral injection of ele…
Fractional Edge Reconstruction in Integer Quantum Hall Phases
Udit Khanna, Moshe Goldstein, Yuval Gefen
Protected edge modes are the cornerstone of topological states of matter. The simplest example is provided by the integer quantum Hall state at Landau level filling unity, which sh…
Magnetic Flux Periodicity in Second Order Topological Superconductors
Suman Jyoti De, Udit Khanna, Sumathi Rao
The magnetic flux periodicity of is a well known manifestation of Cooper pairing in typical s-wave superconductors. In this paper we theoretically show that the flu…
Symmetry and correlation effects on band structure explain the anomalous transport properties of (111) LaAlO/SrTiO
Udit Khanna, Prasanna K. Rout, Michael Mograbi +5
The interface between the two insulating oxides SrTiO and LaAlO gives rise to a two-dimensional electron system with intriguing transport phenomena, including superconducti…
Spin Mode-Switching at the Edge of a Quantum Hall System
Udit Khanna, Ganpathy Murthy, Sumathi Rao +1
Quantum Hall states can be characterized by their chiral edge modes. Upon softening the edge potential, the edge has long been known to undergo spontaneous reconstruction driven by…
- transitions in a Josephson junction of irradiated Weyl semimetal
Udit Khanna, Sumathi Rao, Arijit Kundu
We propose a setup for the experimental realization of unexpected and anisotropic - transitions of the Josephson current, in a junction whose link is made of irradiated Weyl…
Chiral nodes and oscillations in the Josephson current in Weyl semimetals
Udit Khanna, Dibya Kanti Mukherjee, Arijit Kundu +1
The separation of the Weyl nodes in a broken time-reversal symmetric Weyl semimetal leads to helical quasi-particle excitations at the Weyl nodes, which, when coupled with overall…
Proximity induced superconductivity in Weyl semi-metals
Udit Khanna, Arijit Kundu, Saurabh Pradhan +1
We introduce superconducting proximity effects in Weyl semi-metals (WSM) with broken time reversal symmetry by tunnel coupling one of its surfaces to an s-wave superconductor using…