260 citations · 2.2k across the 66 of their papers we have counts for
17 papers · 1 filter
Van Hove singularity-driven giant Nernst signal in twisted double bilayer graphene
Ujjal Roy, Monosij Roy, Unmesh Ghorai +8
Twisted graphene layers host van Hove singularities (vHSs), peaks in the electronic density of states, thought to drive exotic phases in moiré materials, but their effect on therma…
Symmetry broken states at high displacement fields in ABA trilayer graphene
Simrandeep Kaur, Unmesh Ghorai, Abhisek Samanta +4
In this Letter, we present a comprehensive study of magnetotransport in high-mobility trilayer graphene (TLG) devices under a transverse displacement field, focusing on symmetry-br…
Controlling particle-hole symmetry of fractional quantum hall states in trilayer graphene
Simrandeep Kaur, Harsimran Singh, Kenji Watanabe +5
We present a detailed experimental study of the particle-hole symmetry (PHS) of the fractional quantum Hall (FQH) states about half filling in a multiband system. Specifically, we…
Evidence of a compensated semimetal with electronic correlations at the CNP of twisted double bilayer graphene
Ayan Ghosh, Souvik Chakraborty, Unmesh Ghorai +5
Recently, magic-angle twisted bilayer graphene (MATBLG) has shown the emergence of various interaction-driven novel quantum phases at the commensurate fillings of the moir'e superl…
Non-equilibrium scalar field dynamics starting from Fock states: Absence of thermalization in one dimensional phonons coupled to fermions
Md Mursalin Islam, Rajdeep Sensarma
We propose a new method to study non-equilibrium dynamics of scalar fields starting from non-Gaussian initial conditions using Keldysh field theory. We use it to study dynamics of…
Trigonal Warping, Satellite Dirac Points and Multiple Field Tuned Topological Transitions in Twisted Double Bilayer Graphene
Priyanka Mohan, Unmesh Ghorai, Rajdeep Sensarma
We show that the valley Chern number of the low energy band in twisted double bilayer graphene can be tuned through two successive topological transitions, where the direct bandgap…
Macroscopic, layered onion shell like magnetic domain structure generated in YIG film using ultrashort, megagauss magnetic pulses
Kamalika Nath, P. C. Mahato, Moniruzzaman Shaikh +6
Study of the formation and evolution of large scale, ordered structures is an enduring theme in science. The generation, evolution and control of large sized magnetic domains are i…
Tunable bandwidths and gaps in twisted double bilayer graphene system on the verge of correlations
Pratap Chandra Adak, Subhajit Sinha, Unmesh Ghorai +5
We use temperature-dependent resistivity in small-angle twisted double bilayer graphene to measure bandwidths and gaps of the bands. This electron-hole asymmetric system has one se…
Marginally Self-Averaging One-Dimensional Localization in Bilayer Graphene
Md. Ali Aamir, Paritosh Karnatak, Aditya Jayaraman +4
The combination of field tunable bandgap, topological edge states, and valleys in the band structure, makes insulating bilayer graphene a unique localized system, where the scaling…
Landau level diagram and the continuous rotational symmetry breaking in trilayer graphene
Biswajit Datta, Hitesh Agarwal, Abhisek Samanta +5
The sequence of the zeroth Landau levels (LLs) between filling factors =-6 to 6 in ABA-stacked trilayer graphene (TLG) is unknown because it depends sensitively on the non-unifo…
Braids and phase gates through high-frequency virtual tunneling of Majorana Zero Modes
Pranay Gorantla, Rajdeep Sensarma
Braiding of non-Abelian Majorana anyons is a first step towards using them in quantum computing. We propose a protocol for braiding Majorana zero modes formed at the edges of nanow…
Strong electronic interaction and multiple quantum Hall ferromagnetic phases in trilayer graphene
Biswajit Datta, Santanu Dey, Abhisek Samanta +5
There is an increasing interest in the electronic properties of few layer graphene as it offers a platform to study electronic interactions because the dispersion of bands can be t…
Tunable Superlattice in Graphene To Control the Number of Dirac Points
Sudipta Dubey, Vibhor Singh, Ajay K. Bhat +6
Superlattice in graphene generates extra Dirac points in the band structure and their number depends on the superlattice potential strength. Here, we have created a lateral superla…
Density fluctuation effects on the exciton condensate in double layer graphene
D. S. L. Abergel, Rajdeep Sensarma, S. Das Sarma
We describe the robustness of an excitonic condensate in double layer graphene against layer density fluctuations and the associated charge inhomogeneity, and discuss the implicati…
Coulomb drag in monolayer and bilayer graphene
E. H. Hwang, Rajdeep Sensarma, S. Das Sarma
We theoretically calculate the interaction-induced frictional Coulomb drag resistivity between two graphene monolayers as well as between two graphene bilayers, which are spatially…
Correlations, Plasmarons, and Quantum Spectral Function in Bilayer Graphene
Rajdeep Sensarma, E. H. Hwang, S. Das Sarma
We theoretically study the many-body effects of electron electron interaction on the single particle spectral function of doped bilayer graphene. Using random phase approximation,…
Plasmon-phonon coupling in graphene
E. H. Hwang, Rajdeep Sensarma, S. Das Sarma
Collective excitations of coupled electron-phonon systems are calculated for both monolayer and bilayer graphene, taking into account the non-perturbative Coulomb coupling between…