44 citations · 82 across the 10 of their papers we have counts for
10 papers
Interaction driven charge transfer transitions in closely spaced graphene double layers
Kenneth A. Lin, Unmesh Ghorai, Kenji Watanabe +3
Charge transfer between two conductors is conventionally viewed as a single-particle process governed by electrostatics and band alignment. Using tunneling spectroscopy, we show th…
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…
Miniband Generation by Surface Acoustic Waves
Eli Meril, Unmesh Ghorai, Tobias Holder +1
We introduce a new class of tunable periodic structures, formed by launching two obliquely propagating surface acoustic waves on a piezoelectric substrate that supports a two-dimen…
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…
Universality of Quantum Phase Transitions in the Integer and Fractional Quantum Hall Regimes
Simrandeep Kaur, Tanima Chanda, Kazi Rafsanjani Amin +7
Fractional quantum Hall (FQH) phases emerge due to strong electronic interactions and are characterized by anyonic quasiparticles, each distinguished by unique topological paramete…
Excitonic Metal and Non-Fermi Liquid Behaviour in Twisted Double Bilayer Graphene near Charge Neutrality
Unmesh Ghorai, Ayan Ghosh, Anindya Das +1
Twisted double bilayer graphene is a compensated semi-metal near the charge neutrality point with the presence of small electron and hole pockets in its band structure. We show tha…
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…
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…
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…