739 citations · 2.1k across the 60 of their papers we have counts for
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Supermoiré-trapped quadrupolar exciton
Anish Kumar, Suman Chatterjee, Kenji Watanabe +2
Moiré-trapped dipolar interlayer exciton in heterobilayers offers a rich platform to explore interaction-driven phenomena. Extending the number of layers to three and beyond leads…
Confined exciton polaron in MoS on twisted-hBN
Garima Gupta, Mayank Chhaperwal, Pankaj Kumar +5
The simple electrostatic picture of a trion is that of an excess charge inducing an exciton polarization and binding closer (farther) to the hole (electron) side of it. Trion forma…
The origin and promise of transition metal dichalcogenide hosted single photon emitters for quantum technologies
Mayank Chhaperwal, Amartyaraj Kumar, Kausik Majumdar
Single photon emitters (SPEs) are integral parts of several quantum technology implementations. Over the past decade or so, monolayers of transition metal dichalcogenides (TMDCs) h…
Observation of moiré trapped biexciton through sub-diffraction-limit probing using hetero-bilayer on nanopillar
Mayank Chhaperwal, Suman Chatterjee, Suchithra Puliyassery +6
The ability to tune the degree of interaction among particles at the nanoscale is highly intriguing. The spectroscopic signature of such interaction is often subtle and requires sp…
Simultaneously enhancing brightness and purity of WSe single photon emitter using high-aspect-ratio nanopillar array on metal
Mayank Chhaperwal, Himanshu Madhukar Tongale, Patrick Hays +4
Monolayer semiconductor transferred on nanopillar arrays provides site-controlled, on-chip single photon emission, which is a scalable light source platform for quantum technologie…
Motion of 2D exciton in momentum space leads to pseudospin distribution narrowing on the Bloch Sphere
Garima Gupta, Kenji Watanabe, Takashi Taniguchi +1
Motional narrowing implies narrowing induced by motion, for example, in nuclear resonance, the thermally induced random motion of the nuclei in an inhomogeneous environment leads t…
Tensile strain induced brightening of momentum forbidden dark exciton in WS
Tamaghna Chowdhury, Sagnik Chatterjee, Dibyasankar Das +8
Transition-metal dichalcogenides (TMDs) host tightly bound quasi-particles called excitons. Based on spin and momentum selection rules, these excitons can be either optically brigh…
Polarized and narrow excitonic emission from graphene-capped monolayer WS through resonant phonon relaxation
Garima Gupta, Kausik Majumdar
The broadening and polarization of excitonic luminescence in monolayer TMDs largely suffer from inhomogeneity and temperature - an unresolved problem to date. In this work, through…
Harmonic to anharmonic tuning of moiré potential leading to unconventional Stark effect and giant dipolar repulsion in WS/WSe heterobilayer
Suman Chatterjee, Medha Dandu, Pushkar Dasika +6
Excitonic states trapped in harmonic moiré wells of twisted heterobilayers is an intriguing testbed. However, the moiré potential is primarily governed by the twist angle, and its…
Optical manipulation of layer-valley coherence via strong exciton-photon coupling in microcavities
Mandeep Khatoniar, Nicholas Yama, Areg Ghazaryan +4
Coherent control and manipulation of quantum degrees of freedom such as spins forms the basis of emerging quantum technologies. In this context, the robust valley degree of freedom…
Integration of 3-level MoS multi-bridge channel FET with 2D layered contact and gate dielectric
Hitesh S, Pushkar Dasika, Kenji Watanabe +2
Multi-bridge channel field effect transistor (MBCFET) provides several advantages over FinFET technology and is an attractive solution for sub-5 nm technology nodes. MBCFET is a na…
Highly nonlinear biexcitonic photocurrent from ultrafast inter-layer charge transfer
Sarthak Das, Garima Gupta, Suman Chatterjee +3
Strong Coulomb interaction in monolayer semiconductors allows them to host optically active large many-body states, such as the five-particle state, charged biexciton. Strong nonli…
Trion-trion annihilation in monolayer WS
Suman Chatterjee, Garima Gupta, Sarthak Das +3
Strong Coulomb interaction in monolayer transition metal dichalcogenides can facilitate nontrivial many-body effects among excitonic complexes. Many-body effects like exciton-excit…
Probing biexciton in monolayer WS through controlled many-body interaction
Suman Chatterjee, Sarthak Das, Garima Gupta +3
The monolayers of semiconducting transition metal dichalcogenides host strongly bound excitonic complexes and are an excellent platform for exploring many-body physics. Here we dem…
Electrically Tunable Localized versus Delocalized Intralayer Moiré Excitons and Trions in a Twisted MoS Bilayer
Medha Dandu, Garima Gupta, Pushkar Dasika +3
Moiré superlattice-induced sub-bands in twisted van der Waals homo- and hetero-structures govern their optical and electrical properties, rendering additional degrees of freedom su…
Observation of ~100% valley-coherent excitons in monolayer MoS2 through giant enhancement of valley coherence time
Garima Gupta, Kenji Watanabe, Takashi Taniguchi +1
In monolayer transition metal dichalcogenide semiconductors, valley coherence degrades rapidly due to a combination of fast scattering and inter-valley exchange interaction. This l…
Accurate Extraction of Schottky Barrier Height and Universality of Fermi Level De-pinning of van der Waals Contacts
Krishna Murali, Medha Dandu, Kenji Watanabe +2
Due to Fermi level pinning (FLP), metal-semiconductor contact interfaces result in a Schottky barrier height (SBH), which is usually difficult to tune. This makes it challenging to…
Contact-Barrier Free, High Mobility, Dual-Gated Junctionless Transistor Using Tellurium Nanowire
Pushkar Dasika, Debadarshini Samantaray, Krishna Murali +5
Gate-all-around nanowire transistor, due to its extremely tight electrostatic control and vertical integration capability, is a highly promising candidate for sub-5 nm technology n…
Highly tunable layered exciton in bilayer WS: linear quantum confined Stark effect versus electrostatic doping
Sarthak Das, Medha Dandu, Garima Gupta +6
In 1H monolayer transition metal dichalcogenide, the inversion symmetry is broken, while the reflection symmetry is maintained. On the contrary, in the bilayer, the inversion symme…
Anomalous Stark Shift of Excitonic Complexes in Monolayer Semiconductor
Nithin Abraham, Kenji Watanabe, Takashi Taniguchi +1
Monolayer transition metal dichalcogenide semiconductors host strongly bound two-dimensional excitonic complexes, and form an excellent platform for probing many-body physics throu…
Astability versus Bistability in van der Waals Tunnel Diode for Voltage Controlled Oscillator and Memory Applications
Nithin Abraham, Krishna Murali, Kenji Watanabe +2
Van der Waals (vdW) tunnel junctions are attractive due to their atomically sharp interface, gate tunablity, and robustness against lattice mismatch between the successive layers.…
Anharmonicity in Raman-active phonon modes in atomically thin MoS
Suman Sarkar, Indrajit Maity, H. L. Pradeepa +10
Phonon-phonon anharmonic effects have a strong influence on the phonon spectrum; most prominent manifestation of these effects are the softening (shift in frequency) and broadening…
Unified benchmarking and characterization protocol for nanomaterial-based heterogeneous photodetector technologies
Nithin Abraham, Kausik Majumdar
Over the last few years, there has been a rapid growth towards demonstrating highly sensitive, fast photodetectors using photoactive nano-materials. As with any other developing an…
Gate- and Light-Tunable Negative Differential Resistance with High Peak Current Density in 1T-TaS/2H-MoS T-Junction
Mehak Mahajan, Kausik Majumdar
Metal-based electronics is attractive for fast and radiation-hard electronic circuits and remains one of the longstanding goals for researchers. The emergence of 1T-TaS, a laye…