75 citations · 222 across the 12 of their papers we have counts for
8 papers · 1 filter
(Sub)nanoscale Visualization of Reconstruction-Driven Moiré Exciton Localization and Delocalization
Medha Dandu, Sriram Sankar, Giovanny Espitia +12
Spectral fingerprints in optical absorption and emission have typically been used as a signature of exciton localization in twisted moiré bilayers. However, the mechanism by which…
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…
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…
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…
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…
Spectrally tunable, large Raman enhancement from nonradiative energy transfer in van der Waals heterostructure
Medha Dandu, Kenji Watanabe, Takashi Taniguchi +2
Raman enhancement techniques are essential for fundamental studies in light-matter interactions and find widespread application in microelectronics, bio-chemical sensing, and clini…
Light emission from the layered metal 2H-TaSe and its potential applications
Mehak Mahajan, Sangeeth Kallatt, Medha Dandu +3
Conventional metals, in general, do not exhibit strong photoluminescence. 2H-TaSe is a layered transition metal dichalcogenide that possesses metallic property with charge dens…
Strong Single- and Two-Photon Luminescence Enhancement by Nonradiative Energy Transfer across Layered Heterostructure
Medha Dandu, Rabindra Biswas, Sarthak Das +5
The strong light-matter interaction in monolayer transition metal dichalcogenides (TMDs) is promising for nanoscale optoelectronics with their direct band gap nature and the ultra-…