1.4k citations · 3.4k across the 19 of their papers we have counts for
19 papers
Controlled defect production in monolayer MoS2 via electron irradiation at ultralow accelerating voltages
Ajit Kumar Dash, Hariharan Swaminathan, Ethan Berger +7
Control on spatial location and density of defects in 2D materials can be achieved using electron beam irradiation. Conversely, ultralow accelerating voltages (less than or equal t…
Tuning exciton complexes in twisted bilayer WSe2 at intermediate misorientation
Rahul Debnath, Shaili Sett, Sudipta Kundu +5
Twist angle modifies the band alignment, screening, and interlayer (IL) coupling in twisted bilayers (tBLs) of transition metal dichalcogenides. Intermediate misorientation (twist…
Effect of electron-irradiation on layered quantum materials
Ajit Kumar Dash, Mainak Mondal, Manvi Verma +2
Technological advancement towards the quantum era requires secure communication, quantum computation, and ultra-sensitive sensing capabilities. Layered quantum materials (LQMs) hav…
Moiré and beyond in transition metal dichalcogenide twisted bilayers
Kha Tran, Junho Choi, Akshay Singh
Fabricating van der Waals (vdW) bilayer heterostructures (BL-HS) by stacking the same or different two-dimensional (2D) layers, offers a unique physical system with rich electronic…
Twist Angle Dependent Interlayer Exciton Lifetimes in van der Waals Heterostructures
Junho Choi, Matthias Florian, Alexander Steinhoff +15
In van der Waals (vdW) heterostructures formed by stacking two monolayers of transition metal dichalcogenides, multiple exciton resonances with highly tunable properties are formed…
Growth kinetics and atomistic mechanisms of native oxidation of ZrSSe and MoS crystals
Seong Soon Jo, Akshay Singh, Liqiu Yang +14
A thorough understanding of native oxides is essential for designing semiconductor devices. Here we report a study of the rate and mechanisms of spontaneous oxidation of bulk singl…
Direct Optical-Structure Correlation in Atomically Thin Dichalcogenides and Heterostructures
Akshay Singh, Hae Yeon Lee, Silvija Gradecak
Atomically thin transition metal dichalcogenides (TMDs) have distinct opto-electronic properties including enhanced luminescence and high on-off current ratios, which can be furthe…
Near-infrared optical properties and proposed phase-change usefulness of transition metal disulfides
Akshay Singh, Yifei Li, Balint Fodor +6
The development of photonic integrated circuits would benefit from a wider selection of materials that can strongly-control near-infrared (NIR) light. Transition metal dichalcogeni…
Moiré Excitons in Van der Waals Heterostructures
Kha Tran, Galan Moody, Fengcheng Wu +19
In van der Waals (vdW) heterostructures formed by stacking two monolayer semiconductors, lattice mismatch or rotational misalignment introduces an in-plane moiré superlattice. Whil…
Biexciton fine structure in monolayer transition metal dichalcogenides
Alexander Steinhoff, Matthias Florian, Akshay Singh +8
The optical properties of atomically thin transition metal dichalcogenide (TMDC) semiconductors are shaped by the emergence of correlated many-body complexes due to strong Coulomb…
Cathodoluminescence as an Effective Probe of Carrier Transport and Deep Level Defects in Droop-Mitigating InGaN/GaN Quantum Well Heterostructures
Zhibo Zhao, Akshay Singh, Jordan Chesin +7
Commercial InGaN/GaN light emitting diode heterostructures continue to suffer from efficiency droop at high current densities. Droop mitigation strategies target Auger recombinatio…
Disorder Dependent Valley Properties in Monolayer WSe2
Kha Tran, Akshay Singh, Joe Seifert +7
We investigate the effect on disorder potential on exciton valley polarization and valley coherence in monolayer WSe2. By analyzing polarization properties of photoluminescence, th…
Neutral and Charged Inter-Valley Biexcitons in Monolayer MoSe
Kai Hao, Lixiang Xu, Judith F. Specht +10
In atomically thin transition metal dichalcogenides (TMDs), reduced dielectric screening of the Coulomb interaction leads to strongly correlated many-body states, including exciton…
Long-Lived Valley Polarization of Intra-Valley Trions in Monolayer WSe2
Akshay Singh, Kha Tran, Mirco Kolarczik +9
We investigate valley dynamics associated with trions in monolayer tungsten diselenide (WSe2) using polarization resolved two-color pump-probe spectroscopy. When tuning the pump an…
Coherent and Incoherent Coupling Dynamics between Neutral and Charged Excitons in Monolayer MoSe2
Kai Hao, Lixiang Xu, Philipp Nagler +7
The optical properties of semiconducting transition metal dichalcogenides are dominated by both neutral excitons (electron-hole pairs) and charged excitons (trions) that are stable…
Enhanced spin lifetimes in a two dimensional electron gas in a gate-controlled GaAs quantum well
Sergiu Anghel, Akshay Singh, Felix Passmann +5
Exciton, trion and electron spin dynamics in a 20 nm wide modulation-doped GaAs single quantum well are investigated using resonant ultrafast two-color Kerr rotation spectroscopy.…
Trion Formation Dynamics in Monolayer Transition Metal Dichalcogenides
Akshay Singh, Galan Moody, Kha Tran +13
We report charged exciton (trion) formation dynamics in doped monolayer transition metal dichalcogenides (TMDs), specifically molybdenum diselenide (MoSe2), using resonant two-colo…
Intrinsic Exciton Linewidth in Monolayer Transition Metal Dichalcogenides
Galan Moody, Chandriker Kavir Dass, Kai Hao +10
Monolayer transition metal dichalcogenides feature Coulomb-bound electron-hole pairs (excitons) with exceptionally large binding energy and coupled spin and valley degrees of freed…
Coherent Electronic Coupling in Atomically Thin MoSe2
Akshay Singh, Galan Moody, Sanfeng Wu +6
We report the first direct spectroscopic evidence for coherent electronic coupling between excitons and trions in atomically thin transition metal dichalcogenides, specifically mon…