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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…
Dephasing of InAs quantum dot p-shell excitons using two-dimensional coherent spectroscopy
Takeshi Suzuki, Rohan Singh, Galan Moody +5
The dephasing mechanisms of p-shell and s-shell excitons in an InAs self-assembled quantum dot ensemble are examined using two-dimensional coherent spectroscopy (2DCS). 2DCS provid…
Microsecond Valley Lifetime of Defect-Bound Excitons in Monolayer WSe
Galan Moody, Kha Tran, Xiaobo Lu +6
In atomically thin two-dimensional semiconductors such as transition metal dichalcogenides (TMDs), controlling the density and type of defects promises to be an effective approach…
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…
Trion Valley Coherence in Monolayer Semiconductors
Kai Hao, Lixiang Xu, Fengcheng Wu +8
The emerging field of valleytronics aims to exploit the valley pseudospin of electrons residing near Bloch band extrema as an information carrier. Recent experiments demonstrating…
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…
Optical amplitude and phase modulation dynamics at the single-photon level in a quantum dot ridge waveguide
Galan Moody, Corey McDonald, Ari Feldman +3
The amplitude and phase of a material's nonlinear optical response provide insight into the underlying electronic dynamics that determine its optical properties. Phase-sensitive no…
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…
Exciton Dynamics in Monolayer Transition Metal Dichalcogenides
Galan Moody, John Schaibley, Xiaodong Xu
Since the discovery of semiconducting monolayer transition metal dichalcogenides, a variety of experimental and theoretical studies have been carried out seeking to understand the…
Electronic Coherence Control in a Charged Quantum Dot
Galan Moody, Corey McDonald, Ari Feldman +3
Minimizing decoherence due to coupling of a quantum system to its fluctuating environment is at the forefront of quantum information science and photonics research. Nature sets the…
Direct Measurement of Exciton Valley Coherence in Monolayer WSe
Kai Hao, Galan Moody, Fengcheng Wu +7
In crystals, energy band extrema in momentum space can be identified by their valley index. The internal quantum degree of freedom associated with valley pseudospin indices can act…
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…
Homogeneous Linewidth Narrowing of the Charged Exciton via Nuclear Spin Screening in an InAs/GaAs Quantum Dot Ensemble
G. Moody, M. Feng, C. McDonald +2
In semiconductor quantum dots, the electron hyperfine interaction with the nuclear spin bath is the leading source of spin decoherence at cryogenic temperature. Using high-resoluti…
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…
Exciton-Trion Coherent Interactions in a CdTe/CdMgTe Quantum Well
G. Moody, I. A. Akimov, H. Li +7
We present a collection of zero-, one- and two-quantum two-dimensional coherent spectra of excitons and trions in a CdTe/(Cd,Mg)Te quantum well. The set of spectra provides a uniqu…
Coherent Excitonic Coupling in an Asymmetric Double InGaAs Quantum Well Arises from Many-Body Effects
Gael Nardin, Galan Moody, Rohan Singh +4
We study an asymmetric double InGaAs quantum well using optical two-dimensional coherent spectroscopy. The collection of zero-quantum, one-quantum, and two-quantum two-dimensional…
Correlation and dephasing effects on the non-radiative coherence between bright excitons in an InAs QD ensemble measured with 2D spectroscopy
Galan Moody, Rohan Singh, Hebin Li +5
Exchange-mediated fine-structure splitting of bright excitons in an ensemble of InAs quantum dots is studied using optical two-dimensional Fourier-transform spectroscopy. By monito…
Fifth-order nonlinear optical response of excitonic states in an InAs quantum dot ensemble measured with 2D spectroscopy
G. Moody, R. Singh, H. Li +5
Exciton, trion and biexciton dephasing rates are measured within the inhomogeneous distribution of an InAs quantum dot (QD) ensemble using two-dimensional Fourier-transform spectro…