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Opportunity at Naval Research Laboratory   NRL

Photophysics in 2D Materials

Location

Naval Research Laboratory, DC, Electronics Science & Technology Division

opportunity location
64.15.25.C0352 Washington, DC 203755321

Advisers

name email phone
Paul David Cunningham paul.cunningham@nrl.navy.mil 202-767-4892

Description

The objective of this research effort is to understand the nonequilibrium dynamics of quasiparticles and polaritons in transition metal dicahcogenides (TMDCs) and their heterostructures.

Our work is multidisciplinary. Members of our team fabricate monolayer TMDCs (e.g., WS2, MoSe2, etc.) and other 2D materials (hBN, Graphene) by exfoliation or chemical vapor deposition. Heterostructures and other device geometries are assembled using mechanical transfer techniches. Photonic structures and device conacts are fabricated using lithographic techniques. A wide range of instruments are employed to characterize these materials: photoluminescence mapping, Raman mapping, ellipsometry, etc. Additional instrumentation resides in the Nanoscience Institute, a shared facility open to researchers on our campus. 

Our group is interested in the behavior of excitons, trions, and exciton-polaritons in TMDCs. Our research topics include:


Our Laser Lab is used to interrogate these systems with a variety of static and time-resolved spectroscopic techniques. Our facility includes
angle-resolved transmission/reflection/fluorescence with a closed cycle cryostat, photon correlation measurements via time-correlated single photon counting (TCSPC) with a  closed cycle cryostat, femptosecond transient absorption spectroscopy in the UV/VIS and NIR,  time-resolved photoluminescence via TCSPC with detectors spanning the visible and near-infrared regions, cryostats compatible with time-resolved setups, etc.

Qualified candidates should possess or be completing a PhD in physics, chemistry, or related discipline with experience in time-resolved spectroscopy. Ultrafast spectroscopy or time-resolved microscopy are a plus, as is familiarity with photophysics in either two-dimensional transition metal dichalcogenides, other low dimensional semiconductors, organic semiconductors, or other excitonic systems.

 

Recent publications:

Cunningham, et al., J. Phys. Chem. Lett. 7, 5242 (2016) – Exciton-Exciton Annihilation

Cunningham, et al., ACS Nano 11, 12601 (2017) – Bandgap Renormalization
Cunningham, et al., Nat. Commun. 10, 5539 (2019) – Valley Optical Stark Effect

key words
Photophysics; 2D materials; Transition metal dichalcogenides; van der Waals, cavities; polaritons; Spectroscopy; Time-Resolved

Eligibility

Citizenship:  Open to U.S. citizens and permanent residents
Level:  Open to Postdoctoral applicants

Stipend

Base Stipend Travel Allotment Supplementation
$94,199.00 $3,000.00
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