Patrick Hays
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View article: Observation of moiré trapped biexciton through sub-diffraction-limit probing using hetero-bilayer on nanopillar
Observation of moiré trapped biexciton through sub-diffraction-limit probing using hetero-bilayer on nanopillar Open
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 special probes to observe. To this end, inter-layer excitons …
View article: Thermal and Magnetic Stability of van‐der Waals Antiferromagnet CrOCl from the Bulk to Monolayer Limit
Thermal and Magnetic Stability of van‐der Waals Antiferromagnet CrOCl from the Bulk to Monolayer Limit Open
2D magnetic materials have been at the forefront of quantum materials research owing to their attractive and exotic magnetic properties. However, most known examples of 2D magnets have low environmental and thermal stability, posing a sign…
View article: Toward high-current-density and high-frequency graphene resonant tunneling transistors
Toward high-current-density and high-frequency graphene resonant tunneling transistors Open
Negative differential resistance (NDR), a peculiar electrical property in which current decreases with increasing voltage, is highly desirable for multivalued logic gates, memory devices, and oscillators. Recently, 2D quantum-tunneling NDR…
View article: Efficacy of a Computer Tutor that Models Expert Human Tutors
Efficacy of a Computer Tutor that Models Expert Human Tutors Open
Tutoring is highly effective for promoting learning. However, the contribution of expertise to tutoring effectiveness is unclear and continues to be debated. We conducted a 9-week learning efficacy study of an intelligent tutoring system (…
View article: Valley-Hybridized Gate-Tunable 1D Exciton Confinement in MoSe<sub>2</sub>
Valley-Hybridized Gate-Tunable 1D Exciton Confinement in MoSe<sub>2</sub> Open
Controlling excitons at the nanoscale in semiconductor materials represents a formidable challenge in the quantum photonics and optoelectronics fields. Monolayers of transition metal dichalcogenides (TMDs) offer inherent 2D confinement and…
View article: Simultaneously enhancing brightness and purity of WSe$_2$ single photon emitter using high-aspect-ratio nanopillar array on metal
Simultaneously enhancing brightness and purity of WSe$_2$ single photon emitter using high-aspect-ratio nanopillar array on metal Open
Monolayer semiconductor transferred on nanopillar arrays provides site-controlled, on-chip single photon emission, which is a scalable light source platform for quantum technologies. However, the brightness of these emitters reported to da…
View article: Nature of Long-Lived Moiré Interlayer Excitons in Electrically Tunable MoS<sub>2</sub>/MoSe<sub>2</sub> Heterobilayers
Nature of Long-Lived Moiré Interlayer Excitons in Electrically Tunable MoS<sub>2</sub>/MoSe<sub>2</sub> Heterobilayers Open
Interlayer excitons in transition-metal dichalcogenide heterobilayers combine high binding energy and valley-contrasting physics with a long optical lifetime and strong dipolar character. Their permanent electric dipole enables electric-fi…
View article: Nature of long-lived moiré interlayer excitons in electrically tunable MoS$_{2}$/MoSe$_{2}$ heterobilayers
Nature of long-lived moiré interlayer excitons in electrically tunable MoS$_{2}$/MoSe$_{2}$ heterobilayers Open
Interlayer excitons in transition-metal dichalcogenide heterobilayers combine high binding energy and valley-contrasting physics with long optical lifetime and strong dipolar character. Their permanent electric dipole enables electric-fiel…
View article: Optical Imaging of Flavor Order in Flat Band Graphene
Optical Imaging of Flavor Order in Flat Band Graphene Open
Spin and valley flavor polarization plays a central role in the many-body physics of flat band graphene, with fermi surface reconstructions often accompanied by quantized anomalous Hall and superconducting state observed in a variety of ex…
View article: Revealing dark exciton signatures in polariton spectra of 2D materials
Revealing dark exciton signatures in polariton spectra of 2D materials Open
Dark excitons in transition metal dichalcogenides (TMD) have been so far neglected in the context of polariton physics due to their lack of oscillator strength. However, in tungsten-based TMDs, dark excitons are known to be the energetical…
View article: Valley-hybridized gate-tunable 1D exciton confinement in MoSe2
Valley-hybridized gate-tunable 1D exciton confinement in MoSe2 Open
Controlling excitons at the nanoscale in semiconductor materials represents a formidable challenge in the fields of quantum photonics and optoelectronics. Achieving this control holds great potential for unlocking strong exciton-exciton in…
View article: Correlated insulator of excitons in WSe2/WS2 moiré superlattices
Correlated insulator of excitons in WSe2/WS2 moiré superlattices Open
A panoply of unconventional electronic states has been observed in moiré superlattices. Engineering similar bosonic phases remains, however, largely unexplored. We report the observation of a bosonic correlated insulator in WSe2/WS2 moiré …