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Hongkun Park
Harvard University
180Publications
49H-index
16.2kCitations
Publications 180
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#1F. Alex CevallosH-Index: 1
#2Shu GuoH-Index: 1
Last.Hongkun ParkH-Index: 49
view all 11 authors...
The growth of single crystals of MoS2 and WS2 by materials transport through a liquid salt flux made from a low-melting mixture of NaCl and CsCl is presented. The crystals are structurally characterized by single-crystal X-ray diffraction, which reveals that the 2H-MoS2 crystals contain a very small percentage (about 3%) of 3R intergrowths and that the 2H-WS2 crystals display less than 1% of 3R intergrowths. Characterization of the crystals by scanning electron microscopy is presented as are pho...
#1Jeffrey Abbott (Harvard University)H-Index: 4
#2Tianyang Ye (Harvard University)H-Index: 2
Last.Donhee Ham (Harvard University)H-Index: 25
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Current electrophysiological or optical techniques cannot reliably perform simultaneous intracellular recordings from more than a few tens of neurons. Here we report a nanoelectrode array that can simultaneously obtain intracellular recordings from thousands of connected mammalian neurons in vitro. The array consists of 4,096 platinum-black electrodes with nanoscale roughness fabricated on top of a silicon chip that monolithically integrates 4,096 microscale amplifiers, configurable into pseudoc...
#1Mihir K. BhaskarH-Index: 6
#2Ralf RiedingerH-Index: 5
Last.Denis D. SukachevH-Index: 9
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The ability to communicate quantum information over long distances is of central importance in quantum science and engineering. For example, it enables secure quantum key distribution (QKD) relying on fundamental principles that prohibit the "cloning" of unknown quantum states. While QKD is being successfully deployed, its range is currently limited by photon losses and cannot be extended using straightforward measure-and-repeat strategies without compromising its unconditional security. Alterna...
We realize an elementary quantum network node consisting of a silicon-vacancy (SiV) color center inside a diamond nanocavity coupled to a nearby nuclear spin with 100 ms long coherence times. Specifically, we describe experimental techniques and discuss effects of strain, magnetic field, microwave driving, and spin bath on the properties of this 2-qubit register. We then employ these techniques to generate Bell-states between the SiV spin and an incident photon as well as between the SiV spin an...
#2Denis D. SukachevH-Index: 9
Last.Marko Loncar MH-Index: 51
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Quantum networks require functional nodes consisting of stationary registers with the capability of high-fidelity quantum processing and storage, which efficiently interface with photons propagating in an optical fiber. We report a significant step towards realization of such nodes using a diamond nanocavity with an embedded silicon-vacancy (SiV) color center and a proximal nuclear spin. Specifically, we show that efficient SiV-cavity coupling (with cooperativity C >30 provides a nearly-deter...
#1Hengyun ZhouH-Index: 2
Last.Paola CappellaroH-Index: 23
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Quantum metrology makes use of coherent superpositions to detect weak signals. While in principle the sensitivity can be improved by increasing the density of sensing particles, in practice this improvement is severely hindered by interactions between them. Using a dense ensemble of interacting electronic spins in diamond, we demonstrate a novel approach to quantum metrology. It is based on a new method of robust quantum control, which allows us to simultaneously eliminate the undesired effects ...
#1Gangtae Jin (POSTECH: Pohang University of Science and Technology)H-Index: 3
#2Changsoo Lee (POSTECH: Pohang University of Science and Technology)H-Index: 25
Last.Hoseok Heo (Harvard University)H-Index: 10
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We report wafer-scale growth of atomically thin, three-dimensional (3D) van der Waals (vdW) semiconductor membranes. By controlling the growth kinetics in the near-equilibrium limit during metal-organic chemical vapor depositions of MoS2 and WS2 monolayer (ML) crystals, we have achieved conformal ML coverage on diverse 3D texture substrates, such as periodic arrays of nanoscale needles and trenches on quartz and SiO2/Si substrates. The ML semiconductor properties, such as channel resistivity and...
#1F. Alex CevallosH-Index: 1
#2Shu GuoH-Index: 1
Last.Hongkun ParkH-Index: 49
view all 0 authors...
The growth of single crystals of MoS2 and WS2 by materials transport through a liquid salt flux made from a low melting mixture of NaCl and CsCl is described. The crystals are characterized by single crystal X-ray diffraction, which reveals that they are 2H-MoS2 with a small percentage (about 3%) of 3R intergrowths. The 2H-WS2 crystals display less than 1% of 3R intergrowths. Photoluminescence spectra of exfoliated monolayers suggest that MoS2 grown by this method has superior crystallinity in c...
#1Alan DibosH-Index: 3
#2You ZhouH-Index: 18
Last.Philip KimH-Index: 81
view all 11 authors...
We realize a new electroplasmonic switch based upon electrically tunable exciton–plasmon interactions. The device consists of a hexagonal boron nitride (hBN)-encapsulated tungsten diselenide (WSe2) monolayer on top of a single-crystalline silver substrate. The ultrasmooth silver substrate serves a dual role as the medium to support surface plasmon polaritons (SPPs) and the bottom gate electrode to tune the WSe2 exciton energy and brightness through electrostatic doping. To enhance the exciton–pl...
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