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Hongkun Park
Harvard University
PhysicsMaterials scienceCondensed matter physicsDiamondNanowire
193Publications
54H-index
19.6kCitations
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Publications 176
Newest
#1Mihir K. Bhaskar (Harvard University)H-Index: 8
#2R. Riedinger (Harvard University)H-Index: 2
Last. Denis Sukachev (Harvard University)H-Index: 10
view all 11 authors...
The ability to communicate quantum information over long distances is of central importance in quantum science and engineering1. Although some applications of quantum communication such as secure quantum key distribution2,3 are already being successfully deployed4–7, their range is currently limited by photon losses and cannot be extended using straightforward measure-and-repeat strategies without compromising unconditional security8. Alternatively, quantum repeaters9, which utilize intermediate...
5 CitationsSource
#1E. N. KnallH-Index: 2
#2Mihir K. BhaskarH-Index: 8
Last. Marko LoncarH-Index: 55
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#1Jeffrey Abbott (Harvard University)H-Index: 4
#2Tianyang Ye (Harvard University)H-Index: 2
Last. Donhee Ham (Harvard University)H-Index: 27
view all 10 authors...
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...
5 CitationsSource
#1Joonhee ChoiH-Index: 7
#2Hengyun ZhouH-Index: 4
Last. Mikhail D. LukinH-Index: 90
view all 13 authors...
Understanding the coordination of cell division timing is one of the outstanding questions in the field of developmental biology. One active control parameter of the cell cycle duration is temperature, as it can accelerate or decelerate the rate of biochemical reactions. However, controlled experiments at the cellular-scale are challenging due to the limited availability of biocompatible temperature sensors as well as the lack of practical methods to systematically control local temperatures and...
1 Citations
#1Ji Ho SungH-Index: 15
#2You ZhouH-Index: 21
Last. Hongkun ParkH-Index: 54
view all 18 authors...
Structural engineering of van der Waals heterostructures via stacking and twisting has recently been used to create moir\'e superlattices, enabling the realization of new optical and electronic properties in solid-state systems. In particular, moir\'e lattices in twisted bilayers of transition metal dichalcogenides (TMDs) have been shown to lead to exciton trapping, host Mott insulating and superconducting states, and act as unique Hubbard systems whose correlated electronic states can be detect...
#1Giovanni ScuriH-Index: 3
#2Trond AndersenH-Index: 7
Last. Hongkun ParkH-Index: 54
view all 17 authors...
The twist degree of freedom provides a powerful new tool for engineering the electrical and optical properties of van der Waals heterostructures. Here, we show that the twist angle can be used to control the spin-valley properties of transition metal dichalcogenide bilayers by changing the momentum alignment of the valleys in the two layers. Specifically, we observe that the interlayer excitons in twisted WSe_2WSe_2bilayers exhibit a high (>60%) degree of circular polarization (DOCP) and l...
The optical and electronic properties of van der Waals (vdW) heterostructures depend strongly on the atomic stacking order of the constituent layers. This is exemplified by periodic variation of the local atomic registry, known as moire patterns, giving rise to superconductivity and ferromagnetism in twisted bilayer graphene and novel exciton states in transition metal dichalcogenides (TMD) heterobilayers. However, the presence of the nanometer-scale moire superlattices is typically deduced indi...
#1Andrew Y. JoeH-Index: 1
#1Andrew JoeH-Index: 2
Last. Philip Kim (Harvard University)H-Index: 84
view all 18 authors...
Excitons are composite bosons that can feature spin singlet and triplet states. In usual semiconductors, without an additional spin-flip mechanism, triplet excitons are extremely inefficient optical emitters. Large spin-orbit coupling in transition metal dichalcogenides (TMDs) couples circularly polarized light to excitons with selective valley and spin. Here, we demonstrate electrically controlled brightening of spin-triplet interlayer excitons in a MoSe_2WSe_2TMD van der Waals (vdW) hete...
2 Citations
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