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STC for Integrated Quantum MaterialsNSF Grant DMR 1231319
http://CIQM.Harvard.edu
Harvard University – PI Robert WesterveltHoward University – co-PI Gary Harris
Massachusetts Institute of Technology – co-PI Ray AshooriMuseum of Science, Boston – co-PI Carol Lynn Alpert
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Contents
• STC for Integrated Quantum Materials • Vision• Research Areas• Science and Education Community
• Center for Nanoscale Systems at Harvard• Shared facilities for materials growth,
nanofabrication, and electron microscopy• Multi-institution and multi-disciplinary users.
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10 nm
1 nm
0.1 nm
0.001 eV
0.1 eV
10 eV
electronsenergy size
10 µm
0.1 µm
1 µm
light
Quantum Engineering
22 nm CMOS
quantum electronics & photonics with atomic-scale devices
300 K
atomic NV center
vdWhetero-
structures
atomic layergraphene
color centerdiamond
diamondphotonics
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New Particles in Quantum Materials electrons & photons | Bloch waves in solids | new quantum particles
–electron
vacuum
solidsphononslower photon
photon
–e & h with m*
quantummaterials
e & h, masslessno energy gap
graphene
topological edge states for B = 0
topological insulators
300 K qubit
diamondNV centers
atom
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Quantum Information Science & Technology
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Create atomic-scale devices and systems based on quantum materials for quantum sensors,
quantum communication and quantum computers.
Atomic Layers: Graphene, BN, MoS2 – atomic scale devicesTopological Insulators – topologically protected data channelsNV Center Diamond – 1 atom memory sites, quantum sensors
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Materials & DeviceInnovation Cycle
Growth &Processing
Atomic Modeling& Understanding
Device Fabrication &
Characterization
JEOL HR STEM
CNS Imaging
STM$
MBE$
UHV$transfer$
MBE & CVD MaterialsGrowth
Experimental Test DataTheory
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Research Faculty Topologically Protected QubitsAmir Yacoby (Harvard) - leaderPratibha Dev (Howard)Liang Fu (MIT)Nuh Gedik (MIT)Bertrand I. Halperin (Harvard)Pablo Jarillo-Herrero (MIT)Philip Kim (Harvard)Leonid Levitov (MIT)Jagadeesh Moodera (MIT)
Quantum NetworksMarko Loncar (Harvard) - leaderPratibha Dev (Howard)Dirk Englund (MIT)Gary Harris (Howard)Evelyn Hu (Harvard)Efthimios Kaxiras (Harvard)Jing Kong (MIT)Tomas Palacios (MIT)
Novel vdW HeterostructuresPhilip Kim (Harvard) - leaderRay Ashoori (MIT)Tina Brower-Thomas (Howard)Donhee Ham (Harvard)Eric Heller (Harvard)Efthimios Kaxiras (Harvard)Jing Kong (MIT)Tomas Palacios (MIT)Steven Richardson (Howard)Robert Westervelt (Harvard)
Discovery of Topological CrystalsJoe Checkelsky (MIT) – leaderAlan Aspuru-Guzik (Harvard)David Bell (Harvard)Liang Fu (MIT)Nuh Gedik (MIT)Bertrand I Halperin (Harvard)Jenny Hoffman (Harvard)Tito Huber (Howard)Efthimios Kaxiras (Harvard) Jagadeesh Moodera (MIT)Thomas Searles (Howard) 7
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RA1 Novel vdW HeterostructuresPhilip Kim - Quantum Sensors
Mission – 4 Research Areas
RA2 Discovery of New Topological Crystals J. Checkelsky – Quantum
Networks & Computers
RA4 Quantum Networks with Solid State Quantum Emitters
Marko Loncar – Quantum Networks
RA3 Topologically Protected QubitsAmir Yacoby – Quantum Computers
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Research Area 1: Novel van der Waals Heterostructures led by Philip Kim
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Graphene ThermopileKong, Palacios, Jarillo-Herrero
Hsu et al. Nano Lett. (2015) 10
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Engineering band gaps in twisted bilayer graphene
Charge neutrality point
Insulating state Insulating state
Two probe conductance vs. charge density
G/G heterostructure with 1.8°twist angle
Emergent moiré pattern with " =$. & nm
Monolayer graphene
Insulating states observed at high number densities!
Cao et al. PRL (2016)
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Research Area 2: Discovery of New Topological Crystals led by Joe Checkelsky
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Topological Transistor
Liang Fu
Topo Gatestrain, E
magnetism
Active ChannelQAH edge state
!
Liang Fu PRB (2015)
E
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F. von Cube and D. Bell
Ye, Bell, Fu, Comin, JGC et al
Bulk Single CrystalsFe3Sn2 – Ferromagnetic Kagome Metal
Theoretically Predicted Kagome CrystalFe
Sn
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Research Area 3Topologically
Protected Qubitsled by
Amir Yacoby
gapped helical edge states
Majoranabound states
- kF kF 2D
Modeling hybrid devices & materials
Building blocks:Synthesis and
characterizationTesting Topological Superconductivity
TI Research
Area
vdW Materials Research Area
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Coherent Edge States in GrapheneKim & Yacoby, Research Areas 1 & 3
ba
(b) Graphene device with a narrowsuperconducting contact thattransmits correlated eh pairs viacrossed Andreev reflection. [Lee ...Yacoby, Kim Nature Physics(2017)]
(a) Current positions vs. electrondensity, from superconductinginterferometry in a grapheneJosephson junction. [Allen ...Jarillo-Herrero, Levitov, Yacoby,Nature Phys (2016)]
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Chang, Moodera, et al, Nat Mat (2015)
Vx(Bi,Sb)2-xTe3
Quantum Anomalous Hall Effect
Improved QAH phase from original report by Chang, Xue et al (2013)
Quantum Hall Effect at Zero Magnetic Field
Driven by Ferromagnetism
T = 25 mK
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Research Area 4: Quantum Networks with Solid State Quantum Emitters led by Marko Loncar
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Blueprint: M. Pant, H. Choi, et al, arXiv:1704.07292 (2017)Hybrid integration: S. Mouradian, T. Schröder et al. Phys. Rev. X (2015)19
Quantum Networks with Solid State Quantum Emitters – Marko Loncar
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On-chip Diamond
NanophotonicNetwork
Lukin & LoncarSEM images: (a) resonator array with key parts (b) diamond nanobeamphotonic cavities with SiVcolor centers (c) waveguide support (d, e) diamond tapers for >98% fiber-coupling. (f) SiVfluorescence in the diamond waveguide is collected by optical fiber. (g) Optical fiber taper in contact with a diamond waveguide taper. [Burek ... Nature Comm. (2014)] 20
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Strain-Defined Quantum Emitters in
TMDCs
Silica postSingle Layer WSe2
Strain-defined quantum dot quantum emitter
Mete Atature & Marko Loncar
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Science & Education Community
Industrial & Venture Capital
Partners
Harvardinnovation lab
NewQuantum Partners
$120 round trip
College Network
PublicOutreach
IndustrialOutreach
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NanoDays2017
Pablo Jarillo-Herrero (MIT) "Welcome to Flatland! 2-D Materials
in the Quantum Age"
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CIQM YouTube Channel
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College Network Activities
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DHH Gallaudet students MandyHoughton and Brandt Marceauxvisit Horace Mann School for theDeaf and Hard of Hearing to talkabout their summer internships inquantum materials with Evelyn Hu.
Science demonstrator DanielRosenberg and Horace Mannstudents make liquid nitrogen icecream at Harvard.
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Success Stories in Technology Transfer
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Graphene applicationsJesus De la Fuente (CEO Graphenea)Tomas Palacios (MIT)
Sculpted diamondDaniel Twitchen (Element Six)Marko Loncar (Harvard)
NGX technologies !™
USB
Microcontroller
CustomPCB SensorArrayCharles Mackin (NGX)Tomas Palacios (MIT)
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Epicenter for Nanoresearch at Harvard:CENTER FOR NANOSCALE SYSTEMS
William L. WilsonExecutive Director
Robert WesterveltDirector
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Thank you!
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