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

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

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

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)

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

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

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

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.

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

Thank you!

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