SHINES Mission: To explore the interplay of spin, charge, and heat and to control the transport of spin and energy for achieving significantly higher energy efficiencies in nanoscale electronic devices

Spins and Heat In Nanoscale Electronic Systems (SHINES)

SHINES Website: http://efrcshines.ucr.edu/

2017 EFRC PI Meeting

SHINES Organization

Three themes Theme 1: Pure Spin Currents in Metals and Insulators Theme 2: Phonon/Magnon Transport and Phonon/Magnon Engineering in Nanostructured Materials Theme 3: SOC Heterostructures and Highly Correlated Spin Materials

Scientific Advisory Committee

D. Dahlberg (UMN) C. Dame (UCB) M. Stiles (NIST) J. Sun (IBM) S.F. Zhang (UA)

Topological Spintronics (1)

Topological spin Seebeck effect (SSE) Spin-orbit torque with topological insulators (TI , T3)

Nat. Comm. 7, 11458 (2016) by Shi & MacDonald groups

SSE from spin-momentum locked surface states

1st demonstration of greatly enhanced SSE from TI surface states

(TI)

YIG

Nat Nano 11, 352 (2016) by Wang group

1st demonstration of SOT switching from unbalanced TI surfaces

Clear demonstration of more efficient SOT from TI (SmB6)

Data from Chien group

Topological Spintronics (2)

Induced ferromagnetism in topological insulator (P3) Topological insulator for spin pumping (T1 & P4)

Induced magnetic interface

Above 400 K induced ferromagnetism

Science Advances (June, 2017) by Shi and Chen groups

Andreev reflection spectroscopy Spin polarization of carriers in TI

1st demonstration of induced ferromagnetism > 400 K in TI via proximity

Collaborative work of Mingzhong Wu, Ruqian Wu and Chien groups

Topological Kondo insulator (SmB6) film as spin detector

Temperature dependence of spin pumping signal indicates the role of spin-momentum locked surface states in SmB6 films

Magnon Condensate & Spin Superfluidity

Spin Seebeck induced auto-oscillation Spin superfluidity in graphene CAFMI (T2)

Accepted by Nat Comm Work by Krivorotov & M.Z. Wu groups

1st demo of thermally driven auto-oscillation (magnon condensate)

Toward spin superfluidity in easy-plane FM

Work by Krivorotov, Lake, and MacDonald groups

Evidence of spin superfluidity

hBN/graphene/hBN with multiple top gates

Non-local signal through CAFMI

n=0 state: canted antiferromagnetic insulator

Work by Lau, Lake, and MacDonald groups

• 1st demonstration of spin transport in CAFMI over long distance • Evidence of spin supercurrent across quantum Hall CAFMI

Center Activities

• Center-wide collaborative projects run by postdocs/students (10)

• Mandatory monthly collaborative project reviews (5 projects/month)

• Mandatory monthly All-Hands meetings (3 presentations/month)

• Weekly meetings at UCR and open to all SHINES participants

• Bi-monthly progress reports

• Annual meetings

• “Spins and Heat” workshop (2017)

SHINES Talks

T1 - EXPLOITING SPIN-CHIRAL TOPOLOGICAL SURFACE STATES IN KONDO INSULATOR SMB6 THIN FILMS [EFRC – SHINES] Yufan Li1, Tao Liu2, Mingzhong Wu2, C. L. Chien1 1Johns Hopkins University; 2Colorado State University

T2 - LONG-DISTANCE SPIN TRANSPORT THROUGH A GRAPHENE QUANTUM HALL ANTIFERROMAGNET [EFRC – SHINES] Petr Stepanov1,2, Shi Che1,2, Dmitry Shcherbakov1,2, Jiawei Yang1,2, Kevin Thilahar1, Greyson Voigt1, Marc W. Bockrath1,2, Dmitry Smirnov3, Kenji Watanabe4, Takashi Taniguchi4, Roger K. Lake5, Yafis Barlas1, Allan H. MacDonald5, Chun Ning Lau1,2 1 University of California, Riverside; 2The Ohio State University; 3National High Magnetic Field Laboratory, Tallahassee; 4National Institute for Materials Science, Japan; 5University of California, Riverside; University of Texas at Austin

T3 - TOPOLOGICAL SPINTRONIC HETEROSTRUCTURES AND THEIR PROPERTIES – EXAMPLES OF THE COLLABORATIVE RESEARCH IN SHINES [EFRC – SHINES] Kang L. Wang1, Xiaoqin(Elaine) Li2, Allan MacDonald2 1University of California, Los Angele; 2University of Texas at Austin

SHINES Posters P1 - ANTIFERROMAGNETIC SPINTRONICS [EFRC – SHINES] Weiwei Lin1, Zhong Shi2, Bochao Li3, Xin Ma4, C. L. Chien1, Jing Shi2, Tingyong Chen3, and Xiaoqin Li4 1 Johns Hopkins University; 2University of California, Riverside; 3Arizona State University; 4 UT Austin

P2 - SPIN - PHONON COUPLING IN NIO: UV AND VISIBLE RAMAN SPECTROSCOPY INVESTIGATION [EFRC – SHINES] Ece Aytan1, Monica Lacerda1,2, Fariborz Kargar1, Junxue Li1, Bishwajit Debnath1, Roger Lake1, Jing Shi1, Alexander A. Balandin1 1University of California, Riverside; 2Universidade Federal do Rio de Janeiro, Brazil

P3 – ABOVE 400 K PERPENDICULAR MAGNETIC PHASE IN TOPOLOGICAL INSULATOR SURFACE STATES INDUCED BY PROXIMITY COUPLING [EFRC – SHINES] Chi Tang1, Cui-Zu Chang2,3, Gejian Zhao4, Yawen Liu1, Zilong Jiang1, Chao-Xing Liu3, Martha R. McCartney4, David J. Smith4, Tingyong Chen4, Jagadeesh S. Moodera2, and Jing Shi1 1University of California, Riverside; 2Massachusetts Institute of Technology; 3PSU; 4Arizona State University

P4 - NON-TRIVIAL TOPOLOGICAL SURFACE STATES IN SMB6 THIN FILMS [EFRC – SHINES] Tao Liu1, Yufan Li2, Lei Gu3, Junjia Ding4, Houchen Chang1, P. A. Praveen Janantha1, Valentyn Novosad4, Axel Hoffmann4, Ruqian Wu3, C. L. Chien2, and Mingzhong Wu1 1Colorado State University; 2Johns Hopkins University; 3University of California, Irvine; 4ANL

P5 - MAGNONIC HOLOGRAPHIC IMAGING OF MAGNETIC MICROSTRUCTURES [EFRC – SHINES] D. Gutierrez1, H. Chiang1, T. Bhowmick1, A.D. Volodchenkov1, M. Ranjbar1, G. Liu1, C. Jiang1, C. Warren1, M. Balinskiy1, Y. Khivintsev2,3, Y. Filimonov2,3, J. Garay4, R. Lake1, A.A. Balandin1, and A. Khitun1 1UCR; 2Kotelnikov Inst. of Radioeng. and Electronics of RSA, Russia; 3Saratov State U., Russia;4UCSD