Establishing the Platform of Quasi-one-dimensional Topological Insulators with Emergent Functionalities

This program aims at addressing some of the major challenges facing three-dimensional (3D) and 2D topological insulators (TIs), by establishing the physics platform and materials database of various quasi-1D topological materials with emergent functionalities. Our goals are: (1). design and optimization of quasi-1D TI candidates; (2). synthesis and characterization of the materials; (3). demonstration of phase transitions between different topological phases by strain and/or temperature; (4). the search for 2D TIs in atomically thin layers of quasi-1D materials.

Synergistic and iterative collaborations have been established among the five team members with strong and diverse expertise in theory and computation, materials synthesis, spin- and angle- resolved photoemission spectroscopy, nanofabrication and quantum transport, and neutron and x-ray scattering. Successful implementation of the program will actualize the potentials offered by quasi-1D materials in the realization and discovery of a variety of topological quantum phases including tuning their topological phase transitions. These advances will ultimately pave the way for the realization of fault-tolerant quantum computing and novel spintronic devices for next-generation information technology.

# Publications

Ideal weak topological insulator and protected helical saddle points

J. S. Oh, T. Xu, N. Dhale, S. Li, C. Lei, C. Yoon, W. Liu, J. Huang, H. Wu, M. Hashimoto, D. Lu, C. Jozwiak, A. Bostwick, E. Rotenberg, C. N. Lau, B. Lv, F. Zhang, R. J. Birgeneau, and M. Yi

11/7/2023

Synthesis, structure and canted antiferromagnetism of layered cobalt hydroxide sorbate

J. B. Lefton, W. Liu, C. McGuire, B. Lv, C. M. Brown, R. A. Klein, and T. Runčevski

11/1/2023

The pairing symmetry in quasi-one-dimensional superconductor Rb2 Mo3 As3

Ž. Gosar, T. Arh, K. Jaksetič, A. Zorko, W. Liu, H. Wu, C. Wang, H. Luetkens, B. Lv, and D. Arčon

10/1/2023

Gapless spin excitations in the superconducting state of a quasi-one-dimensional spin-triplet superconductor

K. M. Taddei, B. Lei, M. A. Susner, H. Zhai, T. J. Bullard, L. D. Sanjeewa, Q. Zheng, A. S. Sefat, S. Chi, C. dela Cruz, D. J. Singh, and B. Lv

5/30/2023

Geometric deep optical sensing

S. Yuan, C. Ma, E. Fetaya, T. Mueller, D. Naveh, F. Zhang, and F. Xia

3/17/2023

Magnetism and charge density wave order in kagome FeGe

X. Teng, J. S. Oh, H. Tan, L. Chen, J. Huang, B. Gao, J. Yin, J. Chu, M. Hashimoto, D. Lu, C. Jozwiak, A. Bostwick, E. Rotenberg, G. E. Granroth, B. Yan, R. J. Birgeneau, P. Dai, and M. Yi

3/13/2023

Evidence for Dirac flat band superconductivity enabled by quantum geometry

H. Tian, X. Gao, Y. Zhang, S. Che, T. Xu, P. Cheung, K. Watanabe, T. Taniguchi, M. Randeria, F. Zhang, C. N. Lau, and M. W. Bockrath

2/15/2023

Multiple-Intercalation Stages and Universal

*T*_{c}Enhancement through Polar Organic Species in Electron-Doped 1T-SnSe_{2}H. Wu, S. Li, W. Liu, and B. Lv

2/15/2023

A Three-Stage Magnetic Phase Transition Revealed in Ultrahigh-Quality van der Waals Bulk Magnet CrSBr

W. Liu, X. Guo, J. Schwartz, H. Xie, N. U. Dhale, S. H. Sung, A. L. N. Kondusamy, X. Wang, H. Zhao, D. Berman, R. Hovden, L. Zhao, and B. Lv

9/23/2022

Impact of Electric Field Disorder on Broken-Symmetry States in Ultraclean Bilayer Graphene

F. R. Geisenhof, F. Winterer, A. M. Seiler, J. Lenz, F. Zhang, and R. T. Weitz

9/16/2022

Quantum cascade of correlated phases in trigonally warped bilayer graphene

A. M. Seiler, F. R. Geisenhof, F. Winterer, K. Watanabe, T. Taniguchi, T. Xu, F. Zhang, and R. T. Weitz

8/10/2022

Uncovering Topological Edge States in Twisted Bilayer Graphene

M. Fortin-Deschênes, R. Pu, Y. Zhou, C. Ma, P. Cheung, K. Watanabe, T. Taniguchi, F. Zhang, X. Du, and F. Xia

7/28/2022

Evidence of a room-temperature quantum spin Hall edge state in a higher-order topological insulator

N. Shumiya, M. S. Hossain, J. Yin, Z. Wang, M. Litskevich, C. Yoon, Y. Li, Y. Yang, Y. Jiang, G. Cheng, Y. Lin, Q. Zhang, Z. Cheng, T. A. Cochran, D. Multer, X. P. Yang, B. Casas, T. Chang, T. Neupert, Z. Yuan, S. Jia, H. Lin, N. Yao, L. Balicas, F. Zhang, Y. Yao, and M. Z. Hasan

7/14/2022

Intelligent infrared sensing enabled by tunable moiré quantum geometry

C. Ma, S. Yuan, P. Cheung, K. Watanabe, T. Taniguchi, F. Zhang, and F. Xia

4/13/2022

Nonsymmorphic symmetry-protected band crossings in a square-net metal PtPb4

H. Wu, A. M. Hallas, X. Cai, J. Huang, J. S. Oh, V. Loganathan, A. Weiland, G. T. McCandless, J. Y. Chan, S. Mo, D. Lu, M. Hashimoto, J. Denlinger, R. J. Birgeneau, A. H. Nevidomskyy, G. Li, E. Morosan, and M. Yi

3/18/2022

Reproducibility in the fabrication and physics of moiré materials

C. N. Lau, M. W. Bockrath, K. F. Mak, and F. Zhang

2/2/2022

New layered quaternary BaCu6Sn2As4−x and BaCu6Sn2P4−x phases: Crystal growth and physical properties

H. Wu, S. Li, X. Wang, S. Kwon, W. Liu, G. A. Ofenstein, M. J. Kim, and B. Lv

2/1/2022

Gate-Tunable Transport in Quasi-One-Dimensional α-Bi

_{4}I_{4}Field Effect TransistorsY. Liu, R. Chen, Z. Zhang, M. Bockrath, C. N. Lau, Y. Zhou, C. Yoon, S. Li, X. Liu, N. Dhale, B. Lv, F. Zhang, K. Watanabe, T. Taniguchi, J. Huang, M. Yi, J. S. Oh, and R. J. Birgeneau

1/25/2022

Quantum anomalous Hall octet driven by orbital magnetism in bilayer graphene

F. R. Geisenhof, F. Winterer, A. M. Seiler, J. Lenz, T. Xu, F. Zhang, and R. T. Weitz

10/6/2021

Transport anomalies in the layered compound BaPt4Se6

S. Li, Y. Zhang, H. Wu, H. Zhai, W. Liu, D. P. Petit, J. S. Oh, J. Denlinger, G. T. McCandless, J. Y. Chan, R. J. Birgeneau, G. Li, M. Yi, and B. Lv

9/23/2021

Room-Temperature Topological Phase Transition in Quasi-One-Dimensional Material
B i 4 I 4

J. Huang, S. Li, C. Yoon, J. S. Oh, H. Wu, X. Liu, N. Dhale, Y. Zhou, Y. Guo, Y. Zhang, M. Hashimoto, D. Lu, J. Denlinger, X. Wang, C. N. Lau, R. J. Birgeneau, F. Zhang, B. Lv, and M. Yi

8/24/2021

New Verbeekite-type polymorphic phase and rich phase diagram in the
PdSe 2 − x Te x
system

W. Liu, M. R. Osanloo, X. Wang, S. Li, N. Dhale, H. Wu, M. L. Van de Put, S. Tiwari, W. G. Vandenberghe, and B. Lv

7/22/2021

Engineering symmetry breaking in 2D layered materials

L. Du, T. Hasan, A. Castellanos-Gomez, G. Liu, Y. Yao, C. N. Lau, and Z. Sun

2/8/2021

Enhanced superconductivity in the Se-substituted 1T-
PdTe 2

W. Liu, S. Li, H. Wu, N. Dhale, P. Koirala, and B. Lv

1/29/2021

Canted antiferromagnetism in the quasi-one-dimensional iron chalcogenide
BaFe 2 Se 4

X. Liu, K. M. Taddei, S. Li, W. Liu, N. Dhale, R. Kadado, D. Berman, C. D. Cruz, and B. Lv

11/4/2020

Line up for high-temperature Majoranas

Z. Bao, and F. Zhang

8/1/2020

Novel Polymorphic Phase of BaCu

_{2}As_{2}: Impact of Flux for New Phase Formation in Crystal GrowthH. Wu, S. Li, Z. Wu, X. Wang, G. A. Ofenstein, S. Kwon, M. J. Kim, P. C. W. Chu, and B. Lv

7/23/2020

Moiré Band Topology in Twisted Bilayer Graphene

C. Ma, Q. Wang, S. Mills, X. Chen, B. Deng, S. Yuan, C. Li, K. Watanabe, T. Taniguchi, X. Du, F. Zhang, and F. Xia

7/21/2020

Zero-bias conductance peak in Dirac semimetal-superconductor devices

W. Yu, R. Haenel, M. A. Rodriguez, S. R. Lee, F. Zhang, M. Franz, D. I. Pikulin, and W. Pan

7/1/2020

Author Correction: Unconventional valley-dependent optical selection rules and landau level mixing in bilayer graphene

L. Ju, L. Wang, X. Li, S. Moon, M. Ozerov, Z. Lu, T. Taniguchi, K. Watanabe, E. Mueller, F. Zhang, D. Smirnov, F. Rana, and P. L. McEuen

6/24/2020

Strong mid-infrared photoresponse in small-twist-angle bilayer graphene

B. Deng, C. Ma, Q. Wang, S. Yuan, K. Watanabe, T. Taniguchi, F. Zhang, and F. Xia

6/1/2020

Crystal Structure and Electronic Properties of New Compound Zr

_{6.5}Pt_{6}Se_{19}H. Wu, H. Zhai, S. Li, M. Sorolla, G. T. McCandless, D. P. Petit, J. Y. Chan, and B. Lv

5/27/2020

Emergent quantum materials

C. N. Lau, F. Xia, and L. Cao

5/1/2020

Composite Dirac semimetals

Z. Zhu, Z. Yu, W. Wu, L. Zhang, W. Zhang, F. Zhang, and S. A. Yang

10/11/2019

View All Publications

# Research Highlights

Evidence of a Room-temperature Quantum Spin Hall Edge State in a Higher-order Topological Insulator

Fan Zhang (University of Texas at Dallas)

2/16/2023

Discovery of Tunable Quantum Anomalous Hall Octet

Fan Zhang (University of Texas at Dallas)

2/16/2023

New Topology & Tunable Superconductivity in a-Bi4I4

R.J. Birgeneau (Berkeley), C. N. Lau (Ohio St.),B. Lv, F. Zhang (UT-Dallas), M. Yi (Rice)

11/16/2021

Special Achievements of PI Zhang’s Students

Fan Zhang, the University of Texas at Dallas

2/16/2023

View All Highlights