An ultrafast symmetry switch in a Weyl semimetal

Sie, Edbert J.; Nyby, Clara M.; Pemmaraju, C. D.; Park, Su Ji; Shen, Xiaozhe; Yang, Jie; Hoffmann, Matthias C.; Ofori-Okai, B. K.; Li, Renkai; Reid, Alexander H.; Weathersby, Stephen; Mannebach, Ehren; Finney, Nathan; Rhodes, Daniel; Chenet, Daniel; Antony, Abhinandan; Balicas, Luis; Hone, James; Devereaux, Thomas P.; Heinz, Tony F.; Wang, Xijie; Lindenberg, Aaron M.

doi:10.1038/s41586-018-0809-4

An ultrafast symmetry switch in a Weyl semimetal

Journal Article · Wed Jan 02 00:00:00 EST 2019 · Nature (London)

DOI:https://doi.org/10.1038/s41586-018-0809-4· OSTI ID:1492730

Sie, Edbert J. ^[1]; Nyby, Clara M. ^[2]; Pemmaraju, C. D. ^[3]; Park, Su Ji ^[3]; Shen, Xiaozhe ^[4]; Yang, Jie ^[5]; Hoffmann, Matthias C. ^[4]; Ofori-Okai, B. K. ^[6]; Li, Renkai ^[4]; Reid, Alexander H. ^[4]; Weathersby, Stephen ^[4]; Mannebach, Ehren ^[7]; Finney, Nathan ^[8]; Rhodes, Daniel ^[9]; Chenet, Daniel ^[8]; Antony, Abhinandan ^[8]; Balicas, Luis ^[9]; Hone, James ^[8]; Devereaux, Thomas P. ^[1]; Heinz, Tony F. ^[10] more »

Stanford Univ., CA (United States). Geballe Lab. for Advanced Materials; SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Institute for Materials and Energy Science (SIMES)
Stanford Univ., CA (United States). Dept. of Chemistry
SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Institute for Materials and Energy Science (SIMES)
SLAC National Accelerator Lab., Menlo Park, CA (United States)
SLAC National Accelerator Lab., Menlo Park, CA (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States). Photon Ultrafast Laser Science and Engineering Inst. (PULSE)
SLAC National Accelerator Lab., Menlo Park, CA (United States); Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Stanford Univ., CA (United States). Dept. of Materials Science and Engineering
Columbia Univ., New York, NY (United States). Dept. of Mechanical Engineering
Florida State Univ., Tallahassee, FL (United States). National High Magnetic Field Lab. (MagLab) and Dept. of Physics
SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Institute for Materials and Energy Science (SIMES); SLAC National Accelerator Lab., Menlo Park, CA (United States). Photon Ultrafast Laser Science and Engineering Inst. (PULSE); Stanford Univ., CA (United States). Dept. of Applied Physics
SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Institute for Materials and Energy Science (SIMES); SLAC National Accelerator Lab., Menlo Park, CA (United States). Photon Ultrafast Laser Science and Engineering Inst. (PULSE); Stanford Univ., CA (United States). Dept. of Materials Science and Engineering

Topological quantum materials exhibit fascinating properties with important applications for dissipationless electronics and fault-tolerant quantum computers. Manipulating the topological invariants in these materials would allow the development of topological switching applications analogous to switching of transistors. Lattice strain provides the most natural means of tuning these topological invariants because it directly modifies the electron–ion interactions and potentially alters the underlying crystalline symmetry on which the topological properties depend. However, conventional means of applying strain through heteroepitaxial lattice mismatch and dislocations are not extendable to controllable time-varying protocols, which are required in transistors. Integration into a functional device requires the ability to go beyond the robust, topologically protected properties of materials and to manipulate the topology at high speeds. Here in this paper we use crystallographic measurements by relativistic electron diffraction to demonstrate that terahertz light pulses can be used to induce terahertz-frequency interlayer shear strain with large strain amplitude in the Weyl semimetal WTe₂, leading to a topologically distinct metastable phase. Separate nonlinear optical measurements indicate that this transition is associated with a symmetry change to a centrosymmetric, topologically trivial phase. We further show that such shear strain provides an ultrafast, energy-efficient way of inducing robust, well separated Weyl points or of annihilating all Weyl points of opposite chirality. This work demonstrates possibilities for ultrafast manipulation of the topological properties of solids and for the development of a topological switch operating at terahertz frequencies.

View Accepted Manuscript (DOE)

Research Organization:: SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC02-76SF00515

OSTI ID:: 1492730

Journal Information:: Nature (London), Journal Name: Nature (London) Journal Issue: 7737 Vol. 565; ISSN 0028-0836

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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