Journal
NATURE COMMUNICATIONS
Volume 13, Issue 1, Pages -Publisher
NATURE PORTFOLIO
DOI: 10.1038/s41467-022-33676-0
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Funding
- National Research Foundation (NRF) Singapore, under the Competitive Research Programme Towards On-Chip Topological Quantum Devices [NRF-CRP21-2018-0001]
- Singapore Ministry of Education (MOE) Academic Research Fund Tier 3 grant [MOE2018-T3-1-002]
- US Department of Energy (DOE), Office of Science, Basic Energy Sciences [DE-SC0022216]
- National Energy Research Scientific Computing Center through DOE Grant [DE-AC02-05CH11231]
- Ministry of Science and Technology (MOST) in Taiwan [MOST 109-2112-M-001-014-MY3]
- SERB [SP/2021/1008/PH/SERB/008839]
- Singapore National Research Foundation (NRF) Fellowship [NRF-NRFF2017-11]
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In one-dimensional systems, electron interactions lead to the breakdown of Fermi liquid theory and the formation of a Tomonaga-Luttinger Liquid. Recent studies have shown the existence of this state in the helical edge states of quantum spin Hall insulators. The authors demonstrate that the many-body interactions in the helical Tomonaga-Luttinger Liquid of 1T'-WTe2 can be effectively controlled by the dielectric screening via the substrate.
In one-dimensional systems, electronic interactions lead to a breakdown of Fermi liquid theory and the formation of a Tomonaga Luttinger Liquid (TLL), as recently reported in the helical edge states of quantum spin Hall insulators. Here, the authors show that the many-body interactions in the helical TLL of 1T'- WTe2 can be effectively controlled by the dielectric screening via the substrate. In one-dimensional (1D) systems, electronic interactions lead to a breakdown of Fermi liquid theory and the formation of a Tomonaga-Luttinger Liquid (TLL). The strength of its many-body correlations can be quantified by a single dimensionless parameter, the Luttinger parameter K, characterising the competition between the electrons' kinetic and electrostatic energies. Recently, signatures of a TLL have been reported for the topological edge states of quantum spin Hall (QSH) insulators, strictly 1D electronic structures with linear (Dirac) dispersion and spin-momentum locking. Here we show that the many-body interactions in such helical Luttinger Liquid can be effectively controlled by the edge state's dielectric environment. This is reflected in a tunability of the Luttinger parameter K, distinct on different edges of the crystal, and extracted to high accuracy from the statistics of tunnelling spectra at tens of tunnelling points. The interplay of topology and many-body correlations in 1D helical systems has been suggested as a potential avenue towards realising non-Abelian parafermions.
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