One-dimensional Luttinger liquids in a two-dimensional moiré lattice
The Luttinger liquid (LL) model of one-dimensional (1D) electronic systems provides a powerful tool for understanding strongly correlated physics, including phenomena such as spin–charge separation. Substantial theoretical efforts have attempted to extend the LL phenomenology to two dimensions, espe...
| Main Authors: | , , , , , , , , , , , , , , , |
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| Format: | Journal article |
| Language: | English |
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Springer Nature
2022
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| _version_ | 1826308653997621248 |
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| author | Wang, P Yu, G Kwan, YH Jia, Y Lei, S Klemenz, S Cevallos, FA Singha, R Devakul, T Watanabe, K Taniguchi, T Sondhi, SL Cava, RJ Schoop, LM Parameswaran, SA Wu, S |
| author_facet | Wang, P Yu, G Kwan, YH Jia, Y Lei, S Klemenz, S Cevallos, FA Singha, R Devakul, T Watanabe, K Taniguchi, T Sondhi, SL Cava, RJ Schoop, LM Parameswaran, SA Wu, S |
| author_sort | Wang, P |
| collection | OXFORD |
| description | The Luttinger liquid (LL) model of one-dimensional (1D) electronic systems provides a powerful tool for understanding strongly correlated physics, including phenomena such as spin–charge separation. Substantial theoretical efforts have attempted to extend the LL phenomenology to two dimensions, especially in models of closely packed arrays of 1D quantum wires, each being described as a LL. Such coupled-wire models have been successfully used to construct two-dimensional (2D) anisotropic non-Fermi liquids, quantum Hall states, topological phases and quantum spin liquids. However, an experimental demonstration of high-quality arrays of 1D LLs suitable for realizing these models remains absent. Here we report the experimental realization of 2D arrays of 1D LLs with crystalline quality in a moiré superlattice made of twisted bilayer tungsten ditelluride (tWTe2). Originating from the anisotropic lattice of the monolayer, the moiré pattern of tWTe2 hosts identical, parallel 1D electronic channels, separated by a fixed nanoscale distance, which is tuneable by the interlayer twist angle. At a twist angle of approximately 5 degrees, we find that hole-doped tWTe2 exhibits exceptionally large transport anisotropy with a resistance ratio of around 1,000 between two orthogonal in-plane directions. The across-wire conductance exhibits power-law scaling behaviours, consistent with the formation of a 2D anisotropic phase that resembles an array of LLs. Our results open the door for realizing a variety of correlated and topological quantum phases based on coupled-wire models and LL physics. |
| first_indexed | 2024-03-07T07:22:31Z |
| format | Journal article |
| id | oxford-uuid:33fd5d03-03bc-4b6b-8bb4-0a520820ffc5 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T07:22:31Z |
| publishDate | 2022 |
| publisher | Springer Nature |
| record_format | dspace |
| spelling | oxford-uuid:33fd5d03-03bc-4b6b-8bb4-0a520820ffc52022-11-04T10:42:58ZOne-dimensional Luttinger liquids in a two-dimensional moiré latticeJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:33fd5d03-03bc-4b6b-8bb4-0a520820ffc5EnglishSymplectic ElementsSpringer Nature2022Wang, PYu, GKwan, YHJia, YLei, SKlemenz, SCevallos, FASingha, RDevakul, TWatanabe, KTaniguchi, TSondhi, SLCava, RJSchoop, LMParameswaran, SAWu, SThe Luttinger liquid (LL) model of one-dimensional (1D) electronic systems provides a powerful tool for understanding strongly correlated physics, including phenomena such as spin–charge separation. Substantial theoretical efforts have attempted to extend the LL phenomenology to two dimensions, especially in models of closely packed arrays of 1D quantum wires, each being described as a LL. Such coupled-wire models have been successfully used to construct two-dimensional (2D) anisotropic non-Fermi liquids, quantum Hall states, topological phases and quantum spin liquids. However, an experimental demonstration of high-quality arrays of 1D LLs suitable for realizing these models remains absent. Here we report the experimental realization of 2D arrays of 1D LLs with crystalline quality in a moiré superlattice made of twisted bilayer tungsten ditelluride (tWTe2). Originating from the anisotropic lattice of the monolayer, the moiré pattern of tWTe2 hosts identical, parallel 1D electronic channels, separated by a fixed nanoscale distance, which is tuneable by the interlayer twist angle. At a twist angle of approximately 5 degrees, we find that hole-doped tWTe2 exhibits exceptionally large transport anisotropy with a resistance ratio of around 1,000 between two orthogonal in-plane directions. The across-wire conductance exhibits power-law scaling behaviours, consistent with the formation of a 2D anisotropic phase that resembles an array of LLs. Our results open the door for realizing a variety of correlated and topological quantum phases based on coupled-wire models and LL physics. |
| spellingShingle | Wang, P Yu, G Kwan, YH Jia, Y Lei, S Klemenz, S Cevallos, FA Singha, R Devakul, T Watanabe, K Taniguchi, T Sondhi, SL Cava, RJ Schoop, LM Parameswaran, SA Wu, S One-dimensional Luttinger liquids in a two-dimensional moiré lattice |
| title | One-dimensional Luttinger liquids in a two-dimensional moiré lattice |
| title_full | One-dimensional Luttinger liquids in a two-dimensional moiré lattice |
| title_fullStr | One-dimensional Luttinger liquids in a two-dimensional moiré lattice |
| title_full_unstemmed | One-dimensional Luttinger liquids in a two-dimensional moiré lattice |
| title_short | One-dimensional Luttinger liquids in a two-dimensional moiré lattice |
| title_sort | one dimensional luttinger liquids in a two dimensional moire lattice |
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