Journal
ACS NANO
Volume 13, Issue 6, Pages 7231-7240Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.9b02870
Keywords
charge-density-wave effects; van der Waals materials; voltage switching; resistive switching; low-frequency noise; 1T-TaS2; normal metallic phase; Joule heating
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Funding
- National Science Foundation (NSF) through the Emerging Frontiers of Research Initiative (EFRI) 2-DARE project: Novel Switching Phenomena in Atomic MX2 Heterostructures for Multifunctional Applications [NSF EFRI-1433395]
- UC -National Laboratory Collaborative Research and Training Program - University of California Research Initiatives [LFR-17-477237]
- Center for Terahertz Research and Applications project within the International Research Agendas program of the Foundation for Polish Science - European Union under the European Regional Development Fund
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We report on switching among three charge-density-wave phases, commensurate, nearly commensurate, incommensurate, and the high-temperature normal metallic phase in thin-film 1T-TaS2 devices induced by application of an in-plane bias voltage. The switching among all phases has been achieved over a wide temperature range, from 77 to 400 K. The low-frequency electronic noise spectroscopy has been used as an effective tool for monitoring the transitions, particularly the switching from the incommensurate charge-density-wave phase to the normal metal phase. The noise spectral density exhibits sharp increases at the phase transition points, which correspond to the step-like changes in resistivity. Assignment of the phases is consistent with low-field resistivity measurements over the temperature range from 77 to 600 K. Analysis of the experimental data and calculations of heat dissipation indicate that Joule heating plays a dominant role in the voltage induced transitions in the 1T-TaS2 devices on Si/SiO2 substrates, contrary to some recent claims. The possibility of the bias-voltage switching among four different phases of 1T-TaS2 is a promising step toward nanoscale device applications. The results also demonstrate the potential of noise spectroscopy for investigating and identifying phase transitions in the materials.
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