Berry Curvature-Driven Valley Nernst Effect in Monolayer WSe<sub>2</sub>

The Berry curvature in a Dirac cone causes anomalous transport phenomena, including anomalous Hall, anomalous Nernst, and Valley Hall effects. Detecting the Berry curvature in a 2D transition metal dichalcogenide (TMD) layer requires breaking time-reversal symmetry to create a population imbalance between the K<sup>+</sup> and K<sup>-</sup> valleys. Direct observation and control of valley polarization in a 2D TMD layer remain challenging, especially for practical applications. Here, we present the first experimental verification of the Berry curvature-driven valley Nernst effect (VNE) in interlayer TMDs, focusing on the monolayer (ML) WSe<sub>2</sub> in a Pt/YIG bilayer structure. Experiments and calculations show that our VNE signals result from the high Berry curvature of the ML WSe<sub>2</sub> layer. This opens up a new way to generate spin- and valley-current-based thermoelectric devices.

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Publication Details

Journal
Nano Letters
Published
2025-04-09
DOI
https://doi.org/10.1021/acs.nanolett.5c00194
Citations
3
Primary Topic
2D Materials and Applications
Type
article
Field-Weighted Citation Impact
1.55
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article

Berry Curvature-Driven Valley Nernst Effect in Monolayer WSe2

Takashi Kikkawa, Jung‐Min Cho, Min‐Sung Kang, No‐Won Park et al.
3 citations
Nano Letters
2D Materials and Applications
1.55
article

Berry Curvature-Driven Valley Nernst Effect in Monolayer WSe2

Takashi Kikkawa, Jung‐Min Cho, Min‐Sung Kang, No‐Won Park, Eiji Saitoh, Jae Won Choi, Gil‐Sung Kim, Chinh Tam Le, Young‐Gui Yoon, Won‐Yong Lee, Yong Soo Kim, Sang‐Kwon Lee, Yun‐Ho Kim
article en
3 citations

Abstract

The Berry curvature in a Dirac cone causes anomalous transport phenomena, including anomalous Hall, anomalous Nernst, and Valley Hall effects. Detecting the Berry curvature in a 2D transition metal dichalcogenide (TMD) layer requires breaking time-reversal symmetry to create a population imbalance between the K<sup>+</sup> and K<sup>-</sup> valleys. Direct observation and control of valley polarization in a 2D TMD layer remain challenging, especially for practical applications. Here, we present the first experimental verification of the Berry curvature-driven valley Nernst effect (VNE) in interlayer TMDs, focusing on the monolayer (ML) WSe<sub>2</sub> in a Pt/YIG bilayer structure. Experiments and calculations show that our VNE signals result from the high Berry curvature of the ML WSe<sub>2</sub> layer. This opens up a new way to generate spin- and valley-current-based thermoelectric devices.

Nano LettersVol. 25(16)
Tohoku University (JP), University of Ulsan (KR), Berry (India) (IN), Institute for Materials Research, Tohoku University, Chung-Ang University (KR), The University of Tokyo (JP)
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Openalex Percentile: Top 19%
2D Materials and Applications
1.55
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Berry Curvature-Driven Valley Nernst Effect in Monolayer WSe<sub>2</sub> — Takashi Kikkawa, Jung‐Min Cho, et al. · Nano Letters (2025) | TGRS Research Map | TGRS