Topological Nernst Effect of the Two-Dimensional Skyrmion Lattice

Hirschberger, Max; Spitz, Leonie; Nomoto, Takuya; Kurumaji, Takashi; Gao, Shang; Masell, Jan; Nakajima, Tsuyoshi; Kikkawa, Akiko; Yamasaki, Y.; Sagayama, Hajime; Nakao, Hironori; Taguchi, Y.; Arita, Ryotaro; Arima, Taka‐hisa; Tokura, Y.

doi:10.1103/physrevlett.125.076602

Cited by 88 publications

(61 citation statements)

References 67 publications

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“…Since there have been no preceding reports on the Nernst effect caused by fluctuating SSC, we can only refer to systems in which the static scenario is relevant. The maximum value of α χ xy =T ≈ 1.6 (37) and ≈2.1 (35), indicating that the Nernst conductivity from fluctuating SSC can be as large as the signal caused by long-range topologically nontrivial magnetic structures.…”

Section: Physicsmentioning

confidence: 98%

Large Hall and Nernst responses from thermally induced spin chirality in a spin-trimer ferromagnet

Kolincio

Hirschberger

Masell

et al. 2021

Proc. Natl. Acad. Sci. U.S.A.

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The long-range order of noncoplanar magnetic textures with scalar spin chirality (SSC) can couple to conduction electrons to produce an additional (termed geometrical or topological) Hall effect. One such example is the Hall effect in the skyrmion lattice state with quantized SSC. An alternative route to attain a finite SSC is via the spin canting caused by thermal fluctuations in the vicinity of the ferromagnetic ordering transition. Here, we report that for a highly conducting ferromagnet with a two-dimensional array of spin trimers, the thermally generated SSC can give rise to a gigantic geometrical Hall conductivity even larger than the intrinsic anomalous Hall conductivity of the ground state. We also demonstrate that the SSC induced by thermal fluctuations leads to a strong response in the Nernst effect. A comparison of the sign and magnitude of fluctuation–Nernst and Hall responses in fundamental units indicates the need for a momentum–space picture to model these thermally induced signals.

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Section: Physicsmentioning

confidence: 98%

Large Hall and Nernst responses from thermally induced spin chirality in a spin-trimer ferromagnet

Kolincio

Hirschberger

Masell

et al. 2021

Proc. Natl. Acad. Sci. U.S.A.

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“…Thermoelectrical transport can provide additional information than electrical transport, as it is usually more sensitive to the Berry curvature near the Fermi level [29]. As a thermoelectrical counterpart of the UAHE, the unconventional contribution to the anomalous Nernst effect (UANE) has only been reported in few systems [20,21,[30][31][32]. Linked to each other by the Mott relation [31], the observation of a large UAHE, however, does not guarantee a large UANE [30,33].…”

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confidence: 99%

Unconventional Transverse Transport above and below the Magnetic Transition Temperature in Weyl Semimetal EuCd2As2

Das

et al. 2021

Phys. Rev. Lett.

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“…The widely adopted Mott's relation [62,63,67] is useful in estimating the thermopower in a deep-band conducting regime, but cannot help us obtain the value of S m , by essentially using a linear function of carrier energy to approximate the hyperbolic tangent function, [67] which is especially inaccurate around the extreme points.…”

Section: Methodsmentioning

confidence: 99%

“…[51,61] It is also challenging to study the thermoelectric parameters of single carbon nanotubes at different Fermi levels. Some researchers have used the Mott's relation to obtain the thermopower, [62,63] and some are estimating the electrical conductivity and thermopower by College of Engineering, State University of New York Polytechnic Institute, Albany, NY, 12203, USA. *E-mail: tangs1@sunypoly.edu (S. Tang) using a constant relaxation time approximation or by only considering the acoustic phonon scattering, [64][65][66] despite of the significant deviation from the real values.…”

Section: Introductionmentioning

confidence: 99%

Carbon Nanotubes for Active Refrigeration and Cooling in Micro and Mesoscale Systems

Tang¹

2021

Eng. Sci.

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With the development of micro and mesoscale electronics, photonics and optoelectronics, the heat management in such small scales are becoming important. In several emergent areas such as quantum computing and communication, satellite controlling and sensing, the overall refrigeration or cooling rate is having a priority over the energy consumption efficiency. Beyond the passive heat draining, active solid-state refrigeration and cooling based on the Peltier effect have been attractive. We are here suggesting the materials system of carbon nanotubes. By incorporating the energy sensitivity of transport into the thermopower investigation, we have found that the active refrigeration and cooling rates are better than or as least similar to the thermal conductivity of commonly used functional metals, especially at and above the room temperature. The performance is also robust against the fluctuation of band gap introduced during the batch synthesis of carbon nanotubes. Furthermore, the p-and n-type regions have similar performance in thermoelectric refrigeration and cooling, which is providing convenience for the ultimate device design and manufacturing.

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Topological Nernst Effect of the Two-Dimensional Skyrmion Lattice

Cited by 88 publications

References 67 publications

Large Hall and Nernst responses from thermally induced spin chirality in a spin-trimer ferromagnet

Large Hall and Nernst responses from thermally induced spin chirality in a spin-trimer ferromagnet

Unconventional Transverse Transport above and below the Magnetic Transition Temperature in Weyl Semimetal EuCd2As2

Carbon Nanotubes for Active Refrigeration and Cooling in Micro and Mesoscale Systems

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