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- W3140590924 abstract "The in-plane phonon-drag thermopower $S^g$, diffusion thermopower $S^d$ and the power factor $PF$ are theoretically investigated in twisted bilayer graphene (tBLG) as a function of twist angle $theta$, temperature $T$ and electron density $n_s$ in the region of low $T$ (1-20 K). As $theta$ approaches magic angle $theta_m$, the $S^g$ and $S^d$ are found to be strongly enhanced, which is manifestation of great suppression of Fermi velocity ${nu_F}^*$ of electrons in moire flat band near $theta_m$. This enhancement decreases with increasing $theta$ and $T$. In the Bloch- Gruneisen (BG) regime, it is found that $S^g sim {nu_F}^{* -2}$, $T^3$ and ${n_s}^{-1/2}$. As $T$ increases, the exponent $delta$ in $S^g sim T^delta$, changes from 3 to nearly zero and a maximum $S^g$ value of $sim$ 10 mV/K at $sim$ 20 K is estimated. $S^g$ is larger (smaller) for smaller $n_s$ in low (high) temperature region. On the other hand, $S^d$, taken to be governed by Mott formula, $sim {nu_F}^{* -1}$, $T$ and ${n_s}^{-1/2}$ and $S^d<<S^g$ for $T > sim$ 2 K. The power factor $PF$ is also found to be strongly $theta$ dependent and very much enhanced. Consequently, possibility of a giant figure of merit is discussed.In tBLG, $theta$ acts as a strong tuning parameter of both $S^g$ and $S^d$ and $PF$ in addition to $T$ and $n_s$. Our results are qualitatively compared with the measured out-of-plane thermopower in tBLG." @default.
- W3140590924 created "2021-04-13" @default.
- W3140590924 creator A5045811178 @default.
- W3140590924 date "2021-05-13" @default.
- W3140590924 modified "2023-09-25" @default.
- W3140590924 title "Giant thermopower and power factor in magic angle twisted bilayer graphene at low temperature" @default.
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- W3140590924 doi "https://doi.org/10.1088/1361-648x/abf0c2" @default.
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