Unconventional metallicity and giant thermopower in a strongly interacting two-dimensional electron system

Narayan, Vijay; Pepper, M.; Griffiths, Jonathan; Beere, Harvey E.; Sfigakis, F.; Jones, G. A. C.; Ritchie, D. A.; Ghosh, Arindam

doi:10.1103/physrevb.86.125406

Cited by 12 publications

(20 citation statements)

References 33 publications

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“…The interest of the Aubry phase is related to high thermodynamic properties appearing in this phase. Thus we show that one can reach in this phase the high values of Seebeck coefficient S ≈ 50k B /e ≈ 4400µV/K which approaches to the record experimental values S ≈ 400k B /e observed in quasi-one-dimensional materials [44] and with two-dimensional electron gas in small disordered samples with S ∼ 50k B /e [45]. Even more remarkable is that in this phase the figure of merit can be as such high as ZT ≈ 8 being above the record experimental values [34].…”

Section: Discussionsupporting

confidence: 81%

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Thermoelectricity of cold ions in optical lattices

Zhirov¹,

Lages²,

Shepelyansky³

2019

Eur. Phys. J. D

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We study analytically and numerically the thermoelectric properties of cold ions placed in an optical lattice. Our results show that the transition from sliding to pinned phase takes place at a certain critical amplitude of lattice potential being similar to the Aubry transition for the Frenkel-Kontorova model. We show that this critical amplitude is proportional to the cube of ion density that allows to perform experimental realization of this system at moderate lattice amplitudes. We show that the Aubry phase is characterized by the dimensionless Seebeck coefficient about 50 and the figure of merit being around 8. We propose possible experimental investigations of such system with cold ions and argue that the experiments with electrons on liquid helium surface can also help to understand its unusual properties. The obtained results represent also a challenge for modern methods of quantum chemistry and material science. arXiv:1901.09588v1 [cond-mat.quant-gas]

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Section: Discussionsupporting

confidence: 81%

“…Thus we can say that our numerical results are in a qualitative agreement with the experiments [44,45].…”

Section: Seebeck Coefficientsupporting

confidence: 86%

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Thermoelectricity of cold ions in optical lattices

Zhirov¹,

Lages²,

Shepelyansky³

2019

Eur. Phys. J. D

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“…This is in contrast to recent experimental studies of diffusion thermopower in strongly correlated systems, e.g., those displaying the fractional quantum Hall effect [28][29][30] or low-concentration samples with unconconventional metallic phases. [31][32][33] A temperature gradient can drive an electric current, or, for open electric contacts, generate an electric-voltage gradient. The strength of this thermopower is characterized by the Seebeck coefficient S = U/∆T , where U is the voltage generated by a temperature difference ∆T between two contacts.…”

Section: Introductionmentioning

confidence: 99%

Mesoscopic diffusion thermopower in two-dimensional electron gases

Rojek

König

2014

Phys. Rev. B

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The diffusion of energy that is locally deposited into two-dimensional electron gases by Joule heating generates transverse voltages across devices with broken symmetry. For mesoscopic structures characterized by device dimensions comparable to the energy diffusion length, the resulting thermopower strongly depends on details of the potential profile defined by electric gates. We discuss these mesoscopic features within a diffusion thermopower model and propose schemes to measure the energy diffusion length and its dependence on gate voltage.

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“…[3][4][5][6][7][8] While for technical applications semiconductors are so far the materials with the highest figures of merit or efficiency, there has been also much effort to examine conditions under which metals would perform optimally. Metals are typically good conductors but have usually a rather low Seebeck coefficient Q and figure of merit.…”

Section: Introductionmentioning

confidence: 99%

Thermoelectric effect of correlated metals: Band-structure effects and the breakdown of Mott's formula

Buhmann

Sigrist

2013

Phys. Rev. B

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We study the thermoelectric effect of two-dimensional metals on a square lattice within semiclassical Boltzmann transport theory with particular focus on electron-electron scattering. We compute the electrical conductivity and the Seebeck coefficient as a function of band filling and temperature for generically chosen hopping parameters in a two-dimensional tight binding model. The Boltzmann equation is solved numerically after computing the full collision integral taking the angular and radial degrees of freedom into account. These degrees of freedom of the collision integral, neglected in the standard single-relaxation-time approximation, play an important role if the transport coefficients show unconventional features. Within our detailed numerical simulation, we show that the widely used Mott formula to compute the Seebeck effect is not sufficient to describe the thermoelectric effect in the presence of strong electron-electron scattering. Furthermore, we study the Seebeck coefficient and its temperature dependence in the vicinity of a Lifshitz transition and demonstrate that it shows remarkable parallels to transport features near a quantum critical point. This paper is published as "Phys. Rev. B 88, 115128 (2013)"http://link.aps.org

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Unconventional metallicity and giant thermopower in a strongly interacting two-dimensional electron system

Cited by 12 publications

References 33 publications

Thermoelectricity of cold ions in optical lattices

Thermoelectricity of cold ions in optical lattices

Mesoscopic diffusion thermopower in two-dimensional electron gases

Thermoelectric effect of correlated metals: Band-structure effects and the breakdown of Mott's formula

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