Thermoelectric signature of the excitation spectrum of a quantum dot

Dzurak, A. S.; Smith, C. G.; Barnes, C. H. W.; Pepper, M.; Martín‐Moreno, Luis; Liang, C.-T.; Ritchie, D. A.; Jones, G. A. C.

doi:10.1103/physrevb.55.r10197

Cited by 104 publications

(112 citation statements)

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“…The sequential tunneling theory predicts a sawtooth-shaped TEP oscillation at high temperatures in a Coulomb blockade regime, 1 while co-tunneling processes are expected to suppress TEP between Coulomb blockade peaks at low temperatures. 2 These predictions have been confirmed in recent experiments of QDs fabricated in two-dimensional electron gases [3][4][5] and singlewall carbon nanotubes. 6,7 In the previous theoretical studies of TEP, only incoherent tunneling processes have been considered.…”

Section: Introductionsupporting

confidence: 65%

Thermopower of a Quantum Dot in a Coherent Regime

Nakanishi

Katô

2007

J. Phys. Soc. Jpn.

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Thermoelectric power due to coherent electron transmission through a quantum dot is theoretically studied. In addition to the known features related to resonant peaks, we show that a novel significant structure appears between the peaks. This structure arises from the so-called transmission zero, which is characteristic of coherent transmission through several quantum levels. Because of sensitivity to phase-breaking effect in quantum dots, this novel structure indicates degree of coherency in the electron transmission.

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Section: Introductionsupporting

confidence: 65%

Thermopower of a Quantum Dot in a Coherent Regime

Nakanishi

Katô

2007

J. Phys. Soc. Jpn.

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“…The second term in brackets can be understood with the aid of the Mott formula S ∝ ∂ ln G/∂E F , which is expected to hold in generic conductors at low temperature. It is a single-particle result, which is satisfied in low-dimensional systems such as quantum dots [58] and quantum point contacts [59], for which a sizable thermopower is detected only if the transmission strongly depends on energy. It is thus a pure transport contribution.…”

Section: Thermoelectric Conductancementioning

confidence: 99%

Thermoelectric effects in graphene with local spin-orbit interaction

Alomar

Sánchez

2014

Phys. Rev. B

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We investigate the transport properties of a graphene layer in the presence of Rashba spin-orbit interaction. Quite generally, spin-orbit interactions induce spin splittings and modifications of the graphene band structure. We calculate within the scattering approach the linear electric and thermoelectric responses of a clean sample when the Rashba coupling is localized around a finite region. We find that the thermoelectric conductance, unlike its electric counterpart, is quite sensitive to external modulations of the Fermi energy. Therefore, our results suggest that thermocurrent measurements may serve as a useful tool to detect nonhomogeneous spin-orbit interactions present in a graphene-based device. Furthermore, we find that the junction thermopower is largely dominated by an intrinsic term independently of the spin-orbit potential scattering. We discuss the possibility of canceling the intrinsic thermopower by resolving the Seebeck coefficient in the subband space. This causes unbalanced populations of electronic modes which can be tuned with external gate voltages or applied temperature biases.

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“…Thermoelectric properties of weakly coupled quantum dots have also been experimentally studied. [7][8][9][10] This type of device operates as a heat engine by generating electrical current and transferring heat between the same two reservoirs. A recent modification 11,12 of this scheme makes the charge and heat currents flow along different pathways by introducing a third reservoir: charge is transported between two reservoirs at the same temperature, while the third reservoir, at a different temperature, is Coulomb-coupled to the transport electrons and supplies the thermal fluctuations driving the heat engine.…”

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confidence: 99%

Theory of single-electron heat engines coupled to electromagnetic environments

Ruokola

Ojanen

2012

Phys. Rev. B

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We introduce a new class of mesoscopic heat engines consisting of a tunnel junction coupled to a linear thermal bath. Work is produced by transporting electrons up against a voltage bias like in ordinary thermoelectrics but heat is transferred by microwave photons, allowing the heat bath to be widely separated from the electron system. A simple and generic formalism capable of treating a variety of different types of junctions and environments is presented. We identify the systems and conditions required for maximal efficiency and maximal power. High efficiencies are possible with quantum dot arrays but high power can be achieved also with metallic systems.

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Thermoelectric signature of the excitation spectrum of a quantum dot

Cited by 104 publications

References 0 publications

Thermopower of a Quantum Dot in a Coherent Regime

Thermopower of a Quantum Dot in a Coherent Regime

Thermoelectric effects in graphene with local spin-orbit interaction

Theory of single-electron heat engines coupled to electromagnetic environments

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