scholarly journals Quantum interference and structure-dependent orbital-filling effects on the thermoelectric properties of quantum dot molecules

2015 ◽  
Vol 17 (29) ◽  
pp. 19386-19393 ◽  
Author(s):  
Chih-Chieh Chen ◽  
David M. T. Kuo ◽  
Yia-Chung Chang
Keyword(s):  
Quantum Dot ◽  
Thermoelectric Properties ◽  
Anderson Model ◽  
Coulomb Blockade ◽  
Quantum Interference ◽  
Figure Of Merit ◽  
Quantum Dot Molecules ◽  
High Figure ◽  
Full Solution ◽  
Coulomb Blockade Regime

The quantum interference and orbital filling effects on the thermoelectric (TE) properties of quantum dot (QD) molecules with high figure of merit are illustrated via the full solution to the Hubbard–Anderson model in the Coulomb blockade regime.

Preparation and evaluation of the n-type PbTe based material properties for thermoelectric generators

2013 ◽  
Vol 1490 ◽  
pp. 179-184
Author(s):  
Tse-Hsiao Li ◽  
Jenn-Dong Hwang ◽  
Hsu-Shen Chu ◽  
Chun-Mu Chen ◽  
Chia-Chan Hsu ◽  
...  
Keyword(s):  
Elastic Modulus ◽  
Thermoelectric Properties ◽  
Figure Of Merit ◽  
High Efficiency ◽  
Waste Heat ◽  
Lead Telluride ◽  
Absolute Temperature ◽  
Factors Affecting ◽  
High Figure ◽  
General Physical

ABSTRACTOwing to energy conservation of waste heat, Lead telluride, PbTe, based materials have promising good thermoelectric properties around a range of middle temperature (Fig. 1, from 300 to 600°C), due to their high melting point, fine chemical stability, and the high figure of merit Z. The general physical properties and factors affecting the figure of merit have been reviewed. This research is focused on the n-type of PbTe materials and collocated with analysis of densities, hardness, elastic modulus, and thermoelectric properties thermoelectric figure of merit ZT=GS2T/κ (where G is electrical conductivity, S is Seebeck coefficient , T is absolute temperature, and κ is thermal conductivity). Room temperature hardness and Young’s modulus are measured by nano-indentation. In this study, the hot-press compacts under the pressure of 4 ton/cm2 can reach the maximum density about 8.2 g/cm3, and hardness and elastic modulus are 0.6 GPa and 70 GPa, respectively. The figure of merit value (ZT) of PbTe in low temperature (around 340°C) was found about 1 with carrier concentration above 1019 cm−3. These results also indicate that the powder metallurgy parameters provide potentialities for further increase of the high efficiency of energy conversion in PbTe materials.

Spin-Dependent Quantum Interference in Aharonov-Bohm Ring Embedded with Two Double-Quantum-Dot Molecules

2014 ◽  
Vol 14 (3) ◽  
pp. 2674-2678
Author(s):  
Xiaofei Wang ◽  
Xiaojie Liu ◽  
Xueyang Zhao ◽  
Haitao Yin ◽  
Weilong Wan ◽  
...  
Keyword(s):  
Quantum Dot ◽  
Quantum Interference ◽  
Double Quantum ◽  
Double Quantum Dot ◽  
Quantum Dot Molecules ◽  
Aharonov Bohm

scholarly journals Dual Negative Differential of Heat Generation in a Strongly Correlated Quantum Dot Side-Coupled to Majorana Bound States

2021 ◽  
Vol 9 ◽  
Author(s):  
Zhu-Hua Wang ◽  
Wen-Cheng Huang
Keyword(s):  
Quantum Dot ◽  
Heat Generation ◽  
Coulomb Blockade ◽  
Bound States ◽  
Interaction Strength ◽  
Local Heat ◽  
Transport Processes ◽  
Strongly Correlated ◽  
Majorana Bound States ◽  
Coulomb Blockade Regime

We study theoretically the properties of local heat originated from energy exchange between electrons passing through a quantum dot (QD) coupled to a phonon bath. The dot is sandwiched between two normal metal leads and also side-coupled to Majorana bound states (MBSs) formed at opposite ends of a topological superconductor nanowire. We find that in addition to the negative differential of heat generation (NDHG) in the Coulomb blockade regime, another NDHG emerges near the leads’ Fermi level due to the dot-MBS coupling. This dual NDHG effect is robust against the variation of intradot Coulomb interaction strength, and disappears if the QD is coupled to regular Fermions. Direct hybridization between the MBSs reduces their impacts on the electronic transport processes, and eliminates the dual NDHG effect. Our results show that the dual NDHG effect is quite efficient for inferring the existence of MBSs, and may remedy some limitations of the detection schemes relying on tunneling spectroscopy technique.

scholarly journals Enhancement in thermoelectric properties due to Ag nanoparticles incorporated in Bi2Te3 matrix

2019 ◽  
Vol 10 ◽  
pp. 634-643 ◽  
Author(s):  
Srashti Gupta ◽  
Dinesh Chandra Agarwal ◽  
Bathula Sivaiah ◽  
Sankarakumar Amrithpandian ◽  
Kandasami Asokan ◽  
...  
Keyword(s):  
Thermoelectric Properties ◽  
Power Factor ◽  
Figure Of Merit ◽  
Transmission Electron ◽  
High Power Factor ◽  
Different Temperatures ◽  
High Figure ◽  
Filtering Effect ◽  
P Type ◽  
20 Nm

The present study aims to see the enhancement in thermoelectric properties of bismuth telluride (Bi2Te3) annealed at different temperatures (573 and 773 K) through silver (Ag) nano-inclusions (0, 2, 5, 10, 15 and 20 wt %). Transmission electron microscopy (TEM) images of Ag incorporated in Bi2Te3 annealed at 573 K shows tubular, pentagonal, trigonal, circular and hexagonal nanoparticles with sizes of 6–25 nm (for 5 wt % Ag ) and 7–30 nm (for 20 wt % Ag). Ag incorporated in Bi2Te3 annealed at 773 K shows mainly hexagonally shaped structures with particle sizes of 2–20 nm and 40–80 nm (for 5 wt % Ag) and 10–60 nm (for 20 wt % Ag). Interestingly, the samples annealed at 573 K show the highest Seebeck coefficient (S, also called thermopower) at room temperature (p-type behavior) for 5% Ag which is increased ca. five-fold in comparison to Ag-free Bi2Te3, whereas for samples with the same content (5% Ag) annealed at 773 K the increment in thermopower is only about three-fold with a 6.9-fold enhancement of the power factor (S 2σ). The effect of size and shape of the nanoparticles on thermoelectric properties can be understood on the basis of a carrier-filtering effect that results in an increase in thermopower along with a control over the reduction in electrical conductivity to maintain a high power factor yielding a high figure of merit.

Electrical Pump and Probe Measurements of a Quantum Dot in the Coulomb Blockade Regime

2003 ◽  
Vol 42 (Part 1, No. 7B) ◽  
pp. 4804-4808
Author(s):  
Toshimasa Fujisawa ◽  
David Guy Austing ◽  
Yoshiro Hirayama ◽  
Seigo Tarucha
Keyword(s):  
Quantum Dot ◽  
Coulomb Blockade ◽  
Pump And Probe ◽  
Coulomb Blockade Regime ◽  
Probe Measurements
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