Nanoscale determination of the mass enhancement factor in the lightly doped bulk insulator lead selenide

Ilija Zeljkovic; Kane L. Scipioni; Daniel Walkup; Yoshinori Okada; Wenwen Zhou; R. Sankar; Guoqing Chang; Yung Jui Wang; Hsin Lin; Arun Bansil; Fangcheng Chou; Ziqiang Wang; Vidya Madhavan

doi:10.1038/ncomms7559

Nanoscale determination of the mass enhancement factor in the lightly doped bulk insulator lead selenide

Ilija Zeljkovic, Kane L. Scipioni, Daniel Walkup, Yoshinori Okada, Wenwen Zhou, R. Sankar, Guoqing Chang, Yung Jui Wang, Hsin Lin, Arun Bansil, Fangcheng Chou, Ziqiang Wang, Vidya Madhavan

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Abstract

Bismuth chalcogenides and lead telluride/selenide alloys exhibit exceptional thermoelectric properties that could be harnessed for power generation and device applications. Since phonons play a significant role in achieving these desired properties, quantifying the interaction between phonons and electrons, which is encoded in the Eliashberg function of a material, is of immense importance. However, its precise extraction has in part been limited due to the lack of local experimental probes. Here we construct a method to directly extract the Eliashberg function using Landau level spectroscopy, and demonstrate its applicability to lightly doped thermoelectric bulk insulator PbSe. In addition to its high energy resolution only limited by thermal broadening, this novel experimental method could be used to detect variations in mass enhancement factor at the nanoscale level. This opens up a new pathway for investigating the local effects of doping and strain on the mass enhancement factor.

Original language	English (US)
Article number	6559
Journal	Nature communications
Volume	6
DOIs	https://doi.org/10.1038/ncomms7559
State	Published - Mar 2015

ASJC Scopus subject areas

General Chemistry
General Biochemistry, Genetics and Molecular Biology
General Physics and Astronomy

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10.1038/ncomms7559

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abstract = "Bismuth chalcogenides and lead telluride/selenide alloys exhibit exceptional thermoelectric properties that could be harnessed for power generation and device applications. Since phonons play a significant role in achieving these desired properties, quantifying the interaction between phonons and electrons, which is encoded in the Eliashberg function of a material, is of immense importance. However, its precise extraction has in part been limited due to the lack of local experimental probes. Here we construct a method to directly extract the Eliashberg function using Landau level spectroscopy, and demonstrate its applicability to lightly doped thermoelectric bulk insulator PbSe. In addition to its high energy resolution only limited by thermal broadening, this novel experimental method could be used to detect variations in mass enhancement factor at the nanoscale level. This opens up a new pathway for investigating the local effects of doping and strain on the mass enhancement factor.",

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AU - Zeljkovic, Ilija

AU - Scipioni, Kane L.

AU - Walkup, Daniel

AU - Okada, Yoshinori

AU - Zhou, Wenwen

AU - Sankar, R.

AU - Chang, Guoqing

AU - Wang, Yung Jui

AU - Lin, Hsin

AU - Bansil, Arun

AU - Chou, Fangcheng

AU - Wang, Ziqiang

AU - Madhavan, Vidya

PY - 2015/3

Y1 - 2015/3

N2 - Bismuth chalcogenides and lead telluride/selenide alloys exhibit exceptional thermoelectric properties that could be harnessed for power generation and device applications. Since phonons play a significant role in achieving these desired properties, quantifying the interaction between phonons and electrons, which is encoded in the Eliashberg function of a material, is of immense importance. However, its precise extraction has in part been limited due to the lack of local experimental probes. Here we construct a method to directly extract the Eliashberg function using Landau level spectroscopy, and demonstrate its applicability to lightly doped thermoelectric bulk insulator PbSe. In addition to its high energy resolution only limited by thermal broadening, this novel experimental method could be used to detect variations in mass enhancement factor at the nanoscale level. This opens up a new pathway for investigating the local effects of doping and strain on the mass enhancement factor.

AB - Bismuth chalcogenides and lead telluride/selenide alloys exhibit exceptional thermoelectric properties that could be harnessed for power generation and device applications. Since phonons play a significant role in achieving these desired properties, quantifying the interaction between phonons and electrons, which is encoded in the Eliashberg function of a material, is of immense importance. However, its precise extraction has in part been limited due to the lack of local experimental probes. Here we construct a method to directly extract the Eliashberg function using Landau level spectroscopy, and demonstrate its applicability to lightly doped thermoelectric bulk insulator PbSe. In addition to its high energy resolution only limited by thermal broadening, this novel experimental method could be used to detect variations in mass enhancement factor at the nanoscale level. This opens up a new pathway for investigating the local effects of doping and strain on the mass enhancement factor.

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Nanoscale determination of the mass enhancement factor in the lightly doped bulk insulator lead selenide

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