title: Nanoscale determination of the mass enhancement factor in the lightly doped bulk insulator lead selenide.
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.
authors: Department of Physics, Boston College, Chestnut Hill, Massachusetts 02467, USA.
authors: Ilija
authors: I
authors: Zeljkovic
authors: Department of Physics, Boston College, Chestnut Hill, Massachusetts 02467, USA.
authors: Kane L
authors: KL
authors: Scipioni
authors: Department of Physics, Boston College, Chestnut Hill, Massachusetts 02467, USA.
authors: Daniel
authors: D
authors: Walkup
authors: 1] Department of Physics, Boston College, Chestnut Hill, Massachusetts 02467, USA [2] WPI-AIMR, Tohoku University, Sendai 980-8577, Japan.
authors: Yoshinori
authors: Y
authors: Okada
authors: Department of Physics, Boston College, Chestnut Hill, Massachusetts 02467, USA.
authors: Wenwen
authors: W
authors: Zhou
authors: Center for Condensed Matter Sciences, National Taiwan University, Taipei 10617, Taiwan.
authors: R
authors: R
authors: Sankar
authors: 1] Centre for Advanced 2D Materials and Graphene Research Centre, National University of Singapore, Singapore 117546, Singapore [2] Department of Physics, National University of Singapore, Singapore 117542, Singapore.
authors: Guoqing
authors: 0000000311803127
authors: G
authors: Chang
authors: Department of Physics, Northeastern University, Boston, Massachusetts 02115, USA.
authors: Yung Jui
authors: YJ
authors: Wang
authors: 1] Centre for Advanced 2D Materials and Graphene Research Centre, National University of Singapore, Singapore 117546, Singapore [2] Department of Physics, National University of Singapore, Singapore 117542, Singapore.
authors: Hsin
authors: H
authors: Lin
authors: Department of Physics, Northeastern University, Boston, Massachusetts 02115, USA.
authors: Arun
authors: A
authors: Bansil
authors: Center for Condensed Matter Sciences, National Taiwan University, Taipei 10617, Taiwan.
authors: Fangcheng
authors: F
authors: Chou
authors: Department of Physics, Boston College, Chestnut Hill, Massachusetts 02467, USA.
authors: Ziqiang
authors: Z
authors: Wang
authors: 1] Department of Physics, Boston College, Chestnut Hill, Massachusetts 02467, USA [2] Department of Physics and Frederick Seitz Materials Research Laboratory, University of Illinois Urbana-Champaign, Urbana, Illinois 61801, USA.
authors: Vidya
authors: V
authors: Madhavan