Title: Thermoelectric transport of the half-filled lowest Landau level in a $p$ -type Ge/SiGe heterostructure

Abstract

In this work, we investigate the thermoelectric transport properties of the half-filled lowest Landau level $v=1/2$ in a gated two-dimensional hole system in a strained Ge/SiGe heterostructure. The electron-diffusion dominated regime is achieved below 600 mK, where the diffusion thermopower ${S_{xx}}^d$ at $v=1/2$ shows a linear temperature dependence. In contrast, the diffusion-dominated Nernst signal ${S_{xy}}^d$ of $v=1/2$ is found to approach zero, which is independent of the measurement configuration (sweeping magnetic field at a fixed hole density or sweeping the density by a gate at a fixed magnetic field).

Authors:

Liu, Xiaoxue ^[1]; Lu, Tzu-Ming ^[2]; Harris, Charles Thomas ^[2]; Lu, Fang-Liang ^[3]; Liu, Chia-You ^[3]; Li, Jiun-Yun ^[3]; Liu, Chee Wee ^[3]; Du, Rui-Rui ^[1]

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+ Show Author Affiliations

1. Rice Univ., Houston, TX (United States)
2. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); Sandia National Lab. (SNL-NM), Albuquerque, NM (United States). Center for Integrated Nanotechnologies (CINT)
3. National Taiwan Univ., Taipei, Taiwan (Republic of China); National Nano Device Lab., Hsinchu, Taiwan (Republic of China)

Publication Date:

Wed Feb 12 00:00:00 EST 2020

Research Org.:

Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

Sponsoring Org.:

USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF); Welch Foundation; USDOE National Nuclear Security Administration (NNSA); Ministry of Science and Technology (Taiwan); Ministry of Education (Taiwan)

OSTI Identifier:

1601273

Alternate Identifier(s):

OSTI ID: 1599513

Report Number(s):

SAND-2020-1875J
Journal ID: ISSN 2469-9950; PRBMDO; 683891; TRN: US2103623

Grant/Contract Number:  

AC04-94AL85000; DMR-1508644; C-1682; NA0003525; 106-2112-M-002-009-; 107-2218-E-002-044; 107-2622-8-002-018; NTU-CC-108L891701; NTU-07L7818; NTU-107L891702

Resource Type:

Accepted Manuscript

Journal Name:

Physical Review B

Additional Journal Information:

Journal Volume: 101; Journal Issue: 7; Journal ID: ISSN 2469-9950

Publisher:

American Physical Society (APS)

Country of Publication:

United States

Language:

English

Subject:

75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY