東華大學圖書館 |

Language: English

Help

回圖書館首頁

手機版館藏查詢

Back

Switch To: Labeled | MARC Mode | ISBD

Verifying and Uncovering Novel Pheno...

Hu, Jiayi,

Linked to FindBook

Google Book

Amazon

博客來

Verifying and Uncovering Novel Phenomena With Low Temperature Thermal Transport /

Record Type:	Electronic resources : Monograph/item
Title/Author:	Verifying and Uncovering Novel Phenomena With Low Temperature Thermal Transport // Jiayi Hu.
Author:	Hu, Jiayi,
Description:	1 electronic resource (137 pages)
Notes:	Source: Dissertations Abstracts International, Volume: 86-12, Section: B.
Contained By:	Dissertations Abstracts International86-12B.
Subject:	Condensed matter physics. -
Online resource:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=31842804
ISBN:	9798280747562

Verifying and Uncovering Novel Phenomena With Low Temperature Thermal Transport /
Hu, Jiayi,

Verifying and Uncovering Novel Phenomena With Low Temperature Thermal Transport /Jiayi Hu. - 1 electronic resource (137 pages)

Source: Dissertations Abstracts International, Volume: 86-12, Section: B.

The study of low-temperature thermal transport provides unique insights into quantum materials, which enables us to test hypotheses and uncover novel phenomena. In our lab, experiments are conducted in the quantum regime facilitated by high-capacity Helium-3 inserts and superconducting magnets, allowing high-resolution measurements crucial for detecting reliable thermal signals. This thesis presents the relevant projects I have primarily worked on. After briefly introducing the standard analysis for thermal transport, I will discuss experimental protocols including measurement setup, calibration, and operation of Helium-3 inserts. I will then elaborate on two materials studied in detail for their thermal conductivity and thermal Hall effects.The first material, BaCo2(AsO4)2, exhibits competing interactions and intense phonon scattering. Its structure resembles Kitaev materials with frustrated spins in layered honeycomb planes, where a 0.5 Tesla field is sufficient to disrupt long-range ordering. We observed significant spin-phonon scattering, leading to the largest field-induced thermal conductivity enhancement among insulators. Intriguingly, the thermal conductivity scales exponentially in a non-perturbative way with a single parameter, temperature-to-field ratio. Whether this behavior is unique to BaCo2(AsO4)2 or shared with other magnetically frustrated insulators is yet to be explored.The second material is the parent compound of high-Tc cuprates, La2CuO4, which has been much less studied in low-temperature regime than other cuprates. Despite reports of large thermal Hall signals, our high-resolution measurements revealed no discernible Hall effect. The observed signal is at most 1/20th of reported values and lacks the expected temperature dependence, though the thermal conductivity measured aligns with the literature.Electrical transport experiment can be easily integrated with other probes, and often complements thermal transport through offering additional insights. For ZrTe5, I investigated a resistance anomaly under hydrostatic pressure up to 3 GPa, confirming its topologically trivial origin at atmosphere and observing a potential pressure-induced surface conduction channel. In WTe2, its near electron-hole compensation renders quantum oscillations resolvable in thermal conductivity, which surprisingly differ from electrical results. These findings demonstrate electrical and thermal transport are not only individually valuable, but also collectively revealing in studies on quantum materials.

English

ISBN: 9798280747562Subjects--Topical Terms:

3173567
Condensed matter physics.
Subjects--Index Terms:

Thermal signals

Verifying and Uncovering Novel Phenomena With Low Temperature Thermal Transport /
LDR:03923nmm a22004213i 4500 001 2433788
005 20250905091014.5
006 m o d
007 cr|nu||||||||
008 261011s2025 miu||||||m |||||||eng d
020 $a 9798280747562
035 $a (MiAaPQD)AAI31842804
035 $a AAI31842804
040 $a MiAaPQD $b eng $c MiAaPQD $e rda
100 1 $a Hu, Jiayi, $e author. $0 (orcid)0000-0003-3001-8044 $3 3823539
245 1 0 $a Verifying and Uncovering Novel Phenomena With Low Temperature Thermal Transport / $c Jiayi Hu.
264 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 2025
300 $a 1 electronic resource (137 pages)
336 $a text $b txt $2 rdacontent
337 $a computer $b c $2 rdamedia
338 $a online resource $b cr $2 rdacarrier
500 $a Source: Dissertations Abstracts International, Volume: 86-12, Section: B.
500 $a Advisors: Ong, Nai Phuan Committee members: Ryu, Shinsei; Olsen, James.
502 $b Ph.D. $c Princeton University $d 2025.
520 $a The study of low-temperature thermal transport provides unique insights into quantum materials, which enables us to test hypotheses and uncover novel phenomena. In our lab, experiments are conducted in the quantum regime facilitated by high-capacity Helium-3 inserts and superconducting magnets, allowing high-resolution measurements crucial for detecting reliable thermal signals. This thesis presents the relevant projects I have primarily worked on. After briefly introducing the standard analysis for thermal transport, I will discuss experimental protocols including measurement setup, calibration, and operation of Helium-3 inserts. I will then elaborate on two materials studied in detail for their thermal conductivity and thermal Hall effects.The first material, BaCo2(AsO4)2, exhibits competing interactions and intense phonon scattering. Its structure resembles Kitaev materials with frustrated spins in layered honeycomb planes, where a 0.5 Tesla field is sufficient to disrupt long-range ordering. We observed significant spin-phonon scattering, leading to the largest field-induced thermal conductivity enhancement among insulators. Intriguingly, the thermal conductivity scales exponentially in a non-perturbative way with a single parameter, temperature-to-field ratio. Whether this behavior is unique to BaCo2(AsO4)2 or shared with other magnetically frustrated insulators is yet to be explored.The second material is the parent compound of high-Tc cuprates, La2CuO4, which has been much less studied in low-temperature regime than other cuprates. Despite reports of large thermal Hall signals, our high-resolution measurements revealed no discernible Hall effect. The observed signal is at most 1/20th of reported values and lacks the expected temperature dependence, though the thermal conductivity measured aligns with the literature.Electrical transport experiment can be easily integrated with other probes, and often complements thermal transport through offering additional insights. For ZrTe5, I investigated a resistance anomaly under hydrostatic pressure up to 3 GPa, confirming its topologically trivial origin at atmosphere and observing a potential pressure-induced surface conduction channel. In WTe2, its near electron-hole compensation renders quantum oscillations resolvable in thermal conductivity, which surprisingly differ from electrical results. These findings demonstrate electrical and thermal transport are not only individually valuable, but also collectively revealing in studies on quantum materials.
546 $a English
590 $a School code: 0181
650 4 $a Condensed matter physics. $3 3173567
650 4 $a Low temperature physics. $3 3173917
650 4 $a Materials science. $3 543314
650 4 $a Physics. $3 516296
653 $a Thermal signals
653 $a Thermal conductivity
653 $a Quantum oscillations
690 $a 0611
690 $a 0598
690 $a 0794
690 $a 0605
710 2 $a Princeton University. $b Physics. $e degree granting institution. $3 3823495
720 1 $a Ong, Nai Phuan $e degree supervisor.
773 0 $t Dissertations Abstracts International $g 86-12B.
790 $a 0181
791 $a Ph.D.
792 $a 2025
856 4 0 $u https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=31842804