Quantum oscillations and charge-neutral fermions in topological Kondo insulator YbB12 / Yuki Sato.

Format:

Book

Author/Creator:

Satō, Yūki, author.

Series:

Springer theses 2190-5061

Springer theses, 2190-5061

Language:

English

Subjects (All):

Topological insulators.

Kondo effect.

Fermions.

Genre:

Electronic books.

Physical Description:

1 online resource (xvi, 86 pages) : illustrations (some color).

Place of Publication:

Singapore : Springer, 2021.

System Details:

text file

Summary:

Electronic state of every solid is basically classified into two categories according to its electrical responses: insulator or metal. A textbook of modern solid state physics explains that shape of a Fermi surface plays a key role in most physical properties in metals. One of the well-established experimental methods to detect a Fermi surface is measurement of quantum oscillations that is a periodic response of physical quantities with respect to external magnetic fields. As insulators do not host Fermi surface, it is believed that they do not exhibit any quantum oscillations. This book presents a comprehensive review of recent observations of quantum oscillations in the Kondo insulators, SmB6 and YbB12, and discusses how the observations are demonstrated by a newly proposed mechanism where emergent charge-neutral fermions exhibit quantum oscillations instead of bare electrons. It also focuses on topological properties of Kondo insulators, and demonstrates that YbB12 hosts a surface metallic conduction owing to its non-trivial band structure. Further it presents the experiments of specific heat and thermal conductivity in YbB12 down to ultra-low temperature to discuss the possible low-energy excitations from a Fermi surface of neutral fermions. The demonstrated gapless and itinerant fermionic excitations, that is the significant contribution from charge neutral fermions, violates Wiedemann-Franz law. The discoveries point out a highly unconventional phase of quantum state--electrically insulating but thermally metallic--realized in the bulk of topological Kondo insulators.

Contents:

Introduction

Quantum Oscillations in SmB6

Unconventional Quantum Oscillations in YbB12

Charge-Neutral Fermions in YbB12

Conclusion.

Notes:

"Doctoral Thesis accepted by Kyoto University, Kyoto, Japan."

Includes bibliographical references.

Online resource; title from PDF title page (SpringerLink, viewed November 10, 2021).

ISBN:

9789811656774

9811656770

OCLC:

1284987717

Access Restriction:

Restricted for use by site license.