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Superconducting Diode Effect
Superconducting Diode Effect
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20260202105142
- ISBN
- 9798293816415
- DDC
- 530
- 저자명
- Hasan, Jaglul.
- 서명/저자
- Superconducting Diode Effect
- 발행사항
- [Sl] : The University of Wisconsin - Madison, 2026
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2026
- 형태사항
- 153 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 87-03, Section: B.
- 주기사항
- Advisor: Levchenko, Alex.
- 학위논문주기
- Thesis (Ph.D.)--The University of Wisconsin - Madison, 2026.
- 초록/해제
- 요약The first part of this thesis concerns a Josephson junction that has an anomalous current-phase relation in two-dimensional electron systems with broken inversion (I) and time-reversal(T) symmetries: the supercurrent is nonzero even when there is no phase difference between two superconductors. Details of this unusual phenomenon are examined in planar double-barrier hybrid circuit designs, where the paradigmatic Rashba-type spin-orbit coupling (SOC) is used to represent the noncentrosymmetric normal metal region. We use the microscopic Green's functions technique in the clean limit as well as the Ginzburg-Landau (GL) formalism to examine this anomalous Josephson effect. In a number of limiting cases, anomalous phase shifts in the Josephson current-phase relation are calculated in terms of the model's parameters, and the magnitude of the critical current is computed for arbitrary in-plane magnetic field orientations.In the second part of this thesis, the generalities of the superconducting diode effect (SDE) which also occurs upon simultaneous breaking of I and T symmetries have been explored. As an illustrative example, we examine a model of a two-dimensional superconductor with I−breaking Rashba-type SOC under a T −breaking in-plane magnetic field and in the clean limit, which realizes a helical phase. First, we develop a generic formula for the diode efficiency using GL phenomenology. Higher gradient terms, which cause the nonreciprocal superflow, are added to the Lifshitz invariants to accomplish this. We further estimate correction terms resulting from both intraband and interband pairing correlations and confirm these results via microscopic diagrammatic computation. We present a thorough comparison with previous studies of this problem carried out using the quasiclassical approximation based on the Eilenberger equation.Because of its possible uses in superconducting electronics, SDE has attracted a lot of interest in recent years. However, as we demonstrate in the last part of this thesis, the role of disorder scattering in SDE has seldom been taken into account, despite its potential qualitative significance. In order to get the relevant GL theory, we use a self-consistent Born approximation to study SDE in a disordered Rashba superconductor under an in-plane magnetic field. Our analysis reveals two surprising effects. First, disorder becomes the driving mechanism of SDE in the strong Rashba SOC regime, and SDE disappears in its absence. In this instance, we demonstrate that the effect is caused by disorder-induced mixing of singlet and triplet superconducting orders. Second, a sign change in the superconducting diode efficiency coefficient indicates that disorder can reverse the direction of the diode effect in the weak Rashba spin-orbit coupling (SOC) regime.
- 일반주제명
- Condensed matter physics
- 일반주제명
- Applied physics
- 일반주제명
- Physics
- 일반주제명
- Electrical engineering
- 키워드
- Josephson effect
- 키워드
- Ginzburg-Landau
- 기타저자
- The University of Wisconsin - Madison Physics
- 기본자료저록
- Dissertations Abstracts International. 87-03B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
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■00520260202105142
■006m o d
■007cr#unu||||||||
■020 ▼a9798293816415
■035 ▼a(MiAaPQ)AAI32240876
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a530
■1001 ▼aHasan, Jaglul.
■24510▼aSuperconducting Diode Effect
■260 ▼a[Sl]▼bThe University of Wisconsin - Madison▼c2026
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2026
■300 ▼a153 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 87-03, Section: B.
■500 ▼aAdvisor: Levchenko, Alex.
■5021 ▼aThesis (Ph.D.)--The University of Wisconsin - Madison, 2026.
■520 ▼aThe first part of this thesis concerns a Josephson junction that has an anomalous current-phase relation in two-dimensional electron systems with broken inversion (I) and time-reversal(T) symmetries: the supercurrent is nonzero even when there is no phase difference between two superconductors. Details of this unusual phenomenon are examined in planar double-barrier hybrid circuit designs, where the paradigmatic Rashba-type spin-orbit coupling (SOC) is used to represent the noncentrosymmetric normal metal region. We use the microscopic Green's functions technique in the clean limit as well as the Ginzburg-Landau (GL) formalism to examine this anomalous Josephson effect. In a number of limiting cases, anomalous phase shifts in the Josephson current-phase relation are calculated in terms of the model's parameters, and the magnitude of the critical current is computed for arbitrary in-plane magnetic field orientations.In the second part of this thesis, the generalities of the superconducting diode effect (SDE) which also occurs upon simultaneous breaking of I and T symmetries have been explored. As an illustrative example, we examine a model of a two-dimensional superconductor with I−breaking Rashba-type SOC under a T −breaking in-plane magnetic field and in the clean limit, which realizes a helical phase. First, we develop a generic formula for the diode efficiency using GL phenomenology. Higher gradient terms, which cause the nonreciprocal superflow, are added to the Lifshitz invariants to accomplish this. We further estimate correction terms resulting from both intraband and interband pairing correlations and confirm these results via microscopic diagrammatic computation. We present a thorough comparison with previous studies of this problem carried out using the quasiclassical approximation based on the Eilenberger equation.Because of its possible uses in superconducting electronics, SDE has attracted a lot of interest in recent years. However, as we demonstrate in the last part of this thesis, the role of disorder scattering in SDE has seldom been taken into account, despite its potential qualitative significance. In order to get the relevant GL theory, we use a self-consistent Born approximation to study SDE in a disordered Rashba superconductor under an in-plane magnetic field. Our analysis reveals two surprising effects. First, disorder becomes the driving mechanism of SDE in the strong Rashba SOC regime, and SDE disappears in its absence. In this instance, we demonstrate that the effect is caused by disorder-induced mixing of singlet and triplet superconducting orders. Second, a sign change in the superconducting diode efficiency coefficient indicates that disorder can reverse the direction of the diode effect in the weak Rashba spin-orbit coupling (SOC) regime.
■590 ▼aSchool code: 0262.
■650 4▼aCondensed matter physics
■650 4▼aApplied physics
■650 4▼aPhysics
■650 4▼aElectrical engineering
■653 ▼aJosephson effect
■653 ▼aRashba-type spin-orbit coupling
■653 ▼aSuperconductivity
■653 ▼aGinzburg-Landau
■653 ▼aSuperconducting diode effect
■690 ▼a0611
■690 ▼a0544
■690 ▼a0215
■690 ▼a0605
■71020▼aThe University of Wisconsin - Madison▼bPhysics.
■7730 ▼tDissertations Abstracts International▼g87-03B.
■790 ▼a0262
■791 ▼aPh.D.
■792 ▼a2026
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17359588▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.
