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Condensed matter physics
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-
- Description:
- Organic semiconductors have shown great promise for optoelectronic applications, particularly solar photovoltaics. Critical to their success is the ability to understand and manipulate the relationship between molecular structure and bulk properties. Substantial progress on understanding structural influences on electronic properties has been made for the conjugated polymers and small molecules...
- Keyword:
- Aggregation, Ultrafast Spectroscopy, PTB7, Spectroscopy, Organic Semiconductor, and Organic Photovoltaic
- Subject:
- Physical chemistry, Chemistry, and Condensed matter physics
- Creator:
- Fauvell, Thomas James
- Owner:
- Scholarly Digital Publishing
- Language:
- en
- Date Uploaded:
- 02/12/2020
- Date Created:
- 2019-01-01
- Resource Type:
- Dissertation
- Alternate Identifier:
- http://dissertations.umi.com/northwestern:14521 and etdadmin_upload_639550
-
- Description:
- In monolayer materials with a honeycomb-like lattice an emergent degree of freedom arises for charge carriers corresponding to their valley index. Due to spatial inversion asymmetry and the presence of strong spin-orbit coupling, this valley degree of freedom strongly affects the optoelectronic properties of carriers in monolayer transition metal dichalcogenides...
- Subject:
- Condensed matter physics and Low temperature physics
- Creator:
- Lenferink, Erik
- Owner:
- Scholarly Digital Publishing
- Language:
- en
- Date Uploaded:
- 02/12/2020
- Date Created:
- 2019-01-01
- Resource Type:
- Dissertation
- Alternate Identifier:
- http://dissertations.umi.com/northwestern:14827 and etdadmin_upload_686096
-
- Description:
- Liquid helium-3 is a remarkable substance. Even prior to the discovery of superfluidity in 1972, liquid helium-3 was the paradigm of a strongly interacting Fermi liquid. At even lower temperatures, liquid helium-3 undergoes a phase transition to a p-wave Fermi superfluid. Over 40 years since its discovery, superfluid helium-3 is...
- Subject:
- Condensed matter physics, Computational physics, and Statistical physics
- Creator:
- Wiman, Joshua John
- Owner:
- Scholarly Digital Publishing
- Language:
- en
- Date Uploaded:
- 02/12/2020
- Date Created:
- 2018-01-01
- Resource Type:
- Dissertation
- Alternate Identifier:
- http://dissertations.umi.com/northwestern:14399 and etdadmin_upload_616638
-
- Description:
- Transition metal oxides (TMOs) like perovskites are known to be versatile for functional properties such as ferroelectricity, magnetism, optical properties, and high-temperature superconductivity, because of their sensitive coupling between atomic structure and properties. By studying and understanding the fundamental structure-property relationships present in TMOs, it is possible to strategically engineer...
- Keyword:
- perovskites, Density functional theory, and oxygen vacancy
- Subject:
- Inorganic chemistry, Materials Science, and Condensed matter physics
- Creator:
- Shin, Yongjin
- Owner:
- Scholarly Digital Publishing
- Language:
- en
- Date Uploaded:
- 02/01/2021
- Date Created:
- 2020-01-01
- Resource Type:
- Dissertation
- Alternate Identifier:
- http://dissertations.umi.com/northwestern:15282 and etdadmin_upload_764869
-
- Description:
- Liquid 3He is the paradigm system for studying exotic quantum mechanical phenomena observed in nature. The normal state of 3He is a strongly-correlated Fermi liquid with strong ferromagnetic spin fluctuations. However, as we cool 3He down to T = 0K, we find something fascinating and unexpected. This exotic fluid remains...
- Keyword:
- Superfluidity, Helium 3, Quantized Vortex, Superconductivity, Quantum Mechanics, and Phase Transitions
- Subject:
- Theoretical physics, Condensed matter physics, and
- Creator:
- Regan, Robert Charles
- Owner:
- Scholarly Digital Publishing
- Language:
- en
- Date Uploaded:
- 02/01/2021
- Date Created:
- 2020-01-01
- Resource Type:
- Dissertation
- Alternate Identifier:
- http://dissertations.umi.com/northwestern:15410 and etdadmin_upload_780916
-
- Description:
- Superconductivity is a fascinating manifestation of quantum mechanics on a macroscopic scale that has led to greater insights of the strongly correlated physics of a large number of interacting electrons ever since its discovery $\sim$ 100 years ago in elemental Hg. The unconventional superconductors that are based on uranium offer...
- Keyword:
- Crystal Growth, Uranium Superconductors, Unconventional Superconductors, Time-Reversal Symmetry-Breaking, Superconducting Vorticies, and Ferromagnetic Superconductors
- Subject:
- Materials Science, Condensed matter physics, and Low temperature physics
- Creator:
- Avers, Keenan Edward
- Owner:
- Scholarly Digital Publishing
- Language:
- en
- Date Uploaded:
- 04/15/2021
- Date Created:
- 2021-01-01
- Resource Type:
- Dissertation
- Alternate Identifier:
- etdadmin_upload_794332 and http://dissertations.umi.com/northwestern:15459
-
- Description:
- The role of mesoscale structure on the properties of functional materials is poorly understood as the influence of mesoscale structure is both complicated and material specific. Thus there is not only a lack of a general understanding of how structure influences emergent properties but also a lack of a general...
- Subject:
- Condensed matter physics
- Creator:
- Barrows, Frank
- Owner:
- Scholarly Digital Publishing
- Language:
- en
- Date Uploaded:
- 04/15/2021
- Date Created:
- 2020-01-01
- Resource Type:
- Dissertation
- Alternate Identifier:
- etdadmin_upload_792540 and http://dissertations.umi.com/northwestern:15449
-
- Description:
- Light provides a high-speed and coherent medium for controlling quantum states. In semiconductors, coherent optical effects have been used extensively to lift spin degeneracy on ultrafast timescales and demonstrate high-fidelity control of quantum spin states. Extending this approach to novel pseudospins in monolayer transition metal dichalcogenides (TMDs), in this thesis...
- Keyword:
- Polariton, ultrafast optics, exciton, Stark effect, valley, and two-dimensional materials
- Subject:
- Optics, Applied physics, and Condensed matter physics
- Creator:
- LaMountain, Trevor
- Owner:
- Scholarly Digital Publishing
- Language:
- en
- Date Uploaded:
- 10/07/2021
- Date Created:
- 2021-01-01
- Resource Type:
- Dissertation
- Alternate Identifier:
- etdadmin_upload_838864 and http://dissertations.umi.com/northwestern:15680
-
- Description:
- Superconducting qubits are among the leading competitors in the race towards building the first full-fledged quantum computer. Using this platform, researchers have for the first time demonstrated computational capability that is beyond the reach of the current classical machines. (This achievement is nicknamed "Quantum Supremacy".) Up to date, however, the...
- Keyword:
- Superconducting Qubit, Protected Qubit, Noise Engineering, and Dynamical Sweet Spot
- Subject:
- Physics, Quantum physics, and Condensed matter physics
- Creator:
- Huang, Ziwen
- Owner:
- Scholarly Digital Publishing
- Language:
- en
- Date Uploaded:
- 10/07/2021
- Date Created:
- 2021-01-01
- Resource Type:
- Dissertation
- Alternate Identifier:
- http://dissertations.umi.com/northwestern:15760 and etdadmin_upload_845242
-
- Description:
- The highly flexible nature of 2D materials has led to them becoming fundamental building blocks for achieving novel device physics and potential breakthroughs in practical technologies. 2D layers can be interfaced in a wide array of methods with themselves, other 2D layered materials, or materials of entirely different type or...
- Keyword:
- Heterojunction, Two-Dimensional, Low-Dimensional, Exciton, Heterostructure, and Monolayer
- Subject:
- Optics, Materials Science, and Condensed matter physics
- Creator:
- Stanev, Teodor Kosev
- Owner:
- Scholarly Digital Publishing
- Language:
- en
- Date Uploaded:
- 10/07/2021
- Date Created:
- 2021-01-01
- Resource Type:
- Dissertation
- Alternate Identifier:
- http://dissertations.umi.com/northwestern:15716 and etdadmin_upload_843489
-
- Description:
- Fluctuations are ubiquitous in physics.For a system close to a phase transition, the order parameter fluctuations are strong. In this thesis we study the pair fluctuations in liquid 3He when it is close to the superfluid phase transition. Liquid 3He is a neutral Fermi liquid, which allows zero sound to...
- Keyword:
- pair fluctuations, liquid 3He, and zero sound
- Subject:
- Condensed matter physics
- Creator:
- Lin, Wei-Ting
- Owner:
- Scholarly Digital Publishing
- Language:
- en
- Date Uploaded:
- 02/02/2022
- Date Created:
- 2021-01-01
- Resource Type:
- Dissertation
- Alternate Identifier:
- etdadmin_upload_863491 and http://dissertations.umi.com/northwestern:15872
-
- Description:
- Part I - Experimental Studies of Spin Waves in a Micrometer-Thick Yttrium Iron Garnet filmAn investigation of spin wave dispersion in a micrometer-thick ferrimagnetic yttrium iron garnet (YIG) film has been conducted in various regimes. In the linear excitation regime, the dispersion of spin waves was characterized in an yttrium...
- Keyword:
- Microwave assisted reversal, Micromagnetic simulation, YIG film, FMR, Spin wave instability, and Nano-size magnet
- Subject:
- Condensed matter physics and Computational physics
- Creator:
- Lim, Jinho
- Owner:
- Scholarly Digital Publishing
- Language:
- en
- Date Uploaded:
- 02/02/2022
- Date Created:
- 2021-01-01
- Resource Type:
- Dissertation
- Alternate Identifier:
- http://dissertations.umi.com/northwestern:15798 and etdadmin_upload_851303
-
- Description:
- The cuprate superconductor HgBa$_2$CuO$_{4+\delta}$ (Hg1201) has one of the simplest physical structures of the cuprates making it an ideal candidate for nuclear magnetic resonance (NMR) measurements. Here we discuss our NMR experiments aimed at studying the mixed state of two under-doped single crystal Hg1201 samples at high magnetic fields.
- Subject:
- Condensed matter physics
- Creator:
- Stolt, Ingrid
- Owner:
- Scholarly Digital Publishing
- Language:
- en
- Date Uploaded:
- 02/02/2022
- Date Created:
- 2021-01-01
- Resource Type:
- Dissertation
- Alternate Identifier:
- etdadmin_upload_846392 and http://dissertations.umi.com/northwestern:15782
-
- Description:
- Emergent phenomena are phenomena that only arise from the bulk collective, not from individual pieces of that collective. The design of materials which host emergent phenomena can be achieved by controlling the interactions between constituent atoms, ions, or electronic spins in a material, and include materials such as permanent magnets...
- Subject:
- Inorganic chemistry and Condensed matter physics
- Creator:
- Collins, Kelsey Ann
- Owner:
- Scholarly Digital Publishing
- Language:
- en
- Date Uploaded:
- 06/22/2022
- Date Created:
- 2022-01-01
- Resource Type:
- Dissertation
- Alternate Identifier:
- etdadmin_upload_874733 and http://dissertations.umi.com/northwestern:15902
-
- Description:
- Light is a powerful tool for manipulating and probing magnetic states in solid state systems. In particular, optically-induced spin orientation, the ability to orient spin with polarized light, has been extensively utilized in low-dimensional III-V and II-VI semiconductors to pioneer spintronic research. Even though traditional semiconductors have found a wide...
- Keyword:
- Layered Semiconductors, Optical Spin Dynamics, Monochalcogenides, van der Waals Systems, and Magneto-optics
- Subject:
- Physics and Condensed matter physics
- Creator:
- Nelson, Jovan Julius
- Owner:
- Scholarly Digital Publishing
- Language:
- en
- Date Uploaded:
- 05/31/2023
- Date Created:
- 2023-01-01
- Resource Type:
- Dissertation
- Alternate Identifier:
- etdadmin_upload_982678 and http://dissertations.umi.com/northwestern:16502
-
- Description:
- The field of materials discovery is undergoing an unprecedented transition from laboratory tocomputer. Behind this transition is the new ability to accurately compute material properties, especially energetic stability, from first principles with density functional theory (DFT). However, DFT remains computationally expensive, and DFT-based materials discovery is intractable, especially in high...
- Keyword:
- High throughput, Inorganic compounds, Big data, Density functional theory, Materials discovery, and Machine learning
- Subject:
- Materials Science, Condensed matter physics, and Computational chemistry
- Creator:
- Griesemer, Sean Darius
- Owner:
- Scholarly Digital Publishing
- Language:
- en
- Date Uploaded:
- 05/31/2023
- Date Created:
- 2023-01-01
- Resource Type:
- Dissertation
- Alternate Identifier:
- http://dissertations.umi.com/northwestern:16606 and etdadmin_upload_986816
-
- Description:
- This dissertation focuses on the study of the superionic state in multicomponent systems, where the smaller component exhibits delocalization and mobility while still maintaining system compactness through component attractions. Superionic behavior is widely observed in various systems and plays a crucial role in ceramic superionic conductors, which offer high ion...
- Keyword:
- electrostatics, charge transport, sublattice melting, phase transition, superionic behaviors, and colloidal crystals
- Subject:
- Physical chemistry, Chemistry, and Condensed matter physics
- Creator:
- Lin, Yange
- Owner:
- Scholarly Digital Publishing
- Language:
- en
- Date Uploaded:
- 08/23/2023
- Date Created:
- 2023-01-01
- Resource Type:
- Dissertation
- Alternate Identifier:
- http://dissertations.umi.com/northwestern:16697 and etdadmin_upload_1009942
-
- Description:
- In recent years, the understanding and identification of quantum materials supporting non-trivial band topology has progressed rapidly. This progress has been motivated in part by the potential application of topological quantum materials in quantum computers, sensors, and other next-generation devices. Despite this progress, the computation of bulk topological invariants in...
- Keyword:
- Materials science, Topology, Condensed matter, and Quantum matter
- Subject:
- Condensed matter physics
- Creator:
- Tyner, Alexander Conkey
- Owner:
- Scholarly Digital Publishing
- Language:
- en
- Date Uploaded:
- 08/23/2023
- Date Created:
- 2023-01-01
- Resource Type:
- Dissertation
- Alternate Identifier:
- http://dissertations.umi.com/northwestern:16689 and etdadmin_upload_1009644
-
- Description:
- Necessity is the mother of innovation. In the wake of the pandemic, with no flow of samples and limited fabrication techniques available, necessity demanded a new material platform and adaptable methods to make complex oxide samples worth measuring. The material platform was KTaO3 , the younger successor to the mainstay...
- Keyword:
- Magnetism, Complex Oxide, KTaO3, Superconductivity, Electrical Transport, and Cryogenic
- Subject:
- Condensed matter physics
- Creator:
- Krantz, Patrick Wallace
- Owner:
- Scholarly Digital Publishing
- Language:
- en
- Date Uploaded:
- 08/23/2023
- Date Created:
- 2023-01-01
- Resource Type:
- Dissertation
- Alternate Identifier:
- etdadmin_upload_1009434 and http://dissertations.umi.com/northwestern:16686