Pub Date : 2024-11-08DOI: 10.1103/physrevb.110.205416
V. M. Muravev, I. V. Andreev, N. D. Semenov, P. A. Gusikhin, I. V. Kukushkin
We studied the absorption of microwave electromagnetic radiation incident normal to a two-dimensional electron system on a dielectric substrate with a metallic back reflector. We have shown that the presence of a back gate strongly modifies the spectrum of plasmon polaritons in such a structure. We observe a transverse plasmon mode which starts from zero frequency at zero magnetic field and follows renormalized cyclotron resonance. This renormalization occurs from the hybridization of plasma modes with Fabry-Pérot photonic resonances in the substrate, which indicates their transverse nature. Finally, we speculate that the observed modes resemble helicon waves in three-dimensional metals.
{"title":"Absorption of electromagnetic waves in a screened two-dimensional electron system","authors":"V. M. Muravev, I. V. Andreev, N. D. Semenov, P. A. Gusikhin, I. V. Kukushkin","doi":"10.1103/physrevb.110.205416","DOIUrl":"https://doi.org/10.1103/physrevb.110.205416","url":null,"abstract":"We studied the absorption of microwave electromagnetic radiation incident normal to a two-dimensional electron system on a dielectric substrate with a metallic back reflector. We have shown that the presence of a back gate strongly modifies the spectrum of plasmon polaritons in such a structure. We observe a transverse plasmon mode which starts from zero frequency at zero magnetic field and follows renormalized cyclotron resonance. This renormalization occurs from the hybridization of plasma modes with Fabry-Pérot photonic resonances in the substrate, which indicates their transverse nature. Finally, we speculate that the observed modes resemble helicon waves in three-dimensional metals.","PeriodicalId":20082,"journal":{"name":"Physical Review B","volume":"18 1","pages":""},"PeriodicalIF":3.7,"publicationDate":"2024-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142597321","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The magnetization dynamics of two skyrmions with antiparallel vortex rotations on a nanowire substrate were investigated using micromagnetic simulations. When positioned in proximity, the skyrmions exhibit attractive interactions that decrease their separation distance. This interaction leads to a magnetic energy transition, resulting in the fusion of the two skyrmions into a single connected entity. Applying a static magnetic field aligned with the magnetization direction of the skyrmion cores causes this connected structure to expand, increasing the distance between their cores. Conversely, exposing the connected skyrmions to a specific alternating magnetic field induces resonant oscillations in the core-to-core distance, with the resonance frequency decreasing as the field amplitude increases. The effective mass of the connected skyrmions at resonance is calculated using the resonance frequency. Notably, excessively high amplitudes can cause these oscillations to converge the skyrmions excessively, leading to their annihilation. In simulations involving both static and alternating magnetic fields, separation of the connected skyrmions was not observed. These findings have potential implications for the advancement of technologies utilizing skyrmion numbers for innovative applications.
{"title":"Interconnected skyrmions in a nanowire structure: Micromagnetic simulations","authors":"Taichi Nishitani, Syuta Honda, Hiroyoshi Itoh, Tomokatsu Ohsawa, Masaaki A. Tanaka","doi":"10.1103/physrevb.110.174415","DOIUrl":"https://doi.org/10.1103/physrevb.110.174415","url":null,"abstract":"The magnetization dynamics of two skyrmions with antiparallel vortex rotations on a nanowire substrate were investigated using micromagnetic simulations. When positioned in proximity, the skyrmions exhibit attractive interactions that decrease their separation distance. This interaction leads to a magnetic energy transition, resulting in the fusion of the two skyrmions into a single connected entity. Applying a static magnetic field aligned with the magnetization direction of the skyrmion cores causes this connected structure to expand, increasing the distance between their cores. Conversely, exposing the connected skyrmions to a specific alternating magnetic field induces resonant oscillations in the core-to-core distance, with the resonance frequency decreasing as the field amplitude increases. The effective mass of the connected skyrmions at resonance is calculated using the resonance frequency. Notably, excessively high amplitudes can cause these oscillations to converge the skyrmions excessively, leading to their annihilation. In simulations involving both static and alternating magnetic fields, separation of the connected skyrmions was not observed. These findings have potential implications for the advancement of technologies utilizing skyrmion numbers for innovative applications.","PeriodicalId":20082,"journal":{"name":"Physical Review B","volume":"150 1","pages":""},"PeriodicalIF":3.7,"publicationDate":"2024-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142597315","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-08DOI: 10.1103/physrevb.110.184508
Pavel D. Kurilovich, Vladislav D. Kurilovich, Aleksandr E. Svetogorov, Wolfgang Belzig, Michel H. Devoret, Leonid I. Glazman
A mechanism to deterministically prepare a nanowire Josephson junction in an odd parity state is proposed. The mechanism involves population of two Andreev levels by a resonant microwave drive breaking a Cooper pair, and a subsequent ionization of one of the levels by the same drive. Robust preparation of the odd state is allowed by a residual Coulomb repulsion in the junction. A similar resonant process can also be used to prepare the junction in the even state. Our theory explains a recent experiment [J. J. Wesdorp et al., Phys. Rev. Lett.131, 117001 (2023)].
本文提出了一种以确定方式制备奇奇偶态纳米线约瑟夫森结的机制。该机制包括通过打破库珀对的共振微波驱动产生两个安德烈耶夫电平，以及随后通过相同的驱动使其中一个电平电离。结内残余的库仑斥力允许奇数态的稳健制备。类似的共振过程也可以用来制备偶态的结。我们的理论解释了最近的一项实验[J. J. Wesdorp 等人，Phys. Rev. Lett. 131, 117001 (2023)]。
{"title":"On-demand population of Andreev levels by their ionization in the presence of Coulomb blockade","authors":"Pavel D. Kurilovich, Vladislav D. Kurilovich, Aleksandr E. Svetogorov, Wolfgang Belzig, Michel H. Devoret, Leonid I. Glazman","doi":"10.1103/physrevb.110.184508","DOIUrl":"https://doi.org/10.1103/physrevb.110.184508","url":null,"abstract":"A mechanism to deterministically prepare a nanowire Josephson junction in an odd parity state is proposed. The mechanism involves population of two Andreev levels by a resonant microwave drive breaking a Cooper pair, and a subsequent ionization of one of the levels by the same drive. Robust preparation of the odd state is allowed by a residual Coulomb repulsion in the junction. A similar resonant process can also be used to prepare the junction in the even state. Our theory explains a recent experiment [J. J. Wesdorp <i>et al.</i>, <span>Phys. Rev. Lett.</span> <b>131</b>, 117001 (2023)].","PeriodicalId":20082,"journal":{"name":"Physical Review B","volume":"35 1","pages":""},"PeriodicalIF":3.7,"publicationDate":"2024-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142597326","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-07DOI: 10.1103/physrevb.110.205118
Jasmine K. Hinton, Daniel Schacher, Wonseok Lee, G. Alexander Smith, Emily Siska, Changyong Park, Paul B. Ellison, Scott K. Cushing, Craig P. Schwartz, Keith V. Lawler, Ashkan Salamat
An electronic topological transition (ETT) in cadmium below 1 GPa is investigated in situ with experimental x-ray absorption spectroscopy and projecting calculated core-valence excitons onto the band structure. These projections are a useful application of the Bethe-Salpeter equation approach that considers many-body effects. The method described herein can be used for systems that are otherwise difficult to probe in situ; therefore, it provides a generalizable approach to identifying and understanding ETTs under high pressure. Although pressure-induced ETTs are often probed using indirect structural responses, our own x-ray diffraction and Raman studies suggest a second-order structural transition around 3 GPa but are largely insensitive to or inconclusive for the previously studied ETT in this region.
通过实验 X 射线吸收光谱和将计算出的核价激子投射到能带结构上，对低于 1 GPa 的镉电子拓扑转变 (ETT) 进行了现场研究。这些投影是考虑多体效应的 Bethe-Salpeter 方程方法的有用应用。本文描述的方法可用于难以进行原位探测的系统；因此，它为识别和理解高压下的 ETT 提供了一种可推广的方法。虽然压力诱导的 ETT 通常使用间接结构响应进行探测，但我们自己的 X 射线衍射和拉曼研究表明，在 3 GPa 附近存在二阶结构转变，但对之前研究的该区域的 ETT 基本不敏感或没有结论。
{"title":"Electronic topological transitions in cadmium under pressure studied via theoretical and experimental x-ray absorption spectroscopy","authors":"Jasmine K. Hinton, Daniel Schacher, Wonseok Lee, G. Alexander Smith, Emily Siska, Changyong Park, Paul B. Ellison, Scott K. Cushing, Craig P. Schwartz, Keith V. Lawler, Ashkan Salamat","doi":"10.1103/physrevb.110.205118","DOIUrl":"https://doi.org/10.1103/physrevb.110.205118","url":null,"abstract":"An electronic topological transition (ETT) in cadmium below 1 GPa is investigated <i>in situ</i> with experimental x-ray absorption spectroscopy and projecting calculated core-valence excitons onto the band structure. These projections are a useful application of the Bethe-Salpeter equation approach that considers many-body effects. The method described herein can be used for systems that are otherwise difficult to probe <i>in situ</i>; therefore, it provides a generalizable approach to identifying and understanding ETTs under high pressure. Although pressure-induced ETTs are often probed using indirect structural responses, our own x-ray diffraction and Raman studies suggest a second-order structural transition around 3 GPa but are largely insensitive to or inconclusive for the previously studied ETT in this region.","PeriodicalId":20082,"journal":{"name":"Physical Review B","volume":"95 1","pages":""},"PeriodicalIF":3.7,"publicationDate":"2024-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142597402","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-07DOI: 10.1103/physrevb.110.174413
Alexey B. Ustinov, Leonid S. Vedernikov, Ivan Y. Tatsenko, Andrey A. Stashkevich
This paper reports an experimental demonstration of efficient excitation of fundamental dark spin wave solitons on a magnonic active ring below self-oscillation threshold by means of a biharmonic technique. This technique is shown to be especially appropriate for implementing multisoliton regimes otherwise unattainable. Theoretical analysis has revealed a very important role played by the phase relations between individual harmonics generated nonlinearly in the process of the formation of multiple solitons. The proposed ad hoc approach making use of the inverse Fourier transform has allowed us to elucidate the mechanisms underlying the formation of investigated nonlinear waveforms from their power spectra.
{"title":"Excitation of fundamental multiple dark solitons from forced biharmonic oscillations in a magnonic active ring","authors":"Alexey B. Ustinov, Leonid S. Vedernikov, Ivan Y. Tatsenko, Andrey A. Stashkevich","doi":"10.1103/physrevb.110.174413","DOIUrl":"https://doi.org/10.1103/physrevb.110.174413","url":null,"abstract":"This paper reports an experimental demonstration of efficient excitation of fundamental dark spin wave solitons on a magnonic active ring below self-oscillation threshold by means of a biharmonic technique. This technique is shown to be especially appropriate for implementing multisoliton regimes otherwise unattainable. Theoretical analysis has revealed a very important role played by the phase relations between individual harmonics generated nonlinearly in the process of the formation of multiple solitons. The proposed <i>ad hoc</i> approach making use of the inverse Fourier transform has allowed us to elucidate the mechanisms underlying the formation of investigated nonlinear waveforms from their power spectra.","PeriodicalId":20082,"journal":{"name":"Physical Review B","volume":"37 1","pages":""},"PeriodicalIF":3.7,"publicationDate":"2024-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142597339","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：