Article
Chemistry, Physical
Jiajia Chen, Kai Wu, Wei Hu, Jinlong Yang
Summary: Research shows that 2D polar perovskites have large Rashba constants and strong electric field responses, making them suitable for use in spin FETs, enabling a short spin channel length of tens of nanometers to preserve spin coherence.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2021)
Article
Materials Science, Multidisciplinary
Maryam Sabzevar, Mohammad Hossien Ehsani, Mehdi Solaimani
Summary: The study investigates the time evolution of a Gaussian wave packet in a one-dimensional semiconductor with multiple potential barriers in order to determine the spin-based transmission, reflection, and trapping coefficients. The split-step finite difference method is utilized to solve the resulting nonlinear coupled Schrodinger equations. The scattering properties of the system are analyzed in relation to the Rashba and Dresselhaus spin-orbit interactions, wave-packet velocity, barrier geometry, and number of neighboring barriers. The results demonstrate that by adjusting the Rashba and Dresselhaus coupling strengths and system characteristics, control over the spin polarization and propagation coefficients of the wave packet can be achieved.
PHILOSOPHICAL MAGAZINE
(2023)
Article
Materials Science, Multidisciplinary
Gesa-R. Siemann, Seo-Jin Kim, Edgar Abarca Morales, Philip A. E. Murgatroyd, Andela Zivanovic, Brendan Edwards, Igor Markovic, Federico Mazzola, Liam Trzaska, Oliver J. Clark, Chiara Bigi, Haijing Zhang, Barat Achinuq, Thorsten Hesjedal, Matthew D. Watson, Timur K. Kim, Peter Bencok, Gerrit van der Laan, Craig M. Polley, Mats Leandersson, Hanna Fedderwitz, Khadiza Ali, Thiagarajan Balasubramanian, Marcus Schmidt, Michael Baenitz, Helge Rosner, Phil D. C. King
Summary: By intrinsic self-doping at the CrSe2-terminated surface, a spin-polarised two-dimensional hole gas is naturally realised in AgCrSe2, offering potential for stabilising complex magnetic textures in its surface layer.
NPJ QUANTUM MATERIALS
(2023)
Article
Physics, Applied
Po-Hsin Shih, Godfrey Gumbs, Danhong Huang, Andrii Iurov, Yonatan Abranyos
Summary: This study presents a theory for investigating the transmission and reflection behavior of a two-dimensional electron gas across a planar potential step in a quantum well. The researchers found that when the energy of an incident or transmitted electron is within the Zeeman energy gap, both Klein reflection and tunneling occurs in the Rashba-Zeeman coupled electronic system.
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Chemistry, Multidisciplinary
Oliver Dowinton, Denis Maryenko, Rodion Vladimirovich Belosludov, Bohm-Jung Yang, Mohammad Saeed Bahramy
Summary: 2D phases of matter have brought a wealth of novel quantum phenomena and device applications. This study presents a non-traditional method to realize a quasi-2D electron gas in a 3D bulk oxide perovskite, with magnetically controllable topological spin textures. The anomalous Hall effect and quantum oscillations in charge conductivity and thermoelectric properties are proposed as routes to experimentally demonstrate the quasi-2D behavior.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
I. R. de Assis, R. Raimondi, G. J. Ferreira
Summary: Controlling the spin dynamics and spin lifetimes is a major challenge in spintronics. Research has shown that a persistent spin helix regime with a long lifetime can be achieved when the Rashba and Dresselhaus spin-orbit couplings are balanced. The intersubband scattering rate, controlled by electric fields and maximized for symmetric quantum wells, is a key factor in controlling spin dynamics and can lead to reduced diffusion constants and longer spin lifetimes.
Article
Materials Science, Multidisciplinary
Jun Ishihara, Takuya Suzuki, Go Kitazawa, Takachika Mori, Yuzo Ohno, Kensuke Miyajima
Summary: The spatiotemporal spin dynamics of two-dimensional electron spins in a GaAs quantum well were investigated using magneto-optical Kerr rotation measurements. The results showed that the ballistic movement of photoexcited spins resulted in a wave-packet-like motion of the spin distribution, which disappeared at higher spin densities and converged to the helical spin mode observed in the diffusive regime.
Article
Materials Science, Multidisciplinary
Sai Satyam Samal, S. Nandy, Kush Saha
Summary: The first-order moment of the Berry curvature, the Berry curvature dipole (BCD), has been found to induce nonlinear current in various materials. In certain systems, low-energy Dirac quasiparticles can lead to a non-zero BCD independent of Dirac velocity. These systems may naturally generate helicity-dependent photocurrent and a second-order thermal response.
Article
Chemistry, Multidisciplinary
Md Wazedur Rahman, Mari C. Manas-Torres, Seyedamin Firouzeh, Juan Manuel Cuerva, Luis Alvarez de Cienfuegos, Sandipan Pramanik
Summary: This study demonstrates that certain molecules can induce spin polarization in two-dimensional CNT networks, and the spin signal can survive at length scales significantly exceeding 1 µm. Using the versatility of peptide chemistry, it was shown that spin polarization depends on molecular structural features such as chirality and molecule-nanotube interactions, with both chirality-dependent and chirality-independent effects contributing to the overall spin signal. Additionally, the magnetic field dependence of the spin signals was explored, and it was found that the chirality-dependent signal exists only in certain field angles.
Article
Multidisciplinary Sciences
Sara Varotto, Annika Johansson, Boerge Goebel, Luis M. Vicente-Arche, Srijani Mallik, Julien Brehin, Raphael Salazar, Francois Bertran, Patrick Le Fevre, Nicolas Bergeal, Julien Rault, Ingrid Mertig, Manuel Bibes
Summary: Rashba interfaces have shown potential as platforms for spin-charge interconversion. We used angle resolved photoemission spectroscopy to investigate KTaO3 two-dimensional electron gases and observed their Rashba-split bands. Our calculations revealed complex spin and orbital textures, as well as interconversion efficiencies exceeding those of other oxide two-dimensional electron gases.
NATURE COMMUNICATIONS
(2022)
Article
Chemistry, Multidisciplinary
Christian M. Moehle, Chung Ting Ke, Qingzhen Wang, Candice Thomas, Di Xiao, Saurabh Karwal, Mario Lodari, Vincent van de Kerkhof, Ruben Termaat, Geoffrey C. Gardner, Giordano Scappucci, Michael J. Manfra, Srijit Goswami
Summary: Experimental results show that topological superconductivity can be engineered in semiconductors with strong spin-orbit interaction by coupling them to a superconductor. The 2D platform based on a ternary 2DEG (InSbAs) coupled to in situ grown aluminum allows for the tuning of spin-orbit coupling and the demonstration of phase-controllable Josephson junctions and superconducting islands. The clean superconductor-semiconductor interface in this system leads to a hard induced superconducting gap, providing a promising platform for studying Majorana zero modes.
Article
Materials Science, Multidisciplinary
I. A. Kokurin
Summary: Understanding the subband spectrum and wave functions of holes in III-V semiconductor nanowires is crucial for current applications. Previous studies have simplified the calculation of hole subbands, neglecting important features such as the real nanowire cross section shape and crystal orientation. In this study, these features are taken into account to calculate the subbands in GaAs nanowires. The results show that the lack of an inversion center significantly affects the subband spectrum and wave functions.
Article
Chemistry, Multidisciplinary
Michael Berger, Dominik Schulz, Jamal Berakdar
Summary: Quantum scars refer to enhanced localization of probability density of states in spectral regions with high energy levels. The study showed that spin-dependent scarring occurs in spin-coupled electronic systems, which can be detected through transport measurements or spin-polarized scanning tunneling spectroscopy.
Article
Materials Science, Multidisciplinary
Weizhen Meng, Ying Liu, Wei-Wang Yu, Xiaoming Zhang, Guodong Liu
Summary: The research discovered 27 nonmagnetic layer groups containing spin-orbit Dirac points, and identified 65 actual materials from a large 2D inorganic crystal database. Symmetry analysis classified Dirac points into two categories, with the highest order of Dirac points being linear.
MATERIALS TODAY PHYSICS
(2022)
Article
Multidisciplinary Sciences
E. Kirichenko, V. A. Stephanovich
Summary: The study found that the synergy between screening and disorder can either destroy excitons or promote the creation of bound states, with energy level crossings occurring at certain discrete values of the screening radius. These effects may be related to quantum manifestations of chaotic exciton behavior in 2D semiconductor structures.
SCIENTIFIC REPORTS
(2021)
