scispace - formally typeset
Search or ask a question
Topic

Spin-½

About: Spin-½ is a research topic. Over the lifetime, 40423 publications have been published within this topic receiving 796639 citations.


Papers
More filters
Journal ArticleDOI
TL;DR: It is argued that recent neutron scattering measurements by Lake et al. of the spin excitation spectrum of La(2-delta)Sr( delta)CuO4 in a magnetic field can be understood in terms of proximity to a phase with co-existing superconductivity and spin density wave order.
Abstract: We argue that recent neutron scattering measurements by Lake et al.[Science 291, 1759 (2001)] of the spin excitation spectrum of La{sub 2-{delta} }Sr{sub {delta} }CuO{sub 4} in a magnetic field can be understood in terms of proximity to a phase with co-existing superconductivity and spin density wave order. We present a general theory for such quantum transitions, and argue that their low energy spin fluctuations are controlled by a singular correction from the superflow kinetic energy, acting in the region outside the vortex cores. We propose numerous experimental tests of our theory.

175 citations

Journal ArticleDOI
TL;DR: In this paper, the authors developed a theory of electron transport through quantum dots that are weakly coupled to ferromagnetic leads and derived generalized rate equations for the dot's occupation and accumulated spin.
Abstract: We develop a theory of electron transport through quantum dots that are weakly coupled to ferromagnetic leads. The theory covers both the linear and nonlinear transport regimes, takes noncollinear magnetization of the leads into account, and allows for an externally applied magnetic field. We derive generalized rate equations for the dot's occupation and accumulated spin and discuss the influence of the dot's spin on the transmission. A negative differential conductance and a nontrivial dependence of the conductance on the angle between the lead magnetizations are predicted.

175 citations

Journal ArticleDOI
TL;DR: In this paper, the spatial distribution of the spin current and accumulation in the multiterminal ferromagnetic/nonmagnetic hybrid structure using an approximate electrotransmission line is analyzed.
Abstract: We demonstrate the method to calculate the spatial distributions of the spin current and accumulation in the multiterminal ferromagnetic/nonmagnetic hybrid structure using an approximate electrotransmission line. The analyses based on the obtained equation yield the results, in good agreement with the experimental ones. This implies that the method allows us to determine the spin diffusion length of an additionally connected electrically floating wire from the reduction of the spin signal.

175 citations

Journal ArticleDOI
TL;DR: Comparison to numerical simulations of thermal magnonic spin currents yields qualitative agreement for the thickness dependence resulting from the finite magnon propagation length and at low temperature, even quantitative agreement with the simulations is found.
Abstract: We investigate the origin of the spin Seebeck effect in yttrium iron garnet (YIG) samples for film thicknesses from 20 nm to 50 μm at room temperature and 50 K. Our results reveal a characteristic increase of the longitudinal spin Seebeck effect amplitude with the thickness of the insulating ferrimagnetic YIG, which levels off at a critical thickness that increases with decreasing temperature. The observed behavior cannot be explained as an interface effect or by variations of the material parameters. Comparison to numerical simulations of thermal magnonic spin currents yields qualitative agreement for the thickness dependence resulting from the finite magnon propagation length. This allows us to trace the origin of the observed signals to genuine bulk magnonic spin currents due to the spin Seebeck effect ruling out an interface origin and allowing us to gauge the reach of thermally excited magnons in this system for different temperatures. At low temperature, even quantitative agreement with the simulations is found.

175 citations

Journal ArticleDOI
TL;DR: In this paper, the spin and orbital dynamics of single defects are driven by the motion of a mechanical oscillator, and prospective applications for this device, including long range, phonon-mediated spin-spin interactions, and phonon cooling in the quantum regime.
Abstract: There has been rapidly growing interest in hybrid quantum devices involving a solid-state spin and a macroscopic mechanical oscillator. Such hybrid devices create exciting opportunities to mediate interactions between disparate qubits and to explore the quantum regime of macroscopic mechanical objects. In particular, a system consisting of the nitrogen-vacancy defect center in diamond coupled to a high quality factor mechanical oscillator is an appealing candidate for such a hybrid quantum device, as it utilizes the highly coherent and versatile spin properties of the defect center. In this paper, we will review recent experimental progress on diamond-based hybrid quantum devices in which the spin and orbital dynamics of single defects are driven by the motion of a mechanical oscillator. In addition, we discuss prospective applications for this device, including long range, phonon-mediated spin-spin interactions, and phonon cooling in the quantum regime. We conclude the review by evaluating the experimental limitations of current devices and identifying alternative device architectures that may reach the strong coupling regime.

175 citations


Network Information
Related Topics (5)
Ground state
70K papers, 1.5M citations
96% related
Phase transition
82.8K papers, 1.6M citations
94% related
Quantum
60K papers, 1.2M citations
92% related
Electron
111.1K papers, 2.1M citations
91% related
Excited state
102.2K papers, 2.2M citations
91% related
Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202234
20212,352
20201,787
20191,748
20181,696
20171,621