Fast initialization of hole spin in a quantum dot-metal surface hybrid system

Peng, Yiwei; Yu, Zhongyuan; Liu, Yumin; Wu, Tong; Zhang, Wen; Ye, Han

doi:10.1016/j.physb.2015.04.033

Cited by 5 publications

(4 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…With decreasing ∆z, the dynamics oscillates more rapidly, which is caused by the a stronger near-field confinement of the SPPs and thus a stronger QE-SPP interaction. This quick population exchange makes the hybrid system a promising platform in spin manipulation that demands a fast field response [41].…”

mentioning

confidence: 99%

Suppressed dissipation of a quantum emitter coupled to surface plasmon polaritons

Yang

2017

Phys. Rev. B

View full text Add to dashboard Cite

Enabling the confinement of light to a scale far below the one of conventional optics, surface plasmon polaritons (SPPs) induced by an electromagnetic field in a metal-dielectric interface supply an ideal system to explore strong quantized light-matter coupling. The fast matter-SPP population exchange reported in previous works makes it a candidate for spin manipulation, but such reversible dynamics asymptotically vanishes accompanying the quantum matter relaxing completely to its ground state. Here, we study the exact dissipative dynamics of a quantum emitter (QE) coupled to SPPs. It is interesting to find that, qualitatively different from conventional findings, the QE can be partially stabilized in its excited state even in the presence of the lossy metal. Our analysis reveals that it is the formation of a QE-SPP bound state which results in such suppressed dissipation. Enriching the decoherence dynamics of the QE in the lossy medium, our result is helpful to understand QE-SPP interactions and apply plasmonic nanostructures in quantum devices.Introduction.-Surface plasmon polaritons (SPPs) triggered by an electromagnetic field along a metaldielectric interface supply an ideal platform to explore strong quantized light-matter coupling [1][2][3][4][5]. Such couplings were achieved conventionally in cavity and circuit QED by boosting the interaction times, but at the price of a limited optical bandwidth and diffraction size [6][7][8][9]. Realizing strong confinement of light below the diffraction limit, SPPs have inspired great interest in studying subwavelength optics and quantum plasmonics [10,11]. Much effort has been made to realize strong or even ultrastrong coupling between SPPs and a quantum emitter (QE) made of, for example, quantum dots, quantum defects, or nitrogen vacancy centers [12][13][14]. It makes surface plasmonics a promising platform to design quantum devices [15][16][17][18], where the coupling is a prerequisite. However, the dissipation induced by the lossy metal to the QE severely limits its practical use.Owing to the strong spatial confinement of the radiation field of the QE near the metal-dielectric interface, the decoherence dynamics of the QE exhibits significant reversibility. Based on the dyadic Green's tensor formalism, the quantization of an electromagnetic field in a lossy medium was developed in Ref. [19], from which the quantized interactions between QE and SPPs can be studied. It was found that the spectral density of the SPPs approaches a Lorentzian form when the QEinterface distance is much smaller than the typical wavelength of the SPPs [20]. In this regime, the decoherence of the QE caused by the SPPs can be approximately stimulated by a Markovian one with QE coupled to an artificial pseudo damping cavity mode [21][22][23][24][25][26][27][28]. Thus one can use the well-developed tools in cavity QED to study QE-SPP interactions. Based on this method, the interplay between quenching and strong coupling of QE near a metal nanoparticle [26] and the dissipative dynamics of QE ne...

show abstract

mentioning

confidence: 99%

Suppressed dissipation of a quantum emitter coupled to surface plasmon polaritons

Yang

2017

Phys. Rev. B

View full text Add to dashboard Cite

show abstract

“…The spin-flip trion relaxation that may connect directly states |4 and |3 had a characteristic time of 1 µs [10], so it did not contribute in the system dynamics in the time scales of interest, and it was omitted. This approximation was done in all relevant studies; see, e.g., [10][11][12][13][14][15][16][17][18][19][20][21][22].…”

Section: Density Matrix Equations For the Qd Near A Mos 2 Monolayer Umentioning

confidence: 99%

“…Naturally, the QD is in an incoherent mixture state, with equal population distribution among the two spin states |1 and |2 . An important problem in this system is initialization, i.e., the creation of a particular electron spin state [10,[14][15][16][17][19][20][21][22], which can be succeeded by the optical pumping method. Specifically, a linearly polarized optical field excites resonantly the QD system and couples one of the electron spin states to a specific trion state (let us assume it couples state |1 to state |4 ).…”

Section: Introductionmentioning

confidence: 99%

“…The key to their proposal is to create an anisotropic Purcell-enhanced decay rate from the trion state to the target electron spin state by coupling the QD with a photonic structure. This idea has been explored by coupling the QD with various microphotonic and nanophotonic structures, like a semiconductor micropillar cavity, a photonic crystal nanocavity [15], a metallic prolate spheroidal nanoparticle [16], a metallic bow tie nanoantenna [17], and a planar metallo-dielectric nanostructure [19]. Recently, our group proposed the coupling of a QD in the Voigt geometry with a graphene monolayer, the basic two-dimensional material, for obtaining high fidelity electron spin initialization in short time intervals [22].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Rapid Optical Spin Initialization of a Quantum Dot in the Voigt Geometry Coupled to a Two-Dimensional Semiconductor

et al. 2020

View full text Add to dashboard Cite

We study the interaction of a quantum dot in the Voigt configuration with a laser pulse and particularly analyze the potential for rapid spin initialization by putting the quantum dot near a molybdenum disulfide (MoS 2 ) monolayer. The MoS 2 monolayer influences the spontaneous decay rates of the quantum dot, leading to anisotropically enhanced decay rates, for the quantum dot’s electric dipole moments parallel and perpendicular to the layer. By solving the relevant density matrix equations, we find that high spin initialization fidelity is obtained at short times. The fidelity is significantly higher than when the quantum dot is in free-space vacuum. We examine two different cases of the interaction of the quantum dot with the applied optical field. First, we use a continuous wave laser field and determine for various quantum dot—MoS 2 layer distances the field strength that leads to acceptable fidelity levels. The effect of the quality of the MoS 2 material on the fidelity of spin initialization is also examined. We also study the interaction of the quantum dot with a laser pulse and apply numerical optimal control to obtain the time-dependent field strength, which leads to maximum final fidelity for short time intervals. The latter approach gives beneficial results in comparison to the continuous wave field excitation.

show abstract

Analyzing role of relaxation time on second harmonic generation and optical dielectric function of impurity doped quantum dots under the aegis of noise

Arif

Bera

Ghosh

et al. 2020

Physica B: Condensed Matter

View full text Add to dashboard Cite

Fast initialization of hole spin in a quantum dot-metal surface hybrid system

Cited by 5 publications

References 26 publications

Suppressed dissipation of a quantum emitter coupled to surface plasmon polaritons

Suppressed dissipation of a quantum emitter coupled to surface plasmon polaritons

Rapid Optical Spin Initialization of a Quantum Dot in the Voigt Geometry Coupled to a Two-Dimensional Semiconductor

Analyzing role of relaxation time on second harmonic generation and optical dielectric function of impurity doped quantum dots under the aegis of noise

Contact Info

Product

Resources

About