We introduce a nonadiabatic approach to study nonlinear transport phenomena by combining quantum evolutions of superadiabatic states and semiclassical transport theories.Different from conventional adiabatic-switching...We introduce a nonadiabatic approach to study nonlinear transport phenomena by combining quantum evolutions of superadiabatic states and semiclassical transport theories.Different from conventional adiabatic-switching methods,our approach is capable of avoiding numerical divergence and unveiling underlying quantum geometric contributions simultaneously.Based on the superadiabatic approach,we find that the intrinsic nonlinear conductance is determined by the Berry connection polarizability on the Fermi surface.Incorporation of numerical results shows that our approach reproduces qualitative nonlinear transport in PT-symmetric antiferromagnets.展开更多
We present a 300 GHz photonic filter based on a soliton microcomb,addressing the increasing demand for high-frequency,low-phase-noise signals in THz-band wireless communications.Utilizing a uni-traveling-carrier photo...We present a 300 GHz photonic filter based on a soliton microcomb,addressing the increasing demand for high-frequency,low-phase-noise signals in THz-band wireless communications.Utilizing a uni-traveling-carrier photodiode(UTC-PD),our configuration enables the generation of 300 GHz waves through beat signals from adjacent longitudinal modes of the microcomb.By combining the UTC-PD with a photonic filter approach,we demonstrate that RF photonic filters with high suppression ratios are achieved in the 300 GHz band.Additionally,by mitigating the effects of higher-order dispersion,we achieve a stopband rejection exceeding 30 d B.These results underscore the potential of our photonic filter for advanced THz applications and provide a promising pathway for low-noise,high-bandwidth wireless communication systems.展开更多
基金supported by the National Natural Science Foundation of China(Grant Nos.12574212 and 12174382)the Strategic Priority Research Program of the Chinese Academy of Sciences(Grant Nos.XDB0460000 and XDB28000000)the Innovation Program for Quantum Science and Technology(Grant Nos.2024ZD0300104 and 2021ZD0302600)。
文摘We introduce a nonadiabatic approach to study nonlinear transport phenomena by combining quantum evolutions of superadiabatic states and semiclassical transport theories.Different from conventional adiabatic-switching methods,our approach is capable of avoiding numerical divergence and unveiling underlying quantum geometric contributions simultaneously.Based on the superadiabatic approach,we find that the intrinsic nonlinear conductance is determined by the Berry connection polarizability on the Fermi surface.Incorporation of numerical results shows that our approach reproduces qualitative nonlinear transport in PT-symmetric antiferromagnets.
基金Ministry of Internal Affairs and Communications,SCOPE(JP2250030)JST,CRONOS(JPMJCS24N7)Japan Society for the Promotion of Science(JP24K17624)。
文摘We present a 300 GHz photonic filter based on a soliton microcomb,addressing the increasing demand for high-frequency,low-phase-noise signals in THz-band wireless communications.Utilizing a uni-traveling-carrier photodiode(UTC-PD),our configuration enables the generation of 300 GHz waves through beat signals from adjacent longitudinal modes of the microcomb.By combining the UTC-PD with a photonic filter approach,we demonstrate that RF photonic filters with high suppression ratios are achieved in the 300 GHz band.Additionally,by mitigating the effects of higher-order dispersion,we achieve a stopband rejection exceeding 30 d B.These results underscore the potential of our photonic filter for advanced THz applications and provide a promising pathway for low-noise,high-bandwidth wireless communication systems.
