Kev nce qib tau ua nyob rau hauv kev kawm ntawm Ultrafast cov lus tsa ntawm Weil QuasCusicles tswj tau los ntawmlasers
Nyob rau hauv xyoo tsis ntev los no, theoretical thiab kev sim tshawb fawb ntawm topological quantum cov ntaub ntawv tau dhau los ua cov ntsiab lus kub hauv thaj teb cov teeb meem condensed physics. Raws li lub tswv yim tshiab ntawm kev teeb meem kev faib tawm, kev txiav txim siab topological, zoo li symmetry, yog cov ntsiab lus tseem ceeb hauv cov teeb meem condensed physics. Kev nkag siab tob ntawm Topology yog cuam tshuam nrog cov teeb meem yooj yim hauv cov teeb meem condensed physics, xws li cov qauv hluav taws xob theem pib ntawmQuantum theem, Quantum Theem Kev Hloov thiab Kev Lom Zem ntawm ntau cov immobilized hauv Quantum theem. Hauv cov ntaub ntawv toxiological, txuas ntawm ntau qib kev ywj pheej, kwv yees li cov khoom siv ntawm kev ywj pheej, suab thiab kiv, lub luag haujlwm txiav txim siab hauv kev nkag siab thiab kev tswj hwm cov khoom siv. Lub teeb pom kev zoo tuaj yeem siv kom paub qhov txawv ntawm kev sib txuas lus sib txawv thiab muab cov ntaub ntawv ntawm cov khoom siv lub cev, thiab cov quantum tshiab hloov chaw, thiab cov quantum tshiab tuaj yeem tau txais. Tam sim no, kev sib raug zoo ntawm macroscopic kev coj cwj pwm ntawm cov txheej txheem teeb thiab puab lub tshuab matic thiab lawv cov khoom siv hluav taws xob tau dhau los ua lub hom phiaj tshawb fawb.
Cov lus teb cov kev coj ua ntawm cov ntaub ntawv ntawm cov tophemic yog ze rau nws cov qauv microscopic hluav taws xob. Rau kev sib tw ua ib nrab me me, cov cab kuj muaj kev nkag siab ze ntawm kev sib tshuam ntawm kev sib tshuam hlua khi yog qhov nkag siab dav rau cov kev ua haujlwm yoj ntawm cov kab ke. Kev kawm txog Nonlinear optical qhov tshwm sim hauv cov khoom siv hlau topi-cov khoom siv ntawm cov kab ke, thiab nws yuav tsum paub tias cov teebmeem no tuaj yeem siv rau kev tsim covCov khoom siv kho muag khoomThiab cov qauv tsim ntawm lub hnub ci hlwb, muab cov ntawv thov ua tau zoo yav tom ntej. Piv txwv li, hauv wyl semi-hlau, nqus lub photularly lub teeb yuav ua rau kom muaj kev txuag ntawm ob sab ntawm Wyl cones yuav yog asymmetrically faib Cov kev taw qhia ntawm lub vojrularly polarized teeb pom kev zoo, uas hu ua txoj cai chiral (daim duab 1).
Kev kawm theoretical ntawm nonlinear optical qhov tshwm sim ntawm cov ntaub ntawv topological feem ntau yog kev sib txuas ntawm cov khoom hauv av lub tswv yim thiab tsom xam cov duab. Txawm li cas los xij, cov qauv no muaj qee qhov tsis xws li: nws tsis muaj cov ntaub ntawv tiag tiag ntawm cov neeg nqa khoom thiab qhov chaw zoo, thiab nws tsis tuaj yeem tsim kev sib piv ncaj ncees nrog lub sijhawm daws teeb meem kuaj pom. Qhov txuas ntawm nruab nrab ntawm electron-phonons thiab Phoon-phonons yuav tsis raug txiav txim siab. Thiab qhov no yog qhov tseem ceeb rau tej theem hloov chaw tshwm sim. Ib qho ntxiv, kev tshawb xyuas theoretical no raws li kev ua haujlwm tsis tuaj yeem cuam tshuam nrog cov txheej txheem ntawm lub cev hauv qab. Lub sijhawm-nyob ceev kom nruj molecular dynamic (TDDCA-MD) simulation raws li thawj lub ntsiab cai tuaj yeem daws cov teeb meem saum toj no.
Tsis ntev los no, nyob rau hauv cov lus qhia ntawm Cov Tshawb Fawb Meng Sheng, Cov Kws Tshawb Fawb Kev Tshawb Fawb thiab Kws Kho Mob Hauv Tebchaws Physics, koom tes nrog Professor Hnub Jiatao ntawm lub koom haum Beijing ntawm thev naus laus zis, lawv tau siv tus kheej tsim kev zoo siab lub xeev simulation software tdap. Cov lus teb ntawm quastiparticle kev mus rau ultrafast laser nyob rau hauv qhov thib ob ntawm Wyl semi-hlau wTE2 tau tshawb nrhiav.
Nws tau pom tias tus xaiv kev zam ntawm cov neeg nqa khoom nyob ze ntawm Will SoundMet txoj cai thiab txoj kev xaiv kev hloov pauv ib txwm muaj los ntawm kev hloov pauv ntawm cov kev taw qhia polarization ntawm linearly polarized lub teeb thiab photon zog (Daim duab 2).
Lub asymmetric kev ua yeeb yam ntawm cov neeg nqa khoom photoids hauv cov lus qhia sib txawv hauv qhov chaw tiag tiag, uas cuam tshuam rau cov kev taw qhia thiab cov kev sib txuam ntawm cov nruab nrab ntawm cov kab ke. Txij li cov khoom ntawm WTE2, xws li tus naj npawb ntawm wasyl ntsiab lus nyob rau hauv qhov chaw zoo, yog heev nyob ntawm cov kab ke (Daim Duab 3), cov asymmetric tus cwj pwm yuav coj txog kev coj cwj pwm ntawm wyl quatiParticts nyob rau hauv lub zog qhov chaw thiab sib raug kev hloov pauv hauv cov khoom ntawm cov txheej txheem ntawm cov kab ke. Yog li, txoj kev tshawb no muab cov duab qhia tseeb theem rau phototopological theem hloov (Daim Duab 4).
Cov txiaj ntsig qhia tau hais tias lub chairality ntawm cov cab kuj yuav tsum tau them siab rau, thiab cov atomital cov khoom ntawm yoj muaj nuj nqi yuav tsum tau txheeb xyuas. Qhov cuam tshuam ntawm ob yog zoo sib xws tab sis cov tshuab yog pom tseeb sib txawv, uas muab kev ua kom zoo nkauj rau kev piav qhia txog cov lus ntawm wyl cov ntsiab lus. Ib qho ntxiv, txoj kev suav txoj cai txais yuav nkag siab txog cov kev coj ua nyuaj thiab kev coj ua hluav taws xob, qhia txog lawv cov cuab yeej muaj zog rau yav tom ntej rau kev tshawb fawb yav tom ntej rau yav tom ntej nonlinear optical qhov tshwm sim hauv cov ntaub ntawv topological.
Cov txiaj ntsig tau nyob hauv phau ntawv ceev xwm txheej kev sib txuas lus. Kev tshawb fawb ua haujlwm tau txais kev tshawb fawb los ntawm National Ntsiab Lus Qhia thiab Npaj Ua Si, Lub Chaw Haujlwm Pabcuam Lub Tebchaws thiab cov phiaj xwm tsav dav hlau (qeb B) ntawm Suav Academy ntawm kev kawm.
Fig.1.a. Txoj cai xaiv ib txwm xaiv rau cov ntsiab lus wyl Xaiv kev ua kom zoo nkauj vim yog atomic orbital symmetry ntawm w wyl point ntawm b. χ = + 1 hauv on-line polarized lub teeb
Daim duab. 2. Atomic qauv kos duab ntawm A, TD-WTE2; b. Band qauv nyob ze ntawm lub rooj mov fermi; (c) Cov qauv kev coj ua thiab cov txheeb ze ntawm atomic orbitals faib cov kab sib txawv, sub (1) thiab (2) thiab (2) thiab (2) thiab (2) d. Amplification ntawm Band qauv raws cov kev taw qhia GAMA
Fig.3.ab: Tus txheeb ze interleer txav ntawm linearly lub teeb kev sib tw polarized lub crystal, thiab hom kev txav mus los yog piv txwv; C. Kev sib piv ntawm cov kev sim ua haujlwm thiab sim ua kev sim; DE: Symmetry evolution ntawm cov kab ke thiab txoj haujlwm, naj npawb thiab qib kev sib cais ntawm ob qhov ze wasyl ntsiab lus hauv kz = 0 dav hlau
Daim duab. 4. Phototopological theem hloov nyob rau hauv TD-WTE2 rau linearly polarized teeb Photon Zog (?) Θ) thiab polarization theem kos duab
Sijhawm Sijhawm: Sep-25-2023