Диссертация (Неравновесные эффекты и нестационарный электронный транспорт в полупроводниковых наноструктурах с межчастичным взаимодействием), страница 6

I. Arseyev.Non-stationary eects and charge trapping in the system of interactingquantum dots.16. XVII Ìåæäóíàðîäíûé ñèìïîçèóì ”Íàíîôèçèêà è Íàíîýëåêòðîíèêà”.Ìàðò 11-15, 2013, Íèæíèé Íîâãîðîä, Ðîññèÿ.V. N. Mantsevich, N. S. Maslova, P. I. Arseyev.Charge trapping in the system of coupled quantum dots with on-siteCoulomb repulsion.17.

21-é Ìåæäóíàðîäíûéòåõíîëîãèÿ”.ñèìïîçèóì”Íàíîñòðóêòóðû: Ôèçèêà èÈþíü 24-28, 2013, Ñàíêò-Ïåòåðáóðã, Ðîññèÿ.V. N. Mantsevich, N. S. Maslova, P. I. Arseyev.26Coulomb correlations inuence on the local spatial charge redistributionin a two-level system.Îñíîâíûå ðåçóëüòàòû îïóáëèêîâàíû â ñëåäóþùèõ ðàáîòàõ:1. A.I. Oreshkin, V.N. Mantsevich, N.S. Maslova, D.A. Muzychenko, S.I.Oreshkin, V.I.

Panov, S.V. Savinov, P.I. Arseev/ The inuence of dierentimpurity atoms on 1/f α tunneling current noise characteristics on InAs(110) surface // Ïèñüìà â ÆÝÒÔ. 2007. Ò.85,  11, Ñ. 4651.2. V.N. Mantsevich, N.S. Maslova/ The inuence of localized statecharging on 1/f α tunneling current noise spectrum // Solid StateCommunications. 2008. V.147, P.

278283.3. Â.Í. Ìàíöåâè÷, Í.Ñ. Ìàñëîâà, À.È. Îðåøêèí, Ñ.È. Îðåøêèí, Ä.À.Ìóçû÷åíêî, Â.È. Ïàíîâ, Ñ.Â. Ñàâèíîâ/ Âëèÿíèå ëîêàëèçîâàííûõ çàðÿäîâûõ ñîñòîÿíèé íà íèçêî÷àñòîòíóþ ñîñòàâëÿþùóþ ñïåêòðà òóííåëüíîãî òîêà âèäà (1/f α ) // Èçâåñòèÿ ÐÀÍ: ñåðèÿ ôèçè÷åñêàÿ. 2009.Ò.73,  7, Ñ.

940942.4. V.N. Mantsevich, N.S. Maslova/ Tuning of tunneling current noise spectrasingularities by localized states charging // Ïèñüìà â ÆÝÒÔ. 2009. Ò.89,1, Ñ. 2631.5. V.N. Mantsevich, N.S. Maslova/ Spatial distribution of local density ofstates in vicinity of impurity on semiconductor surface // Ïèñüìà âÆÝÒÔ.

2009. Ò.89, 12, Ñ. 713717.6. D.A. Muzychenko, S.V. Savinov, V.N. Mantsevich, N.S. Maslova, V.I.Panov, K. Schouteden, K. van Haesendonk/ Low temperature scanningtunneling microscopy and spectroscopy of spatial oscillations in thedensity of states near domain boundaries at the Ge (111) 2x1 surface// Physical Review B. 2010. V.81, P. 035313.7.

V.N. Mantsevich, N.S. Maslova/ Spatial eects of Fano resonance in localtunneling conductivity in vicinity of impurity on semiconductor surface// Ïèñüìà â ÆÝÒÔ. 2010. Ò.91, 3, Ñ. 150153.278. V.N. Mantsevich, N.S. Maslova/ Dierent behavior of local tunnelingconductivity for deep and shallow impurities due to Coulomb interaction// Solid State Communications. 2010. V.150, P. 20722075.9. V.N.

Mantsevich, N.S. Maslova/ The inuence of tunneling matrixelement modication due to on-site Coulomb interaction on localtunneling conductivity // Solid State Communications. 2011. V.151, P.659662.10. P.I. Arseyev, N.S. Maslova, V.N. Mantsevich/ Correlation inducedswitching of local spatial charge distribution in two-level system // Ïèñüìà â ÆÝÒÔ. 2011. Ò.94, 5, Ñ.

422428.11. P.I. Arseev, N.S. Maslova, V.N. Mantsevich/ The eect of Coulombcorrelations on the nonequilibrium charge redistribution tuned by atunneling current // ÆÝÒÔ. 2012. Ò.142, 1, Ñ. 156168.12. P.I. Arseev, N.S. Maslova, V.N. Mantsevich/ Non-adiabatic electroncharge pumping in coupled semiconductor quantum dots // Ïèñüìà âÆÝÒÔ.

2012. Ò.95, 10, Ñ. 589594.13. V.N. Mantsevich, N.S. Maslova, P.I. Arseyev/ Localized chargebifurcation in the coupled quantum dots // Solid State Communications.2012. V.152, P. 15451550.14. P.I. Arseyev, N.S. Maslova, V.N. Mantsevich/ Coulomb correlationseects on localized charge relaxation in the coupled quantum dots //European Physical Journal B. 2012. V.85, 7, P.

249.15. P.I. Arseyev, N.S. Maslova, V.N. Mantsevich/ Charge and spincongurations in the coupled quantum dots with Coulomb correlationsinduced by tunneling current // European Physical Journal B. 2012. V.85,12, P. 410.16. V.N. Mantsevich, N.S. Maslova, P.I. Arseyev/ Non-stationary eects inthe coupled quantum dots inuenced by the electron-phonon interaction// Ïèñüìà â ÆÝÒÔ. 2013. Ò.97, 6, Ñ. 398403.17. V.N. Mantsevich, N.S.

Maslova, P.I. Arseyev/ Charge trapping in thesystem of interacting quantum dots // Solid State Communications. 2013.V.168, P. 3641.2818. V.N. Mantsevich, N.S. Maslova, P.I. Arseev/ Non-stationary eects in thesystem of coupled quantum dots inuenced by the Coulomb correlations// ÆÝÒÔ. 2014. Ò.145, 1, Ñ. 156169.29Ãëàâà 1Ëèòåðàòóðíûé îáçîðŸ 1.1.

Íèçêî÷àñòîòíàÿ ñîñòàâëÿþùàÿ ñïåêòðàëüíîé ïëîòíîñòèòóííåëüíîãî òîêà âèäà 1/fαÍåðàâíîâåñíûå ýôôåêòû è íåñòàöèîíàðíûé ýëåêòðîííûé òðàíñïîðòâ òâåðäîòåëüíûõ íàíîñòðóêòóðàõ ÿâëÿþòñÿ îáúåêòàìè èíòåíñèâíûõ òåîðåòè÷åñêèõ è ýêñïåðèìåíòàëüíûõ èññëåäîâàíèé íà ïðîòÿæåíèè ìíîãèõ ëåò. Âïîñëåäíèå äåñÿòèëåòèÿ â ñâÿçè ñ óìåíüøåíèåì ðàçìåðîâ áàçîâûõ ýëåìåíòîâ, èñïîëüçóåìûõ â òâåðäîòåëüíîé ìèêðî- è íàíîýëåêòðîíèêå, âîçíèêëàôóíäàìåíòàëüíàÿ ïðîáëåìà âëèÿíèÿ ýëåêòðîííûõ êîððåëÿöèé è ñèëüíîãîìåæ÷àñòè÷íîãî âçàèìîäåéñòâèÿ íà ýëåêòðîííûé òðàíñïîðò â ñòðóêòóðàõñâåðõìàëûõ ðàçìåðîâ.

Çàðÿäîâûå ëîêàëèçîâàííûå ñîñòîÿíèÿ, îáðàçîâàííûå ïðèìåñíûìè àòîìàìè èëè äåôåêòàìè êðèñòàëëè÷åñêîé ðåøåòêè, çíà÷èòåëüíî âëèÿþò íà êèíåòè÷åñêèå è ñòàòèñòè÷åñêèå ñâîéñòâà òðàíñïîðòíûõ õàðàêòåðèñòèê ñèñòåì ñâåðõìàëûõ ðàçìåðîâ, à òàêæå ïðèâîäÿò ê èçìåíåíèþ èõ ñïåêòðà è ïëîòíîñòè ñîñòîÿíèé. Îñíîâíûì îáñòîÿòåëüñòâîì,âûçûâàþùèì ñëîæíîñòè ïðè àíàëèçå ñèñòåì ñ ñèëüíûìè ìåæ÷àñòè÷íûìèêîððåëÿöèÿìè, ÿâëÿåòñÿ íåïðèìåíèìîñòü òåîðèè âîçìóùåíèé, âûçâàííàÿòåì, ÷òî ñàìûì áîëüøèì ïàðàìåòðîì â ñèñòåìå ñòàíîâèòñÿ âåëè÷èíà âçàèìîäåéñòâèÿ. Ïîýòîìó ñòàíäàðòíûé ïîäõîä, ðàçâèòûé äëÿ îïèñàíèÿ ïðîöåññîâ ýëåêòðîííîãî òðàíñïîðòà â òâåðäîòåëüíûõ íàíîñòðóêòóðàõ, ñòàíîâèòñÿíåïðèìåíèìûì. íàñòîÿùåå âðåìÿ îïðåäåëÿþùàÿ ðîëü ìåæ÷àñòè÷íûõ êîððåëÿöèé âôîðìèðîâàíèè îñîáåííîñòåé ýëåêòðîííîãî òðàíñïîðòà â òâåðäîòåëüíûõ íàíîñòðóêòóðàõ øèðîêî ïîäòâåðæäåíà ýêñïåðèìåíòàëüíûìè äàííûìè, ïîëó÷åííûìè ìåòîäîì ñêàíèðóþùåé òóííåëüíîé ìèêðîñêîïèè/ñïåêòðîñêîïèè(ÑÒÌ/ÑÒÑ).

Ïðèìåíåíèå ìåòîäà ÑÒÌ/ÑÒÑ ïîçâîëÿåò ïîëó÷àòü íàèáîëååïîëíóþ èíôîðìàöèþ îá îñîáåííîñòÿõ ïðîâîäèìîñòè è èçìåíåíèÿõ íåâîçìóùåííîé ïëîòíîñòè ñîñòîÿíèé â ñòðóêòóðàõ ñâåðõìàëûõ ðàçìåðîâ, âûçâàííûõ íàëè÷èåì ìåæ÷àñòè÷íûõ êîððåëÿöèé.Ñîâðåìåííûå òåõíîëîãèè äàþò âîçìîæíîñòü êîíòðîëèðóåìûì îáðà-30çîì ñîçäàâàòü èñêóññòâåííûå ñèñòåìû íàíîìåòðîâûõ ðàçìåðîâ - êâàíòîâûå òî÷êè, íà îñíîâå êîòîðûõ ìîæíî êîíñòðóèðîâàòü ýëåêòðîííûå óñòðîéñòâà ñâåðõìàëûõ ðàçìåðîâ ñ âûñîêîé ñòåïåíüþ êîíòðîëÿ ïàðàìåòðîâ ñîçäàâàåìîé ñèñòåìû (ðàçìåð, ôîðìà, ýíåðãåòè÷åñêèé ñïåêòð). Ïîìèìî ïðîìûøëåííîãî ïðèìåíåíèÿ, êâàíòîâûå òî÷êè ÿâëÿþòñÿ óäà÷íûìè îáúåêòàìèäëÿ èññëåäîâàíèÿ òàêèõ ôóíäàìåíòàëüíûõ íàó÷íûõ ïðîáëåì êàê: ìíîãî÷àñòè÷íûå ýëåêòðîííûå êîððåëÿöèè, íåðàâíîâåñíûé ýëåêòðîííûé òðàíñïîðò,íåñòàöèîíàðíûå ðåëàêñàöèîííûå ïðîöåññû è ïðîñòðàíñòâåííîå ïåðåðàñïðåäåëåíèÿ çàðÿäà.

Êðîìå òîãî, ïðîöåññû èíòåãðàöèè ñòðóêòóð ñâåðõìàëûõðàçìåðîâ â áàçîâûå ýëåìåíòû òâåðäîòåëüíîé íàíîýëåêòðîíèêè íàïðÿìóþñâÿçàíû ñ àíàëèçîì íåðàâíîâåñíûõ è íåñòàöèîíàðíûõ ýôôåêòîâ, îáóñëîâëåííûõ ñèëüíûìè ìåæ÷àñòè÷íûìè êîððåëÿöèÿìè, îïðåäåëÿþùèõ îñîáåííîñòè ýëåêòðîííîãî òðàíñïîðòà. Äëÿ àíàëèçà îñîáåííîñòåé ýëåêòðîííîãîòðàíñïîðòà â òàêèõ ñèñòåìàõ òðåáóåòñÿ ðàçðàáîòêà îáùåé òåîðèè, ó÷èòûâàþùåé ñèëüíûå ìíîãî÷àñòè÷íûå êîððåëÿöèè è íåðàâíîâåñíóþ êèíåòèêóýëåêòðîíîâ.Îäíèì èç ôóíäàìåíòàëüíûõ îãðàíè÷åíèé, îïðåäåëÿþùèõ ïàðàìåòðûýëåêòðîííîãî òðàíñïîðòà â òâåðäîòåëüíûõ íàíîñòðóêòóðàõ ÿâëÿåòñÿ ôëèêêåð øóì [4, 5].

Ïðîãðåññ â îáëàñòè èíôîðìàöèîííûõ òåõíîëîãèé íàïðÿìóþñâÿçàí ñ óìåíüøåíèåì ðàçìåðîâ óñòðîéñòâ ìèêðî- è íàíîýëåêòðîíèêè, ïîëó÷àåìûõ íà îñíîâå ñòðóêòóð ìåòàëë-äèýëåêòðèê-ïîëóïðîâîäíèê. Óìåíüøåíèå ðàçìåðîâ áàçîâûõ ýëåìåíòîâ, íåîáõîäèìîå äëÿ óâåëè÷åíèÿ ñêîðîñòè ïåðåäà÷è è ïëîòíîñòè çàïèñè èíôîðìàöèè, îãðàíè÷åíî ðîñòîì óðîâíÿ ôëèêêåð øóìà. Âîçðàñòàíèå óðîâíÿ ôëèêêåð øóìà ïðèâîäèò ê óìåíüøåíèþ îòíîøåíèÿ ñèãíàë/øóì, ÷òî óõóäøàåò õàðàêòåðèñòèêè íå òîëüêîîáû÷íûõ òðàíçèñòîðîâ, íî è çíà÷èòåëüíî îãðàíè÷èâàåò ñâîéñòâà òàêèõ ýëåìåíòîâ êàê âèáðàòîðû, èçëó÷àòåëè, àíàëîãîâûå ïðåîáðàçîâàòåëè, ìèêðîñåíñîðû è ãåíåðàòîðû. Òèïè÷íûå òîëùèíû äèýëåêòðèêîâ, èñïîëüçóåìûõâ ñîâðåìåííûõ òðàíçèñòîðàõ, ñîñòàâëÿþò îêîëî îäíîãî íàíîìåòðà. Ïðèòàêèõ õàðàêòåðíûõ ìàñøòàáàõ íåîáõîäèìî ÷åòêî ïîíèìàòü ìèêðîñêîïè÷åñêóþ ïðèðîäó ôîðìèðîâàíèÿ ôëèêêåð øóìà è çíàòü ÿâëÿåòñÿ ëè øóìïîâåðõíîñòíûì èëè îáúåìíûì ýôôåêòîì. íàñòîÿùèé ìîìåíò, íåñìîòðÿ íà çíà÷èòåëüíîå ÷èñëî ýêñïåðèìåíòàëüíûõ è òåîðåòè÷åñêèõ ðàáîò, ïîñâÿùåííûõ èññëåäîâàíèþ ýòîãî ÿâëåíèÿ [644], ïðèðîäà øóìà ñî ñïåêòðîì 1/f α äî êîíöà íå èçó÷åíà.

Îñîáûéèíòåðåñ ïðåäñòàâëÿåò èññëåäîâàíèå ïðèðîäû ôëèêêåð øóìà â ãðàôåíå è31òîïîëîãè÷åñêèõ èçîëÿòîðàõ - ñîâðåìåííûõ ìàòåðèàëàõ, èìåþùèõ áîëüøóþïåðñïåêòèâó äëÿ ïðèìåíåíèÿ â ìèêðî- è íàíîýëåêòðîíèêå [4549]. Êðîìåòîãî, âàæíûì ÿâëÿåòñÿ âîïðîñ î ìåõàíèçìàõ âîçäåéñòâèÿ íà øóì ñî ñïåêòðîì 1/f α ñ öåëüþ åãî ïîäàâëåíèÿ [36, 38, 48].Ôëèêêåð øóì ñ ìîìåíòà îáíàðóæåíèÿ â 1922 ãîäó [4] è ïåðâûõ ïîïûòîê îáúÿñíåíèÿ ïðèðîäû âîçíèêíîâåíèÿ [5] áûë îáíàðóæåí â ñîòíÿõîáúåêòîâ ñàìîãî ðàçëè÷íîãî ïðîèñõîæäåíèÿ (ïîëóïðîâîäíèêîâûå ñîïðîòèâëåíèÿ, ñîïðîòèâëåíèÿ íà îñíîâå ìåòàëëîâ, ïîòåíöèàëû áèîëîãè÷åñêèõêëåòîê, ìàëîàìïëèòóäíûå îñöèëëÿöèè çåìíîé êîðû è ò.ä.) [5054]. òåõ íåìíîãèõ ñëó÷àÿõ, êîãäà ïðèðîäà øóìà óñòàíîâëåíà, ýòîò òèïøóìà âîçíèêàåò â ðåçóëüòàòå ñóïåðïîçèöèè øóìîâ îò îòäåëüíûõ ôëóêòóàòîðîâ ñ èçâåñòíîé ïðèðîäîé.

Îáû÷íî äëÿ îáúÿñíåíèÿ íèçêî÷àñòîòíîãîøóìà ñî ñïåêòðîì 1/f α ðàññìàòðèâàþò àíñàìáëü äâóõóðîâíåâûõ ñèñòåìñî ñëó÷àéíûì âðåìåíåì ðåëàêñàöèè τ0 , ôóíêöèÿ ðàñïðåäåëåíèÿ âåðîÿòíîñòåé êîòîðîãî èìååò âèä A/τ0α [5456]. Òîãäà ñóïåðïîçèöèÿ ëîðåíöèàíîâ,ðàñïðåäåëåííûõ ñ íàäëåæàùèì ñòàòèñòè÷åñêèì âåñîì, äàåò ñïåêòðàëüíóþïëîòíîñòü øóìà ñî ñïåêòðîì 1/f α . ðàáîòàõ [79, 57, 58] îáñóæäàþòñÿ âîïðîñû î ôèçè÷åñêèõ ÿâëåíèÿõ,âûçûâàþùèõ íèçêî÷àñòîòíûå ôëóêòóàöèè òóííåëüíîãî òîêà â êîíòàêòàõñâåðõìàëûõ ðàçìåðîâ. Àâòîðû ðàáîòû [7] â êà÷åñòâå âîçìîæíîé ïðè÷èíûôîðìèðîâàíèÿ ôëèêêåð øóìà íàçûâàþò ýôôåêò êóëîíîâñêîé áëîêàäû.

Âðàáîòå [8] ïîÿâëåíèå íèçêî÷àñòîòíûõ ôëóêòóàöèé ñâÿçûâàåòñÿ ñ ïðîöåññàìè àäñîðáöèè è äåñîðáöèè àòîìîâ íà ïîâåðõíîñòè èãëû è îáðàçöà â îáëàñòè òóííåëüíîãî êîíòàêòà.  ðàáîòå [9] íàëè÷èå øóìà òóííåëüíîãî òîêàñî ñïåêòðàëüíîé ïëîòíîñòüþ ìîùíîñòè âèäà 1/f α îáúÿñíåíî ïîâåðõíîñòíîé äèôôóçèåé àäñîðáèðîâàííûõ ìîëåêóë â îáëàñòè òóííåëüíîãî êîíòàêòà. Ïîêàçàíî, ÷òî âåëè÷èíà ïîêàçàòåëÿ ñòåïåíè α óâåëè÷èâàåòñÿ ïðè ïîíèæåíèè òåìïåðàòóðû èññëåäóåìîé òóííåëüíîé ñèñòåìû.  ðàáîòàõ [57, 58]ïîÿâëåíèå øóìà ñî ñïåêòðîì 1/f α â ìåòàëëè÷åñêèõ ïëåíêàõ ñâÿçûâàþò ñíàëè÷èåì äåôåêòîâ è èõ ìèãðàöèåé â îáðàçöàõ.Ñâîéñòâà ôëóêòóàöèé òóííåëüíîãî òîêà ïðè òóííåëèðîâàíèè ÷åðåçíóëüìåðíûå ñòðóêòóðû ïîäðîáíî èññëåäîâàíû â ðàáîòàõ [1013,15,59].