 Neža, da je Carlos, ki bilo učiniti. Vsah. Vsah si biti napočen, pa sem tento zemal. Stoj, sreči. Hvala, da sem tukaj. Zudaj sem glasba, da sem hrava pred v gayo pusteljo in kel radiatorčenom pustelji, da sem po večen, na mjelo spokoj. In je Andria Silva. To je postoč na Sissa, v komandu Andrija Vanov�o. In tudi imamo izvok, da je tvoj pravno vseh vseh počakavamo na nanoskajnosti o predhvarju taj zelo izgledanje taj, da je taj zelo za taj netelj. Taj zelo začinaj je izgledanje, kaj smo nekaj nekaj vsi familjni, da so, da smo kajni vseh, pripovajali imati taj adiziv način, nače smo počakali. In potem, da jaz nekaj neko vseh, prigrava se načštosti, In vseč, kandala in Rivlina v letu sentriju, vseč nekaj klasikovih problemovih tribovozgah vzvečenje z vrčenjem vrčenjem vzvečenjem, kako je vzvečenje na konstantno vzvečenje in vzvečenjem na vzvečenjem. Zvuk je, ki je vzvečenje, vzvečenje na vzvečenjem, kaj je in mobil, a če je zelo početil na konstantem ježenjem načinje, da je zelo početil na zelo. Kandal je zelo vzvečil, ki je zelo vzvečil vzvečil vzvečil vzvečil, ki je zelo vzvečil. Vzvečil je nanoj teknologi, početil je tudi na nanoskele in je vzvečil, da je zelo vzvečil. In vseč, kaj je vzvečil vzvečil vzvečil, V 2016 se pošli vzati nanoribon na boljne obbi. Na AFM-tipu z njih posledali začetke ribonu v nekaj postep. Zdaj sem odpovedati, da je pravda. Začeljno, nekaj je superlubrik vzati in se njih ne kajh. Na zelo prižaj je vzati v stvari, da je težko vzato, vs. ki je naskola. Tukaj tukaj je superlubrik, ki je zelo vzatve. in tukaj pomečnja je tukaj tukaj vsozno. Pomečnja je vse umeljena včasno načo vsozno. Tukaj ta skupil naspešnja in še drugi in z glasbeni vzglednih možnosti in vzgledno vzglednje, da vzgledna vzglednja vzglednja vzglednja in še drugi in še drugi. Načanje ima vzgledna in še drugi. in je tudi očem v tem, da je vseč ciljega, in da je po tebe početne, in na tem štih vseč, in da je nekaj kompensat, ki jste vseč ciljega na namoribom. In je tebe naštih, da je dinamica za vseč, in je odpravila na našem vseči našem. Če ste nekako in izgledaš, je neko mlila, ali nekako je dveči našem vseči, in nekako je tebna vseči našem, Svaj sistem vzelo, da je dynamic in tudi vzelo, nekaj multisleep, in nekaj stranje z odličenim vzelo. Vzelo je nekaj vzelo, da je tudi vzelo, vzelo je bilo obzervit kako je vzelo, na kratku grafina, na hb in na obstrat. Vzelo je tuknik, da je vzelo, da je vzelo, da je vzelo, da je vzelo, da je vzelo, makromolekulje, ki da je DNA na grafinje obzoril, in kaj sem da vzela in izgleda vzela ljudje in na nekaj zelo izgleda izgleda. Vse superlubrije pilih je vzela model in je vzela in dimensionalne modeli z GILLI. Vzela tudi tudi regime, ki je to pričel, in dovolj jazem dovolj tukaj kaj je vendak. Pozrivaj tukaj je dovolj tukaj, da je dovolj 90°, je dovolj tukaj, posrednje tukaj. Vradi je početko srednje, da je skupil, ni neč zvil strukturljiv na veliku tukaj. This simple picture was confirmed by the experiments, where they measure the derivative of the force with respect to the height, the frequency shift of the cantilever. Nisih vidjačnega vzvečna za nasenje grafinanor'i, boljč na malo zvorel. Vzvečanje, kandal njili, je kandal njili model v zelo, vse vseh izvorel, in na tudi vseh vseh vseh tudi in vseh. V tudi vseh vseh vseh tudi vseh vseh vseh, vseh vseh vseh vseh vseh vseh vseh, in vseh vseh vseh vseh vseh vseh, vseh, jaz na vseh, kar su, kaj to je vseh vseh, bo nedokrom n antioxidants in atlagesi. HI商nihatoire in nedevektivnih vrednih slonnih. Serumnes spl suggested this new regime in model in nerega sprayed what will get. One would expect, could expect some rather trivial behaviour with some force and angle in between the cases. But I should show sve en a second that is not the case, in zelo nekaj višnjih kritikalne fenomena vzb. Kako je, da je neko strane ukelej, in vzelo se v sistem. Protožitezamo, da se zelo počasno sebe, načaleli smo tzvom grafenu, kaj je vzelo, in pa je izgleda, in je dvečno, da je zelo zelo v tako zelo. Tako načal je neko korugat oblid, tako načal je nekaj energij, in začal smo vzelo s armonijneh terga, ker je neko krično, kako terga je vse ta terga, načal je vzela, tako počasno sredimo energij, which is divided in a adhesive part. A bending part describes the cost of building a bending interface, the tethering of the extension of the tail, and the intrinsic elasticity of the nano ribbon. So once we have the equation for the energy we can start by solving it numerically and see the evolution of the energy as we proceed with the peeling. So here we have the total energy of the system as a function of the peeling height normalized by the length of the nanoribbon. And we explore the behavior at different value of the tethering strength because we would like to see what's the difference with this sort of unknown parameter of the model since it's not given by the current experiments. It's instructive to decompose this energy into three contributions. So we have the addition gain due to the fact that the adherent part of the nanoribbon gains energy by interacting with the gold. And then we have the penalty due to the creation of the bending interface, of the bending angle at the interface while we peel the ribbon and the penalty from extending the tether at the tail. And it is very clear, especially looking at the bending penalty, that this peeling proceeds in two regimes. So we can divide it here for the strongest tether. A bending part, where a bending regime where like the bending energy increases, that is the dominant contribution of the peeling, which then becomes irrelevant once the tethering starts to elongate and dominates the whole process. And we enter this tether regime at a larger height. So we understand the energy economy of this system and now we can wonder if it has some effect on the structure of the peeling process. And in particular we can look at the two parameters, which are the bending angle and the force as a function of the lifting height. And we see that indeed here we still see two clear different regimes and both the bending angle and the force are not constant. In contrast with the two limiting cases of candle and jelly, but they change with the peeling. And in particular, if we focus on the steady state regime of the tether part, by ignoring the bending rigidity we can solve the model analytically and extract the coefficient for the scaling of this regime, which are reported here. And as sure we dotted lines in the plots. So we see that the bending angle scales as the height to the power of minus one-third. And opposite to this the force needed to keep peeling of the ribbon increases as the peeling proceeds with a fractional exponent of the height as well. And in particular we start to see that the detached part of the ribbon scales in a super linear fashion compared to the peeling height. And this is due to the fact that I will show you in a second. There are two different peeling fronts peaking with each other, which consumes the ribbon faster than in the limiting cases of candle and jelly. And we see also that this behavior is resilient to the value of the parameter over several order of magnitude. So it's for a harmonic tether is a general feature. Another information we can extract from this simple analytical model is the height at which this regime changes as a function of the tethering strength. By expanding in the bending regime and comparing with the tethering regime we can find that the inversion between these two regimes is a function of the peeling strength which might help understand the strength of the tethering in possible experiments. So, this is like a sort of like small nice model of this peeling, but it's still a very simplistic picture. Would be nice to check if this is actually somewhat realistic. And the first thing that we did was to perform some realistic emd simulation using lamps and some discrete force field. So we get back the real corrugation of gold and the graphene. And here you can see the peeling proceeded for a different tethering strength. We have the gilli case where the peeling is, the tail is free. So the ribbon is just consumed from the hand and it goes vertically. And as we tether the ribbon we see that both the tail and the head, the peeling front proceeds towards the center of the nano ribbon, consuming it faster and resulting in this super linear scaling of the detached part. And this effect becomes more and more strong as we increase the tether and the angle reduces and the peeling proceeds always faster. So the simulation, from this simulation we can extract the same quantity that our model predicted. And we see that the bending angle and the peeling force as a function of the peeling height do scale exactly like it is predicted by the model as this fractional exponent of the peeling height. So the critical behavior is confirmed by the simulation. And since here we reintroduz the corrugation between the gold and the nano ribbon, we see that this corrugation does not destroy the observed behavior. And the stick slip, we can observe here by comparing the blue curve and the others. The stick slip is, of course, reduced in this tether regime. Because now the ribbon is under tension, so it can deform less, so the whole peeling proceeds more smoothly. So, confirming the simulation, we can wonder like if this could be seen experimentally. And a first thing that we need to check is whether temperature changes the picture considerably. And we see that this effect should survive almost up to room temperature according to finite temperature simulation. So we see here that the zero temperature as before the critical exponent is clear. And it should survive somewhat up to room temperature between 100K and room temperature. It's still clearly observable, this scaling of the bending angle. What they usually measure in experiment is the frequency shift. And we can also see how these critical behavior should show up in this measurement. So here I'm plotting the derivative of the force with respect to the height, which is proportional to the frequency shift. And we see that compared to the superlubric tail, which is the blue curve here, in this tether regime, there is a clear peak in the beginning part of the peeling. And then the whole frequency shift should decay with the power low behavior, which becomes more and more evident as the tether becomes stronger as we can see here. So to conclude, we found that rather unexpectedly in this intermediate case there is some critical behavior of this peeling, which depends on the specific nature of the tether realizing experiment, but should be detectable also at room temperature. If there are some experiments that could be done on this, it would be nice to understand what is the real nature of the tether, if they are really harmonic, and what maybe is the effect of different edges of the nano ribbon. Because these nano ribbons can be assembled in different ways, so there might be some different slip and behavior due to the different edges. And with regard to temperature, there are two questions that will be interesting to explore. So in the large temperature limit, what is the quantitative effect of the temperature on the scaling exponent. I show you that they still survive, but they are changed when we get closer to room temperature. And on the other side at low temperature, there might be some effect due to quantized population of the phonon-flexural mode, down at very low cryogenic temperature of the system. And with this, I think I saved the coffee break, and if there are any questions. Thanks for a nice presentation. On page number nine, you have some nice cartoons or animations, I think. The next one. I wonder if the length of the ribbon is important here or not. Because on the top left, the length is finite, it seems. In the other ones, it seems infinite or periodic. No, no, no, it's finite for every system. We actually compared it at fixed length, so we compared the effect of tethering for the same length of the nano ribbon, which is somewhat similar to the one observed in the experiment. So these are all finite-size ribbon, where the tail needs to be in or free to slide a bit. But these are about 13 nanometers, which is consistent with what it's observed in experiments as well. And we checked, especially in the model, I don't think I have here in the simulation, that it doesn't depend, this whole behavior doesn't depend on the length of the nano ribbon. So it scales the same, it just takes a lot longer to reach the final point, where everything detaches. The longer the nano ribbon, the more the angle can reduce. OK, thanks. Thank you. Thanks for the talk. I was wondering, what do you put on the edges of your grafing? On the edges, everything is saturated with hydrogen. Yeah, I don't know if I have a clear picture of the nano ribbon, maybe. Yeah, everything is saturated with hydrogen. Otherwise, the force field, it's not really happy with the loose carbon on the edges. It buckles in a strange way. The experiments? The experiments are done in vacuum. So they should be saturated, consider them to be saturated with hydrogen as well. There shouldn't be any bigger molecules in there, let's say. Thank you very much. So in the beginning, when you just start pulling, you actually have a system of negative differential stiffness. So mechanics people are usually very excited about this. My question actually goes to the Basel people, have you ever seen a positive frequency shift? I mean, has the negative differential K ever been observed? Get back to the... Here basically, like this... You speak here basically. Thank you. So we do see such behavior. I mean, not this guy, not like this. I mean, we see a positive frequency shift. But the problem is that the tip is really close to the surface. So you are in a regime where you interact strongly with the surface as well. So it's difficult to come back. When you apply a spring to one end of the nano ribbon, didn't you only apply normal springs and along x-y directions, it's rigid, right? The motion is fixed in x- and y-directions. No, the springs are applied in every direction, to the center of mass of the tail of the nano ribbon. So the tail is actually allowed to move in the Z, but it's a bit tethered, because we assume that the tether would be isotropic basically, that I wouldn't be sure if it would apply only in two directions. So it's... At a pickup, yes, it's only in the Z direction. So we just lift vertically the whole system. Ah, okay. And it's fixed in x-y because the AFM tip is a lot more massive, so it shouldn't be shifted by the nano ribbon. Okay, thank you. Thanks.