Pierre-Emerick Aubameyang scored twice to go with goals from Alexandre Lacazette and Lucas Toreira to earn the Gunners a famous win at the Emirates.
Their second half display has been a common theme of this new Arsenal under Emery, and he says the fans have played their part in their success.
"I think we played with our support, there was a big atmosphere, they pushed a lot for us," he said on Sky Sports.
"There were difficult moments in the first half but I think we kept calm. We spoke in the dressing room. We were having good minutes in the game but after the first half the result is not good.
"But we could continue with our work in the game and get the chances, the supporters are going to push us and in the second half we could win."
Aubameyang confident of second half turnaround
Arsenal have made a habit of saving their best for the second half this season, and Aubameyang said they had stayed confident despite trailing at half-time.
"After the first goal we conceded we had a moment where we were a bit down, but at half-time we were confident," he said on Sky Sports.
"We spoke, we knew that we can do it in the second half. With the fans, the atmosphere we felt strong and could go for the win.
"I think we can see always in the second half we played very well, we don't give up. That's the mentality."
The win lifts Arsenal above Tottenham into fourth in the table, but Aubameyang said that was not the main concern.
"The most important thing is the present right now," he said.
"We are looking of course to continue this series, we are still winning games and we're on an unbeaten run so we have to keep going."
Pochettino disappointed
Spurs boss Mauricio Pochettino called the result disappointing, and said Arsenal benefited from being able to rest players for their Europa League match in midweek.
"It was a very competitive game, very tough for us because of the fixtures," he said. "We were talking before about it being after Chelsea and Inter (Milan), so it's difficult.
"I think Arsenal competed with a lot of energy but the game was even until 2-2 in the second half.
"When we conceded the third goal it was tough for the team to come back and make the effort again. When we conceded the fourth and then of course with the sending off the game was over."
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